Random chemistry FINAL

Welcome to your Random chemistry FINAL

188. What are the possible oxidation states of sulphur:

(C) -5, -3, -1, 0, +2

(B) 0, +1, +3, +5

(D) -5, -3, 0, +3, +5

(A) -2, 0, +2, +4, +6

117. Is it possible to find the enthalpy of CO(g) from the reaction, if we know:

\[CO_2(g)+H_2(g) -> CO(g)+H_2O(g)+ΔH_f\]

(C) Molar enthalpy Molar enthalpy \[CO_2(s)\, and \,H_2O(g)\]

(A) Molar enthalpy \[H2O(g) H_2(g)\, and \,ΔH_f\]

(B) Molar enthalpy \[O_2(g) H_2(I), CO_2(g)\,and \,ΔH_f\]

(D) there re not correct answer

173. The hybridization of the central carbon atom in an aldehyde is _________.

(B) \[sp^3\]

(A) \[sp\]

(D) \[D^2sp^3\]

(C) \[sp^2\]

151. Which one correctly depicts a primary amine?

(D)

(A)

(B)

(C)

212. Which reactionis NOT possible with acetic acid?

(C) \[CH_3COOH + Na_2CO_3→\]

(A) \[CH_3COOH + NaOH→\]

(B) \[CH_3COOH + NaCl→\]

\[CH_3COOH + NH_3→\]

163. C3H8O has

(A) three isomers

(C) two isomers

(D) only one isomer

(B) four isomers

242. \[CH_3-CH_2-C(=O)NH_2\] is called a(n)_______________________

(A) amine

(C) ketone

(D) aldehyde

(B) amide

205. Which one of the following ions has the electron configuration

\[[Ar]3d^4?\]

(B) \[Cr^{2+}\]

(C) \[Fe^{3+}\]

(A)\[Mn^{2+}\]

(D) \[Co{3+}\]

222. What is the major functional group in the following compound?

(C) amine

(A) ketone

(B) ester

(D) amide

200. Select the formula of potassium dichromate:

(B) \[KCr_2O_7\]

(D) \[K2Cr_2O_4\]

(C) \[KCr_2O_5\]

(A) \[K_2Cr_2O_7\]

194. The equilibrium constant:

(B) depend on changes in reactant concentrations

(D) there is no correct answer

(A) can be changed at constant temperature

(C) depend on changes in product concentrations

128. \[CH_3-CH_2-C(=O)NH_2\] is called a(n)___________

(D) aldehyde

(C) ketone

(B) amide

(A) amine

159. In the reaction below, what atoms or ions are being oxidized and reduced, respectively.

\[HNO_2 +\,→\,NO + I3 -\]

(C) N, I-

(B) I-, N

(A) O, I

(D) N, O

140. _________________ is a disaccharide

(D) ribose

(A) glucose

(C) sucrose

(B) galactose

167. During an exothermic reaction the compounds with less energy are:

(C) reaction products

(B) reactants, if they are in gas state

(D) there is no correct answer

(A) reactants

146. At equilibrium, concentration is of reactants:

(B) are lowest

(D) are variable

(A) are highest

(C) are constant

134. The principal difference between fructose ans glucose is that__________

(C) fructose is a monosaccharide and glucose is polysaccharide

(B) fructose is a monosaccharide and glucose is a disaccaride

(D) fructose is a ketone sugar and glucose is an aldehyde sugar

(A) fructose is a disaccharide and glucose is a monosacharide

209. Which compound undergoes the substitution reaction with NaCN?

(A) \[CH_3(CH_2)_3C_{|_{Cl}}=CH_2\]

(B) \[CH_3(CH_2)_3CH_2CH_2Br\]

(D) \[CH_3(CH_2)_3CH=CHCl\]

(C) \[CH_3(CH_2)_3CH=CBr_2\]

136. I, 2-dichlorethene has

(B) cis-trans isomers

(C) chain isomers

(A) no isomers

(D) positional isomers

204. What is the IUPAC name of the compound shown:

(A) 2,2-dimethyl-4-butanol

(D) 2-isohexanol

(B) 4-methyl-2-pentanol

(C) 2-methyl-4-pentanol

176. The following reaction would produce a(n) _______.

R-OH + RCOOH ->

(D) ester

(A) ketone

(B) ether

(C) aldehyde

202. In a redox reaction, there must be:

(A) An oxidizing agent and no reducing agent

(D) No reducing or oxidizing agent

(C) A reducing agent and an oxidizing agent

(B) A reducing agent and no oxidizing agent

195. The electrons in the first electron shell have:

(B) have no energy

(C) the same amount of energy as electrons in the highest electron shell

(A) the lowest energy in the atom

(D) the same amount of energy as the protons

153. Which type of organic compound does not contain a carbonyl group?

(D) aldehydes

(A) alcohol

(B) asters

(C) ketones

225. The name for the compound with the formula

\[CH_3CH_2CH_2CH_2OH\] is

(A) propanol

(B) propane

(C) butanol

(D) pentanol

189. During an endothermic reaction:

(D) there is no correct answer

(A) there is no energy exchange

(B) certain amount of heat is absorbed into the system

(C) certain amount of heat is released from the system

239. Electron configuration of phosphorus is:

(C) \[1s^2s^22p^63s^23p^13d^2\]

(D) \[1s^2s^22p^63s^13p^23d^2\]

(B) \[1s^2s^22p^63s^23p^23d^1\]

(A) \[1s^2s^22p^63s^23p^3\]

241. If the temperature of a chemical reaction is increased, then the equlibrium constant:

(C) sometimes changes

(D) there is no correct answer

(A) always changes

(B) never changes

244. 1, 2-dichlorethene has

(B) cis-trans isomers

(C) chain isomers

(A) no isomers

(D) positional isomers

183. For which of the compounds below are cis-trans isomers possible:

(A) 1 and 3

(B) 2 and 3

(C) 2

(D) 3

150. The heat of formation of pure carbon in diffwrent allotropic forms:

(B) is always negative

(D) is always zero

(A) depends on the allotropic form

(C) is always positive

201. What are the products of reaction Zn + CuSO4→ :

(A) Zinc sulfate and copper

(D) Zinc oxide, copper oxide and oxygen

(B) Zinc oxide and copper oxide

(C) Zinc oxide, copper oxide and sulfur dioxide

181. Which of the following is alkane:

(A) \[C_6H_{14}\]

(D) \[C_5H_{10}\]

(B) \[C_6H_{12}\]

(C) \[C-6H_{10}\]

149. During an endothermic reaction the compounds with less energy are:

(A) reactants

(B) reaction products

(C) reactant, if they are in gas state

(D) there is not correct answer

232. The oxidation number of C in

\[H_2C_2O_4\] is?

(A) +3

(B) +2

(C) +4

(D) -2

206. The net ionic equation for the hydrolysis of the salt

\[Na_2S\] is

(D) \[2 Na^++S^{2-}+2H_2O⇄ 2Na^++2OH^-+H_2S\]

(A) \[Na_2 ⇄ 2 Na^++S^{2-}\]

(B) \[S^{2-}+H_2O⇄OH^-+ HS^+\]

(C) \[Na_2S+2H_2O⇄2NaOH+H_2S\]

154. Select the monosaccharide (s).

(C) glucose

(D) fructose and glucose

(A) sucrose

(B) fructose

174. The secondary structure of a protein is the result of _______ bonding.

(B) peptide

(A) covalent

(C) ionic

(D) hydrogen

213. Peptide bonds can be classified as:

(A) Amines

(B) Carboxylic acids

(D) Esters

(C) Amides

203. What is the name of the compound below:

(B) 2,5-dimethylpentane

(C) 2,4-dimethyl-1-pentene

(A) 2,4-methylbutene

(D) 2,4-dimethyl-4-pentene

178. Which one of the following compounds is an isomer of :

\[CH_3CH_2CH_2CH_2OH\]

(D)

(A)

(B)

(C)

215. Which of the following compound is NOT a monosaccharide?

(C) D-Mannose

(A) D-Sucrose

(B) D-Glucose

(D) D-Ribose

245. Which of the following compounds does not contain a - C=O bond?

(C) ethers

(D) amides

(A) ketones

(B) maltose

198. which bands are formed by a carbon atom with sp2 hybridization?

(A) 4π-bonds

(B) 4π-bonds and 2σ-bonds

(D) 4σ-bonds

(C) 1π-bonds and 3σ-bonds

197. The nucleus of an atom:

(C) has positive electric charge

(D) does not contain neutrons

(B) contains electrons

(A) is neutral

138. Which of the following is classified as an aldehyde?

(B) phenol

(C) methanal

(D) glycerine

(A) methanone

164. In which compound there is ionic chemical bond:

(A) NO2

(C) KS

(D) H2S

(B) HNO3

123. Select the monosaccharide (s).

(C) glucose

(D) fructose and glucose

(B) fructose

(A) sucrose

218. Which of the following is the product of the reaction of butanal with H2/Pt:

(D) Butan-2-ol

(B) Butan-1-ol

(C) Butan-2-one

(A) Butanoic acid

193. The equilibrium constant:

(A) can be changed at constant temperature

(C) depend on changes in product concentrations

(B) depend on changes in reactant concentrations

(D) there is no correct answer

147. The rate of a chemical reaction decreases if:

(C) The temperature is decreased

(A) the activation energy is decreased

(D) some of the reaction products are gases

(B) the atmospheric pressure is kept constant

168. If the activation energy is decreased, the reaction rate:

(D) increases or decreases depending on the different reactant type

(B) always increases

(A) does not change

(C) always decreases

132. Noble metals

(D) do not react with air and water

(C) react with air but not react with water

(B) do not react with air

(A) react with air

219. Soaps are:

I. lond-chain esters
II. Long-chain fatty acids
III. Sodium salts of long-chain carboxylic acids
IV. Both polar and nonpolar molecules

(D) III and IV

(C) I, II and III

(B) II and IV

(A) I and IV

172. The compound below is a(n) __________.

(D) Ester

(A) Carboxylic acid

(C) Aldehyde

(B) Ketone

160. Which of the statements are true?

I Metals have high melting and boiling points

II Metals have low boiling point

III Metals are good conductors of heat and electricity

IV Metal do not react with oxygen

(B) I and III

(C) I and IV

(D) II and IV

(A) II and IV

119. Which of these statements describes a condensation reaction?

(A) addition of H2O to a double bond

(C) oxidation of ethanol to acetaldehyde

(B) linking an acid and an alcohol to make an ester and water

(D) hydrolysis of an ester

145. If the concentration of a reactant is increase at constant temperature, then the equilibrium constant:

(D) does not change

(B) always decreases

(A) always increases

(C) sometimes increases

230. What is the next step in balancing the half reaction:

\[Cr_2O_7{^{2-}} → 2Cr^{3+}\] ?

(B) add 7 H2O to the right

(A) add 7 H2O to the left

(C) Multiply through by 2

(D) Add 8 e to the left

148. When temperature is increased the rate increases:

(A) only for chemical reactions between solids

(B) only for chemical reactions between gases

(D) there is not correct answer

(C) for all chemical reactions

180. Which one of the following is alkyne?

(B) \[C_4H_8 \]

(D) \[C_5H_{12}\]

(C) \[C_4H_{10}\]

(A) \[C_4H_6\]

227. How many isomers are possible for dibromobenzene:

(A) 4

(C) 3

(B) 2

(D) 1

162. The compounds CH3COCH2CH2CH3 and CH3CH2CH2CH2CH2OH are:

(B) chain isomers

(C) are not isomers

(D) are homologues

(A) positional isomers

207. Which of the following best describes a solution of acid?

Litmus Colour Reaction with Zn

(D) blue...............................................reaction

(A) red.................................................reaction

(C) blue...............................................no reaction

(B) red.................................................no reaction

120. Amines are

(A) organic bases that react with water to produce ammonia.

(D) organic acids that react with bases to form ammonium salts.

(B) organic acids that reacts with water to produce ammonia.

(C) organic bases that react with acids to form ammonium salts.

130. The heat of formation of pure carbon in different allotronic forms:

(A) depends on the allotropic form

(D) is always zero

(B) is always negative

(C) is always positive

190. In which row the heat of formation of the gases constantly increases:

(C) \[Cl_2, H_2, F_2, Br_2 \]

(D) There is not correct answer

(B) \[H_2, Br_2, Cl_2, F_2 \]

(A) \[F_2, Cl_2, Br_2, H_2\]

155. What is the IUPAC name of the compound shown?

(A) 5-chloro-2-nitrobenzoic acid

(B) 3-nitro-6-chlorobenzoic acid

(C) 2-chloro-5-nitrobenzoic acid

(D) 4-nitro-1.chlorobenzoic acid

171. the equilibrium constant of endothermic reaction depends on:

(C) changes in product concentrations

(D) there is no correct answer

(A) changes in temperature

(B) changes in reactant concentrations

247. Which of the statments are true?

Methane, Ethane, Hexane are:
I. homologies
II. are alcanes
III. are isomers
IV. are alkenes

(D) II and III

(A) I and III

(B) III and IV

(C) I and II

129. During an endothermic reaction the compounds with less energy are:

(A) reactants

(C) reactants, if they are in gas state

(D) there is not correct answer

(B) reactionproducts

228. The IUPAC name of para-dibromobenzene is:

(A) 1, 2-dibromobenzene

(D) 4-dibromobenzene

(B) 1,4-dibromobenzene

(C) 1,3-dibromobenzene

161. Which of the statements are true?

I. oxides of metals react with water to form hydroxides
II. oxides of metals react with water to form acids
III. oxides of non-metals react with water to form acids
IV. oxides of non-metals do not react with water

II and IV
I and III
I and IV
II and IV

(D) II and IV

(B) I and III

(C) I and IV

(A) II and IV

243. The principle difference between fructose and glucose is that_______.

(D) fructose is a ketone sugar and glucose is an aldehyde sugar

(B) fructose is a monosaccharide and glucose is a disaccharide

(C) fructose is a monoshaccaride and glucose is polysaccharide

(A) fructose is a disaccharide and glucose is a monosaccharide

238. How many single electrons have a phosphorus atom in not exited state:

(B) 2

(A) 1

(D) 4

(C) 3

157. Which one of the following bases is strong: Ca(OH)2, Al(OH)3, NH4OH, C5H5N

(C) Al(OH)3

(D) NH4OH

(B) Ca(OH)2

(A) C5H5N

224. The reaction of an alcohol and a carboxylic acid yields

(D) an aldehyde

(B) an ester

(A) a hydrocarbon

(C) an ether

187. Where you can find double bond in the following six compounds:

1. NH₃Cl; (2) HMnO₄; (3) C₂H₂; (4) HClO₄; (5) K₂CrO₄; (6) HClO;

(D) 4 and 6

(C) 3 and 5

(B) 1, 2 and 4

(A) 2,4 and 5

246. __________________is a monosaccharide

(B) maltose

(C) glucose

(A) sucrose

(D) lactose

124. In the IUPAC nomenclature system, the name of which of the following would end in -al?

(A) an alcohol

(C) an alkane

(B) an aldehyde

(D) a ketone

115. d-elements in the periodic table are:

(D) There is no current answer

(A) Located between 3th and 12th group

(B) Located between 3th and 6th group

(C) Randomly spread

199. What is the symbol for an ion which has 8 protons and 10 electrons?

(B) \[O^{2-}\]

(D) F

(C) \[O^{3-}\]

(A) \[N^{3-}\]

166. The thermal effect of chemical reaction represents:

(C) chemical nature of reaction products

(B) physical state (gas, liquid, solid) of reactants

(D) heat

(A) chemical nature of reactants

125. The general formula for an ether is

(A) R-O-R

(C) R-COOH

(B) R-CO-R

(D) R-OH

121. The alcohol that contains two alkyl groups attached to the carbon bonded to the –OH group is a

(C) primary alcohol

(B) tertiary alcohol

(D) secondary alcohol

(A) quaternary alcohol

234. \[Ag^+_{(ag)}+I^-_{(ag)} → AgI_{(s)}\] is example of:

(B) redox reaction

(C) acid-base reaction

(A) prticipation reaction

(D) precipitation and rebox reaction

175. The oxidation of ethanol produces _______.

(A) acetic acid

(B) formic acid

(D) lactic acid

(C) citric acid

184. What of the non-metals is usually used to kill microorganisms in water?

(B) Chlorine

(D) Sulphur

(A) Iodine

(C) Nitrogen

233. \[H_2O\] is

(A) base

(C) amphoric substance

(B) acid

(D) Lewis acid

237. Atomic orbitals:

(B) some of them have not assymetric shape

(D) there is no correct answer

(C) are three different types

(A) are the same number in electrons

135. Which one of the following statement is true?

(D) Nonmetals tend to reduce metals

(C) Nonmetals tend to oxidize metals

(A) Metals tend to oxidize nonmetals

(B) Metals do not react with nonmetals

240.The chemical reaction rate is fastest when occurs between:

(A) Solids

(D) gas and liquid

(B) Liquids

(C) gases

139. The general formula fo an ether is

(A) R-O-R

(C) R-COOH

(B) R-CO-R

(D) R-OH

143. Which of the properties of simple aromatic coumpound is true?

(D) They are not cyclic compounds

(C) They contain C=C bond in their structure

(A) The higher aromatic compounds are gases at room temperature

(B) They contain benzene ring

116. How many are the acceptor atoms involved in formation of hydrogen bonds between guanine and cytosine:

(C) Four

(B) Two

(D) There is no correct answer

(A) One

126. Which of the following is classified as an aldehyde?

(D) glycerine

(A) methanone

(B) phenol

(C) methanal

137. Pentane has

(A) three chain isomers

(C) two chain isomers

(D) one chain isomers

(B) four chain isomers

165. The shared electron pair in a covalent non-polar bound spatial is localized:

(B) closer to more electropositive atom

(C) at same distance between the two atoms

(D) there is no correct answer

(A) closer to more electronegative atom

152. Which choice gives the structures of the reaction products when the ester below is hydrolyzed in acidic solution?

A.
B.
C.

D.

(A)

(B)

(D)

(C)

196. The maximal number of electrons in the second electron shell is:

(A) 8

(C) 12

(D) 4

(B) 6

156. Which of the compound reacts most readily with aqueous ammonia?

(A) (CH3)2CCl

(C) (CH3CO)2O

(D) CH3CO2CH2CH3

(B) CH3COCl

211. The correct IUPAC name for the following compound is:

(D) 3-Chlorobutanal

(A) 2-Chloro-4-butanal

(B) 2-Chlorobutan-4-al

(C) 3-Chloro-4-butanal

186. The total sum of protons and neutrons in the nucleus of a chemical element determines:

(B) The number of electrons layers in the electron shell of an atom

(D) There is no correct answer

(C) The number of electrons in the last layers electron layer

(A) The consecutive number of the element in the periodic table

210. Which of the following alcohols gives the best yield of diakyl either by heating with a trace of sulfuric acid?

(A) Pentan-1-ol

(C) 2-Methybutan-2-ol

(D) 1-methylcyclohexam-1-ol

(B) Pentan-2-o1

182. What is the hybridization of each C atom in \[C_2H_4?\]

(D) sp for the first carbon atom and \[sp_2\] for the second one

(B) \[sp_3\]

(A) \[sp\]

(C) \[sp_2\]

191. The chemical reaction rate is fastest when occurs between:

(C) gases

(A) solids

(D) gas and liquid

(B) liquids

114. The number of atomic orbitals in the valence shell Ca atom are:

(C) 3

(D) 4

(A) 1

(B) 2

170. Equilibrium can be established during:

(D) hydrolysis of proteins

(C) interaction between CH3COOH and NaOH

(A) hydrolysis of saccharose

(B) interaction between HCl and NaOH

179. Which structure below represents a ketone?

(D)

(C)

(A)

(B)

144. The name of the compound

\[CH_3CH_2C(CH)_2CH_2CH_3\] is:

(B) 3,3-methylpentane

(C) 2-methyl-2-ethylburane

(A) 3,3-dimethylpentane

(D) 2-ethyl-2-methylburane

185. The number of protons in the nucleus of a chemical element determines:

(C) The atomic mass of the element

(D) There is no correct answer

(B) The number of electrons in the last layers electron layer

(A) The number of electron layers in the electron shell of the atom

208. Which of the following is the product of the reaction of 1-hexyne with 1 mol of

\[Br_2\]

(C) \[CH_3(CH_2)_3C_{|_{Br}}=CBH_2\]

(A) \[CH_3(CH_2)_3CH=CBr_2\]

(D) \[CH_3(CH_2)_3CH_2Br\]

(B) \[CH_3(CH_2)_3C_{|_{Br}}=CHBr\]

127. What is the correct classification for this alcohol?

(A) primary

(D) quaternary

(C) tertiary

(B) secondary

141. cis-trans isomerism is

(B) is a form of stereoisomerism

(A) not observed in the cyclic compounds

(C) is the same as E/Z isomerism

(D) possible for 1,2-dischlorethane

220. Of the two pairs of acids, which one is stronger in each pair?

(B) A1, A2

(C) B1, B2

(A) A1, B2

(D) B1, A2

221. Sugars are examples of what type of molecule?

(C) salts

(B) carbohydrates

(D) acids

(A) proteins

118. The two molecules represented below are:

(C) alcohols

(D) carboxylic acids

(A) isomers

(B) isotopes

192. When temperature is decreased the rate of a chemical reaction:

(D) slightly decreases only between gases

(C) always decreases

(A) always increases

(B) does not changes

223. Aniline is a(n)

(A) aliphatic amine.

(D) primary aromatic amine

(B) secondary aromatic amine

(C) heterocyclic amine

217. Which statement about the carbonyl group os alderhydes is true?

I. The carbon atom in the carbonyl group can attract nucleophiles.
II. The carbon atom in the carbonyl group can attract electrophiles.
III. The carbonyl group undergoes addition reaction.
IV. The carbon atom in the carbonyl group can attract Lewis acids

(C) I, II and III

(D) I, III and IV

(A) I and III

(B) II and IV

177. Proteins are biopolymers formed via multiple condensation coupling of which two functional groups?

(C) alcohol and carboxylic acid

(B) amine and carboxylic acid

(A) ester and amine

(D) alcohol and amine

169. The rate of a first order reaction is:

(B) highest in the final stages of the reaction

(A) highest in the initial stages of the reaction

(D) slowest in the initial stages of the reaction

(C) slowest in the initial stages of the reaction

142. Which of the statements are true?

Methane, ethane,hexane are?
I. homologies
II. are alkanes
III. are isomers
IV. are alkenes

(C) I and II

(B) III and IV

(A) I and II

(D) II and III

226. Markovnikov's rule is a reaction of

(C) radical polymerization

(D) oxidation

(A) addition

(B) substitution

216. Consider the following statement concerning the effect of the methyl group, - CH3, on an electrophil aromatic substitution:

I. The methyl group will activate the aromatic ring.
II. The methyl group will deactivate the aromatic ring.
III The methyl group will be meta-director.
IV. The methyl group will be an ortho- and a para-director.

(A) I and III;

(B) I and IV;

(D) II and IV

(C) II and III;

131. Which compound can form hydrogen chemical bonds:

(D) dihydrogen monoxide

(B) nitrogen

(C) carbon monoxide

(A) methane

235. The isotopes of a chemical element have:

(C) different number of electrons in the electron shell

(A) the same number in periodic table

(D) there is not correct answer

(B) the same mass number

229. What is the IUPAC name of

\[CH_3CH_2CH_2CH(CH_3)CH_3\]?

(D) 2-methylpentene

(B) 4-methylhpentane

(A) 2-methylhexane

(C) 2-methylpentane

236. If chnges in the nucleus of a chemical element occurs, the observed phenomena are:

(D) there is not correct answer

(A) chemical reaction

(B) molecular reaction

(C) ion exchange reaction

133. Aqua regia is:

(B) a mixture of concentrated \[HNO_3 \, and\, HCI\] in a ratio of 3:1

(D) mixture of concentrated \[HNO_3\, and \, H_2SO_4 in a ratio of 3:1

(C) a mixture of concentrated \[HNO_3 \, and \,H_2SO_4\] in a ratio of 1:3

(A) a mixture of concentrated \[HNO_3 \, and\, HCI\] in a ratio of 1:3

122. Which type of organic compound does not contain a carbonyl group?

(A) alcohol

(B) asters

(D) aldehydes

(C) ketones

231. What is the next step in balancing the half reaction:

\[SO_3^{{2-}}+H_2O→SO_4^{{2-}}+2H^+\] ?

(C) It is balanced

(B) Add 2e- to the left

(A) Add 2e- to the right

(D) Add 3H2O to the right

158. Which salt when dissolved in water would form a basic solution: KClO4, KCl, CH3COOK, KNO3

(A) KNO3

(B) KClO4

(D) KCl

(C) CH3COOK

214. Which one correctly depicts a quaternary ammonium ion?

(A) ...................?

(D) ................?

(C) ...................?

(B) ...................?