Random chemistry FINAL

Welcome to your Random chemistry FINAL

170. Equilibrium can be established during:

(C) interaction between CH3COOH and NaOH

(D) hydrolysis of proteins

(A) hydrolysis of saccharose

(B) interaction between HCl and NaOH

139. The general formula fo an ether is

(A) R-O-R

(B) R-CO-R

(C) R-COOH

(D) R-OH

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

(B) A1, A2

(A) A1, B2

(C) B1, B2

(D) B1, A2

134. The principal difference between fructose ans glucose is that__________

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

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

(C) fructose is a monosaccharide and glucose is polysaccharide

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

175. The oxidation of ethanol produces _______.

(B) formic acid

(C) citric acid

(A) acetic acid

(D) lactic acid

162. The compounds CH3COCH2CH2CH3 and CH3CH2CH2CH2CH2OH are:

(B) chain isomers

(D) are homologues

(A) positional isomers

(C) are not isomers

239. Electron configuration of phosphorus is:

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

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

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

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

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

(C) 1π-bonds and 3σ-bonds

(A) 4π-bonds

(D) 4σ-bonds

(B) 4π-bonds and 2σ-bonds

193. The equilibrium constant:

(B) depend on changes in reactant concentrations

(A) can be changed at constant temperature

(D) there is no correct answer

(C) depend on changes in product concentrations

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

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

(D) There is no correct answer

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

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

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

(D) secondary alcohol

(A) quaternary alcohol

(C) primary alcohol

(B) tertiary alcohol

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

(B) 2-Chlorobutan-4-al

(C) 3-Chloro-4-butanal

(A) 2-Chloro-4-butanal

(D) 3-Chlorobutanal

164. In which compound there is ionic chemical bond:

(C) KS

(D) H2S

(A) NO2

(B) HNO3

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

(A) Butanoic acid

(C) Butan-2-one

(B) Butan-1-ol

(D) Butan-2-ol

233. \[H_2O\] is

(B) acid

(C) amphoric substance

(A) base

(D) Lewis acid

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

(B) Chlorine

(D) Sulphur

(A) Iodine

(C) Nitrogen

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

(A) amine

(B) amide

(C) ketone

(D) aldehyde

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

(C) CH3COOK

(A) KNO3

(B) KClO4

(D) KCl

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

(C) always decreases

(A) always increases

(B) does not changes

(D) slightly decreases only between gases

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

(B) asters

(C) ketones

(D) aldehydes

(A) alcohol

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

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

(D) 2-isohexanol

(C) 2-methyl-4-pentanol

(B) 4-methyl-2-pentanol

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

Litmus Colour Reaction with Zn

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

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

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

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

203. What is the name of the compound below:

(B) 2,5-dimethylpentane

(A) 2,4-methylbutene

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

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

195. The electrons in the first electron shell have:

(D) the same amount of energy as the protons

(A) the lowest energy in the atom

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

(B) have no energy

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

(B) closer to more electropositive atom

(D) there is no correct answer

(C) at same distance between the two atoms

(A) closer to more electronegative atom

226. Markovnikov's rule is a reaction of

(B) substitution

(D) oxidation

(A) addition

(C) radical polymerization

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

\[Br_2\]

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

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

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

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

197. The nucleus of an atom:

(A) is neutral

(C) has positive electric charge

(D) does not contain neutrons

(B) contains electrons

246. __________________is a monosaccharide

(D) lactose

(A) sucrose

(B) maltose

(C) glucose

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

(A) amine

(C) ketone

(D) aldehyde

(B) amide

151. Which one correctly depicts a primary amine?

(A)

(B)

(C)

(D)

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

\[HNO_2 +\,→\,NO + I3 -\]

(A) O, I

(C) N, I-

(B) I-, N

(D) N, O

223. Aniline is a(n)

(B) secondary aromatic amine

(D) primary aromatic amine

(C) heterocyclic amine

(A) aliphatic amine.

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

\[Cr_2O_7{^{2-}} → 2Cr^{3+}\] ?

(B) add 7 H2O to the right

(D) Add 8 e to the left

(A) add 7 H2O to the left

(C) Multiply through by 2

180. Which one of the following is alkyne?

(D) \[C_5H_{12}\]

(C) \[C_4H_{10}\]

(A) \[C_4H_6\]

(B) \[C_4H_8 \]

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

(A) 1 and 3

(C) 2

(B) 2 and 3

(D) 3

179. Which structure below represents a ketone?

(D)

(A)

(B)

(C)

214. Which one correctly depicts a quaternary ammonium ion?

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

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

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

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

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

(A) Solids

(C) gases

(D) gas and liquid

(B) Liquids

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

(B) is always negative

(C) is always positive

(A) depends on the allotropic form

(D) is always zero

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

(D) a ketone

(B) an aldehyde

(A) an alcohol

(C) an alkane

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

(A) II and IV

(B) I and III

(D) II and IV

(C) I and IV

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

(A) reactants

(B) reactionproducts

(D) there is not correct answer

(C) reactants, if they are in gas state

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

(D) 1-methylcyclohexam-1-ol

(A) Pentan-1-ol

(C) 2-Methybutan-2-ol

(B) Pentan-2-o1

189. During an endothermic reaction:

(D) there is no correct answer

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

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

(A) there is no energy exchange

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

\[Na_2S\] is

(C) \[Na_2S+2H_2O⇄2NaOH+H_2S\]

(B) \[S^{2-}+H_2O⇄OH^-+ HS^+\]

(A) \[Na_2 ⇄ 2 Na^++S^{2-}\]

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

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

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

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

(D) there re not correct answer

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

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

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

(C) sometimes increases

(D) does not change

(A) always increases

(B) always decreases

188. What are the possible oxidation states of sulphur:

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

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

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

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

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) \[sp_2\]

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

(B) reactants, if they are in gas state

(D) there is no correct answer

(C) reaction products

(A) reactants

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

(D) gas and liquid

(C) gases

(A) solids

(B) liquids

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

(A) always changes

(D) there is no correct answer

(C) sometimes changes

(B) never changes

237. Atomic orbitals:

(B) some of them have not assymetric shape

(C) are three different types

(D) there is no correct answer

(A) are the same number in electrons

133. Aqua regia is:

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

(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

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

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

(A) depends on the allotropic form

(C) is always positive

(B) is always negative

(D) is always zero

212. Which reactionis NOT possible with acetic acid?

(A) \[CH_3COOH + NaOH→\]

(B) \[CH_3COOH + NaCl→\]

(C) \[CH_3COOH + Na_2CO_3→\]

\[CH_3COOH + NH_3→\]

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

(A) Carboxylic acid

(B) Ketone

(C) Aldehyde

(D) Ester

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

(B) 2

(A) 1

(D) 4

(C) 3

125. The general formula for an ether is

(C) R-COOH

(A) R-O-R

(D) R-OH

(B) R-CO-R

235. The isotopes of a chemical element have:

(A) the same number in periodic table

(B) the same mass number

(D) there is not correct answer

(C) different number of electrons in the electron shell

209. Which compound undergoes the substitution reaction with NaCN?

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

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

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

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

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

(D) amide

(A) ketone

(C) amine

(B) ester

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

(A) methanone

(B) phenol

(C) methanal

(D) glycerine

115. d-elements in the periodic table are:

(A) Located between 3th and 12th group

(D) There is no current answer

(B) Located between 3th and 6th group

(C) Randomly spread

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

(B) maltose

(C) ethers

(D) amides

(A) ketones

213. Peptide bonds can be classified as:

(C) Amides

(A) Amines

(D) Esters

(B) Carboxylic acids

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

\[CH_3CH_2CH_2CH_2OH\]

(C)

(D)

(A)

(B)

163. C3H8O has

(A) three isomers

(D) only one isomer

(B) four isomers

(C) two isomers

147. The rate of a chemical reaction decreases if:

(B) the atmospheric pressure is kept constant

(A) the activation energy is decreased

(C) The temperature is decreased

(D) some of the reaction products are gases

140. _________________ is a disaccharide

(B) galactose

(A) glucose

(D) ribose

(C) sucrose

148. When temperature is increased the rate increases:

(C) for all chemical reactions

(A) only for chemical reactions between solids

(D) there is not correct answer

(B) only for chemical reactions between gases

127. What is the correct classification for this alcohol?

(A) primary

(B) secondary

(D) quaternary

(C) tertiary

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

(D) an aldehyde

(A) a hydrocarbon

(B) an ester

(C) an ether

123. Select the monosaccharide (s).

(A) sucrose

(C) glucose

(D) fructose and glucose

(B) fructose

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

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

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

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

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

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

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

(B) Zinc oxide and copper oxide

(C) Zinc oxide, copper oxide and sulfur dioxide

(A) Zinc sulfate and copper

(D) Zinc oxide, copper oxide and oxygen

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

(C) ionic

(B) peptide

(A) covalent

(D) hydrogen

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

R-OH + RCOOH ->

(B) ether

(A) ketone

(C) aldehyde

(D) ester

131. Which compound can form hydrogen chemical bonds:

(B) nitrogen

(C) carbon monoxide

(A) methane

(D) dihydrogen monoxide

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

(C) 2-chloro-5-nitrobenzoic acid

(B) 3-nitro-6-chlorobenzoic acid

(A) 5-chloro-2-nitrobenzoic acid

(D) 4-nitro-1.chlorobenzoic acid

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

(A) reactants

(B) reaction products

(D) there is not correct answer

(C) reactant, if they are in gas state

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

(D) aldehydes

(B) asters

(C) ketones

(A) alcohol

202. In a redox reaction, there must be:

(A) An oxidizing agent and no reducing agent

(C) A reducing agent and an oxidizing agent

(B) A reducing agent and no oxidizing agent

(D) No reducing or oxidizing agent

232. The oxidation number of C in

\[H_2C_2O_4\] is?

(D) -2

(C) +4

(A) +3

(B) +2

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

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

(C) The atomic mass of the element

(D) There is no correct answer

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

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.

(C) II and III;

(A) I and III;

(B) I and IV;

(D) II and IV

166. The thermal effect of chemical reaction represents:

(D) heat

(C) chemical nature of reaction products

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

(A) chemical nature of reactants

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

(B) molecular reaction

(A) chemical reaction

(D) there is not correct answer

(C) ion exchange reaction

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

(D) CH3CO2CH2CH3

(A) (CH3)2CCl

(B) CH3COCl

(C) (CH3CO)2O

118. The two molecules represented below are:

(D) carboxylic acids

(C) alcohols

(B) isotopes

(A) isomers

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

(A) \[sp\]

(C) \[sp^2\]

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

(B) \[sp^3\]

144. The name of the compound

\[CH_3CH_2C(CH)_2CH_2CH_3\] is:

(D) 2-ethyl-2-methylburane

(A) 3,3-dimethylpentane

(B) 3,3-methylpentane

(C) 2-methyl-2-ethylburane

135. Which one of the following statement is true?

(B) Metals do not react with nonmetals

(D) Nonmetals tend to reduce metals

(C) Nonmetals tend to oxidize metals

(A) Metals tend to oxidize nonmetals

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

(B) Two

(A) One

(C) Four

(D) There is no correct answer

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

(C) fructose is a monoshaccaride and glucose is polysaccharide

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

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

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

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

(B) D-Glucose

(A) D-Sucrose

(D) D-Ribose

(C) D-Mannose

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

(B) I and III

(C) I and IV

(D) II and IV

(A) II and IV

171. the equilibrium constant of endothermic reaction depends on:

(A) changes in temperature

(C) changes in product concentrations

(B) changes in reactant concentrations

(D) there is no correct answer

169. The rate of a first order reaction is:

(C) slowest in the initial stages of the reaction

(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

221. Sugars are examples of what type of molecule?

(B) carbohydrates

(A) proteins

(D) acids

(C) salts

146. At equilibrium, concentration is of reactants:

(A) are highest

(D) are variable

(C) are constant

(B) are lowest

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

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

(B) They contain benzene ring

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

(D) They are not cyclic compounds

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

(B) phenol

(A) methanone

(D) glycerine

(C) methanal

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

(C) I, II and III

(A) I and IV

(B) II and IV

(D) III and IV

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

(A) does not change

(C) always decreases

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

(B) always increases

229. What is the IUPAC name of

\[CH_3CH_2CH_2CH(CH_3)CH_3\]?

(A) 2-methylhexane

(C) 2-methylpentane

(D) 2-methylpentene

(B) 4-methylhpentane

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

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

(C) I and II

(B) III and IV

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)

(C)

(D)

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

(B) 6

(C) 12

(D) 4

(A) 8

137. Pentane has

(D) one chain isomers

(C) two chain isomers

(A) three chain isomers

(B) four chain isomers

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

(D) F

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

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

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

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

(A) 2,4 and 5

(B) 1, 2 and 4

(C) 3 and 5

227. How many isomers are possible for dibromobenzene:

(D) 1

(C) 3

(A) 4

(B) 2

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

(B) II and IV

(C) I, II and III

(D) I, III and IV

(A) I and III

132. Noble metals

(C) react with air but not react with water

(B) do not react with air

(A) react with air

(D) do not react with air and water

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

(A) 1

(C) 3

(B) 2

(D) 4

200. Select the formula of potassium dichromate:

(D) \[K2Cr_2O_4\]

(A) \[K_2Cr_2O_7\]

(C) \[KCr_2O_5\]

(B) \[KCr_2O_7\]

244. 1, 2-dichlorethene has

(D) positional isomers

(C) chain isomers

(B) cis-trans isomers

(A) no isomers

225. The name for the compound with the formula

\[CH_3CH_2CH_2CH_2OH\] is

(C) butanol

(D) pentanol

(B) propane

(A) propanol

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

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

(A) Add 2e- to the right

(C) It is balanced

(D) Add 3H2O to the right

(B) Add 2e- to the left

181. Which of the following is alkane:

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

(A) \[C_6H_{14}\]

(B) \[C_6H_{12}\]

(D) \[C_5H_{10}\]

194. The equilibrium constant:

(B) depend on changes in reactant concentrations

(C) depend on changes in product concentrations

(A) can be changed at constant temperature

(D) there is no correct answer

154. Select the monosaccharide (s).

(B) fructose

(C) glucose

(A) sucrose

(D) fructose and glucose

142. Which of the statements are true?

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

(D) II and III

(A) I and II

(B) III and IV

(C) I and II

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

(D) There is not correct answer

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

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

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

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

(D) precipitation and rebox reaction

(C) acid-base reaction

(B) redox reaction

(A) prticipation reaction

120. Amines are

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

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

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

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

119. Which of these statements describes a condensation reaction?

(D) hydrolysis of an ester

(C) oxidation of ethanol to acetaldehyde

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

(A) addition of H2O to a double bond

141. cis-trans isomerism is

(B) is a form of stereoisomerism

(C) is the same as E/Z isomerism

(A) not observed in the cyclic compounds

(D) possible for 1,2-dischlorethane

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

(B) amine and carboxylic acid

(C) alcohol and carboxylic acid

(D) alcohol and amine

(A) ester and amine

228. The IUPAC name of para-dibromobenzene is:

(A) 1, 2-dibromobenzene

(B) 1,4-dibromobenzene

(D) 4-dibromobenzene

(C) 1,3-dibromobenzene

136. I, 2-dichlorethene has

(D) positional isomers

(A) no isomers

(C) chain isomers

(B) cis-trans isomers