Random chemistry FINAL

Welcome to your Random chemistry FINAL

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

(C) ion exchange reaction

(A) chemical reaction

(B) molecular reaction

(D) there is not correct answer

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

(D) is always zero

(C) is always positive

(B) is always negative

(A) depends on the allotropic form

235. The isotopes of a chemical element have:

(B) the same mass number

(D) there is not correct answer

(C) different number of electrons in the electron shell

(A) the same number in periodic table

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

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

(C) an alkane

(B) an aldehyde

(D) a ketone

(A) an alcohol

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

\[Na_2S\] is

(B) \[S^{2-}+H_2O⇄OH^-+ HS^+\]

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

(C) \[Na_2S+2H_2O⇄2NaOH+H_2S\]

(A) \[Na_2 ⇄ 2 Na^++S^{2-}\]

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

(C) 3

(A) 1

(D) 4

(B) 2

115. d-elements in the periodic table are:

(D) There is no current answer

(B) Located between 3th and 6th group

(A) Located between 3th and 12th group

(C) Randomly spread

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

(A) (CH3)2CCl

(D) CH3CO2CH2CH3

(C) (CH3CO)2O

(B) CH3COCl

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

(B) phenol

(D) glycerine

(C) methanal

(A) methanone

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

(A) reactants

(D) there is not correct answer

(B) reactionproducts

(C) reactants, if they are in gas state

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

(B) reaction products

(A) reactants

(D) there is not correct answer

(C) reactant, if they are in gas state

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

(C) I and IV

(D) II and IV

(B) I and III

(A) II and IV

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

(A) Carboxylic acid

(C) Aldehyde

(D) Ester

(B) Ketone

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

(C) ketone

(B) amide

(A) amine

(D) aldehyde

139. The general formula fo an ether is

(C) R-COOH

(D) R-OH

(A) R-O-R

(B) R-CO-R

239. Electron configuration of phosphorus is:

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

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

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

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

193. The equilibrium constant:

(B) depend on changes in reactant concentrations

(C) depend on changes in product concentrations

(D) there is no correct answer

(A) can be changed at constant temperature

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

(C) an ether

(A) a hydrocarbon

(B) an ester

(D) an aldehyde

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

(C) slowest in the initial stages of the reaction

(D) slowest in the initial stages of the reaction

154. Select the monosaccharide (s).

(D) fructose and glucose

(C) glucose

(B) fructose

(A) sucrose

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

(C) always decreases

(A) always increases

(D) slightly decreases only between gases

(B) does not changes

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

\[Cr_2O_7{^{2-}} → 2Cr^{3+}\] ?

(A) add 7 H2O to the left

(B) add 7 H2O to the right

(C) Multiply through by 2

(D) Add 8 e to the left

202. In a redox reaction, there must be:

(D) No reducing or oxidizing agent

(B) A reducing agent and no oxidizing agent

(A) An oxidizing agent and no reducing agent

(C) A reducing agent and an oxidizing agent

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

(B) reactants, if they are in gas state

(A) reactants

(C) reaction products

(D) there is no correct answer

134. The principal difference between fructose ans glucose is that__________

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

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

(C) fructose is a monosaccharide and glucose is polysaccharide

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

180. Which one of the following is alkyne?

(C) \[C_4H_{10}\]

(B) \[C_4H_8 \]

(A) \[C_4H_6\]

(D) \[C_5H_{12}\]

175. The oxidation of ethanol produces _______.

(D) lactic acid

(A) acetic acid

(B) formic acid

(C) citric acid

213. Peptide bonds can be classified as:

(D) Esters

(A) Amines

(B) Carboxylic acids

(C) Amides

189. During an endothermic reaction:

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

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

(A) there is no energy exchange

(D) there is no correct answer

226. Markovnikov's rule is a reaction of

(B) substitution

(C) radical polymerization

(D) oxidation

(A) addition

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

(D) N, O

(A) O, I

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

(A) closer to more electronegative atom

(D) there is no correct answer

162. The compounds CH3COCH2CH2CH3 and CH3CH2CH2CH2CH2OH are:

(A) positional isomers

(C) are not isomers

(D) are homologues

(B) chain isomers

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

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

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

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

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

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

146. At equilibrium, concentration is of reactants:

(A) are highest

(D) are variable

(B) are lowest

(C) are constant

209. Which compound undergoes the substitution reaction with NaCN?

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

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

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

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

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

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

(D) There is not correct answer

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

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

125. The general formula for an ether is

(C) R-COOH

(A) R-O-R

(B) R-CO-R

(D) R-OH

135. Which one of the following statement is true?

(B) Metals do not react with nonmetals

(A) Metals tend to oxidize nonmetals

(D) Nonmetals tend to reduce metals

(C) Nonmetals tend to oxidize metals

142. Which of the statements are true?

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

(A) I and II

(C) I and II

(B) III and IV

(D) II and III

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

(B) Two

(C) Four

(A) One

(D) There is no correct answer

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 \[CO_2(s)\, and \,H_2O(g)\]

244. 1, 2-dichlorethene has

(A) no isomers

(B) cis-trans isomers

(D) positional isomers

(C) chain isomers

200. Select the formula of potassium dichromate:

(A) \[K_2Cr_2O_7\]

(C) \[KCr_2O_5\]

(D) \[K2Cr_2O_4\]

(B) \[KCr_2O_7\]

170. Equilibrium can be established during:

(C) interaction between CH3COOH and NaOH

(D) hydrolysis of proteins

(B) interaction between HCl and NaOH

(A) hydrolysis of saccharose

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

(A) \[sp\]

(C) \[sp_2\]

(B) \[sp_3\]

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

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

(A) alcohol

(C) ketones

(B) asters

(D) aldehydes

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

R-OH + RCOOH ->

(B) ether

(D) ester

(C) aldehyde

(A) ketone

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

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

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

(C) fructose is a monoshaccaride and glucose is polysaccharide

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

136. I, 2-dichlorethene has

(C) chain isomers

(D) positional isomers

(A) no isomers

(B) cis-trans isomers

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.

(D) II and IV

(A) I and III;

(B) I and IV;

(C) II and III;

212. Which reactionis NOT possible with acetic acid?

\[CH_3COOH + NH_3→\]

(A) \[CH_3COOH + NaOH→\]

(C) \[CH_3COOH + Na_2CO_3→\]

(B) \[CH_3COOH + NaCl→\]

197. The nucleus of an atom:

(C) has positive electric charge

(D) does not contain neutrons

(A) is neutral

(B) contains electrons

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

123. Select the monosaccharide (s).

(B) fructose

(A) sucrose

(C) glucose

(D) fructose and glucose

171. the equilibrium constant of endothermic reaction depends on:

(A) changes in temperature

(D) there is no correct answer

(C) changes in product concentrations

(B) changes in reactant concentrations

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

(C) Al(OH)3

(A) C5H5N

(D) NH4OH

(B) Ca(OH)2

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

(B) Pentan-2-o1

(D) 1-methylcyclohexam-1-ol

163. C3H8O has

(C) two isomers

(A) three isomers

(D) only one isomer

(B) four isomers

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

(C) The atomic mass of the element

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

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

(D) There is no correct answer

131. Which compound can form hydrogen chemical bonds:

(A) methane

(C) carbon monoxide

(D) dihydrogen monoxide

(B) nitrogen

203. What is the name of the compound below:

(A) 2,4-methylbutene

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

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

(B) 2,5-dimethylpentane

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

(D) gas and liquid

(A) solids

(B) liquids

(C) gases

140. _________________ is a disaccharide

(A) glucose

(C) sucrose

(B) galactose

(D) ribose

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

(B) amide

(A) amine

(D) aldehyde

(C) ketone

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

(C) I and IV

(A) II and IV

(B) I and III

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

179. Which structure below represents a ketone?

(B)

(A)

(D)

(C)

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

(B) always increases

(A) does not change

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

(C) always decreases

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

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

(D) F

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

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

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

(C) alcohol and carboxylic acid

(D) alcohol and amine

(A) ester and amine

(B) amine and carboxylic acid

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

(A) 8

(B) 6

(D) 4

(C) 12

164. In which compound there is ionic chemical bond:

(D) H2S

(A) NO2

(C) KS

(B) HNO3

228. The IUPAC name of para-dibromobenzene is:

(A) 1, 2-dibromobenzene

(D) 4-dibromobenzene

(C) 1,3-dibromobenzene

(B) 1,4-dibromobenzene

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

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

(B) Add 2e- to the left

(C) It is balanced

(D) Add 3H2O to the right

(A) Add 2e- to the right

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

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

(C) 3 and 5

(B) 1, 2 and 4

(A) 2,4 and 5

(D) 4 and 6

247. Which of the statments are true?

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

(A) I and III

(D) II and III

(C) I and II

(B) III and IV

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

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

(B) They contain benzene ring

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

(D) They are not cyclic compounds

147. The rate of a chemical reaction decreases if:

(C) The temperature is decreased

(B) the atmospheric pressure is kept constant

(A) the activation energy is decreased

(D) some of the reaction products are gases

141. cis-trans isomerism is

(B) is a form of stereoisomerism

(D) possible for 1,2-dischlorethane

(C) is the same as E/Z isomerism

(A) not observed in the cyclic compounds

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

(C) 1π-bonds and 3σ-bonds

(B) 4π-bonds and 2σ-bonds

(D) 4σ-bonds

(A) 4π-bonds

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

(D) 3-Chlorobutanal

(C) 3-Chloro-4-butanal

(A) 2-Chloro-4-butanal

(B) 2-Chlorobutan-4-al

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

(D) is always zero

(B) is always negative

(A) depends on the allotropic form

(C) is always positive

118. The two molecules represented below are:

(A) isomers

(B) isotopes

(D) carboxylic acids

(C) alcohols

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

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

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

(B) Liquids

(C) gases

(A) Solids

(D) gas and liquid

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

(B) Zinc oxide and copper oxide

(A) Zinc sulfate and copper

(D) Zinc oxide, copper oxide and oxygen

(C) Zinc oxide, copper oxide and sulfur dioxide

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

(A) methanone

(B) phenol

(D) glycerine

(C) methanal

223. Aniline is a(n)

(C) heterocyclic amine

(D) primary aromatic amine

(A) aliphatic amine.

(B) secondary aromatic amine

232. The oxidation number of C in

\[H_2C_2O_4\] is?

(C) +4

(D) -2

(B) +2

(A) +3

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

(D) 3

(B) 2 and 3

(A) 1 and 3

(C) 2

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

(B) KClO4

(D) KCl

(C) CH3COOK

(A) KNO3

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

Litmus Colour Reaction with Zn

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

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

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

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

132. Noble metals

(A) react with air

(B) do not react with air

(C) react with air but not react with water

(D) do not react with air and water

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

(D) There is no correct answer

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

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

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

221. Sugars are examples of what type of molecule?

(A) proteins

(D) acids

(C) salts

(B) carbohydrates

214. Which one correctly depicts a quaternary ammonium ion?

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

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

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

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

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

(B) II and IV

(C) I, II and III

(D) III and IV

(A) I and IV

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

(C) Nitrogen

(D) Sulphur

(B) Chlorine

(A) Iodine

127. What is the correct classification for this alcohol?

(A) primary

(C) tertiary

(B) secondary

(D) quaternary

166. The thermal effect of chemical reaction represents:

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

(C) chemical nature of reaction products

(D) heat

(A) chemical nature of reactants

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

(A) I and III

(B) II and IV

(C) I, II and III

(D) I, 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.

(D)

(C)

(A)

(B)

181. Which of the following is alkane:

(B) \[C_6H_{12}\]

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

(D) \[C_5H_{10}\]

(A) \[C_6H_{14}\]

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

(B) ester

(D) amide

(C) amine

(A) ketone

188. What are the possible oxidation states of sulphur:

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

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

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

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

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

(A) D-Sucrose

(C) D-Mannose

(B) D-Glucose

(D) D-Ribose

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

(C) sometimes increases

(D) does not change

(B) always decreases

(A) always increases

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

(D) hydrogen

(C) ionic

(A) covalent

(B) peptide

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

(B) maltose

(D) amides

(C) ethers

(A) ketones

119. Which of these statements describes a condensation reaction?

(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

(D) hydrolysis of an ester

151. Which one correctly depicts a primary amine?

(B)

(C)

(A)

(D)

137. Pentane has

(B) four chain isomers

(C) two chain isomers

(A) three chain isomers

(D) one chain isomers

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

(B) 4-methyl-2-pentanol

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

(C) 2-methyl-4-pentanol

(D) 2-isohexanol

227. How many isomers are possible for dibromobenzene:

(D) 1

(A) 4

(C) 3

(B) 2

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

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

(B) \[sp^3\]

(C) \[sp^2\]

(A) \[sp\]

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

\[CH_3CH_2CH_2CH_2OH\]

(A)

(D)

(B)

(C)

237. Atomic orbitals:

(A) are the same number in electrons

(D) there is no correct answer

(C) are three different types

(B) some of them have not assymetric shape

120. Amines are

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

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

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

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

233. \[H_2O\] is

(C) amphoric substance

(B) acid

(D) Lewis acid

(A) base

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

(A) A1, B2

(C) B1, B2

(B) A1, A2

(D) B1, A2

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

(C) 3

(D) 4

(A) 1

(B) 2

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

\[Br_2\]

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

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

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

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

225. The name for the compound with the formula

\[CH_3CH_2CH_2CH_2OH\] is

(B) propane

(C) butanol

(D) pentanol

(A) propanol

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

(B) tertiary alcohol

(D) secondary alcohol

(A) quaternary alcohol

(C) primary alcohol

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

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

(D) precipitation and rebox reaction

(B) redox reaction

(A) prticipation reaction

(C) acid-base reaction

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

(C) ketones

(A) alcohol

(D) aldehydes

(B) asters

194. The equilibrium constant:

(C) depend on changes in product concentrations

(B) depend on changes in reactant concentrations

(A) can be changed at constant temperature

(D) there is no correct answer

246. __________________is a monosaccharide

(B) maltose

(A) sucrose

(C) glucose

(D) lactose

144. The name of the compound

\[CH_3CH_2C(CH)_2CH_2CH_3\] is:

(D) 2-ethyl-2-methylburane

(C) 2-methyl-2-ethylburane

(B) 3,3-methylpentane

(A) 3,3-dimethylpentane

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

(A) always changes

(B) never changes

(C) sometimes changes

(D) there is no correct answer