Random chemistry FINAL

Welcome to your Random chemistry FINAL

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

(D) NH4OH

(C) Al(OH)3

(B) Ca(OH)2

(A) C5H5N

228. The IUPAC name of para-dibromobenzene is:

(D) 4-dibromobenzene

(C) 1,3-dibromobenzene

(B) 1,4-dibromobenzene

(A) 1, 2-dibromobenzene

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

(C) Butan-2-one

(A) Butanoic acid

(D) Butan-2-ol

(B) Butan-1-ol

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

(B) Ketone

(D) Ester

(A) Carboxylic acid

(C) Aldehyde

146. At equilibrium, concentration is of reactants:

(A) are highest

(B) are lowest

(D) are variable

(C) are constant

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

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

223. Aniline is a(n)

(A) aliphatic amine.

(C) heterocyclic amine

(D) primary aromatic amine

(B) secondary aromatic amine

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

(A) reactants

(D) there is no correct answer

(B) reactants, if they are in gas state

(C) reaction products

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

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

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

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

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

(B) 1, 2 and 4

(A) 2,4 and 5

(C) 3 and 5

200. Select the formula of potassium dichromate:

(C) \[KCr_2O_5\]

(D) \[K2Cr_2O_4\]

(A) \[K_2Cr_2O_7\]

(B) \[KCr_2O_7\]

221. Sugars are examples of what type of molecule?

(D) acids

(B) carbohydrates

(A) proteins

(C) salts

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

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

(C) reactant, if they are in gas state

(A) reactants

(B) reaction products

(D) there is not correct answer

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

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

(D) F

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

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

141. cis-trans isomerism is

(B) is a form of stereoisomerism

(C) is the same as E/Z isomerism

(D) possible for 1,2-dischlorethane

(A) not observed in the cyclic compounds

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

(D) aldehyde

(C) ketone

(B) amide

(A) amine

164. In which compound there is ionic chemical bond:

(B) HNO3

(D) H2S

(C) KS

(A) NO2

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

(B) 6

(D) 4

(C) 12

(A) 8

209. Which compound undergoes the substitution reaction with NaCN?

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

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

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

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

195. The electrons in the first electron shell have:

(B) have no energy

(A) the lowest energy in the atom

(D) the same amount of energy as the protons

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

246. __________________is a monosaccharide

(D) lactose

(C) glucose

(A) sucrose

(B) maltose

162. The compounds CH3COCH2CH2CH3 and CH3CH2CH2CH2CH2OH are:

(B) chain isomers

(C) are not isomers

(A) positional isomers

(D) are homologues

179. Which structure below represents a ketone?

(B)

(C)

(D)

(A)

214. Which one correctly depicts a quaternary ammonium ion?

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

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

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

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

197. The nucleus of an atom:

(D) does not contain neutrons

(A) is neutral

(B) contains electrons

(C) has positive electric charge

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

(C) 2-Methybutan-2-ol

(B) Pentan-2-o1

(A) Pentan-1-ol

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

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

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

(D) there re not correct answer

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

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

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

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

134. The principal difference between fructose ans glucose is that__________

(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

(C) fructose is a monosaccharide and glucose is polysaccharide

189. During an endothermic reaction:

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

(A) there is no energy exchange

(D) there is no correct answer

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

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

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

(D) Add 3H2O to the right

(B) Add 2e- to the left

(C) It is balanced

(A) Add 2e- to the right

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

(A) I and II

(B) III and IV

(D) II and III

237. Atomic orbitals:

(C) are three different types

(A) are the same number in electrons

(D) there is no correct answer

(B) some of them have not assymetric shape

133. Aqua regia is:

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

(B) a mixture of concentrated \[HNO_3 \, and\, HCI\] 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

244. 1, 2-dichlorethene has

(D) positional isomers

(A) no isomers

(C) chain isomers

(B) cis-trans isomers

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

(B) liquids

(C) gases

(D) gas and liquid

(A) solids

119. Which of these statements describes a condensation reaction?

(A) addition of H2O to a double bond

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

(D) hydrolysis of an ester

(C) oxidation of ethanol to acetaldehyde

170. Equilibrium can be established during:

(B) interaction between HCl and NaOH

(A) hydrolysis of saccharose

(D) hydrolysis of proteins

(C) interaction between CH3COOH and NaOH

135. Which one of the following statement is true?

(D) Nonmetals tend to reduce metals

(A) Metals tend to oxidize nonmetals

(B) Metals do not react with nonmetals

(C) Nonmetals tend to oxidize metals

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

(C) 2-methyl-4-pentanol

(B) 4-methyl-2-pentanol

(D) 2-isohexanol

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

166. The thermal effect of chemical reaction represents:

(A) chemical nature of reactants

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

(D) heat

(C) chemical nature of reaction products

239. Electron configuration of phosphorus is:

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

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

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

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

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

(B) peptide

(C) ionic

(A) covalent

(D) hydrogen

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

(C) is always positive

(A) depends on the allotropic form

(B) is always negative

(D) is always zero

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

(C) Four

(B) Two

(A) One

(D) There is no correct answer

118. The two molecules represented below are:

(B) isotopes

(A) isomers

(D) carboxylic acids

(C) alcohols

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

(A) 2-Chloro-4-butanal

(B) 2-Chlorobutan-4-al

(D) 3-Chlorobutanal

(C) 3-Chloro-4-butanal

163. C3H8O has

(D) only one isomer

(C) two isomers

(B) four isomers

(A) three isomers

188. What are the possible oxidation states of sulphur:

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

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

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

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

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

(A) 5-chloro-2-nitrobenzoic acid

(C) 2-chloro-5-nitrobenzoic acid

(B) 3-nitro-6-chlorobenzoic acid

(D) 4-nitro-1.chlorobenzoic acid

229. What is the IUPAC name of

\[CH_3CH_2CH_2CH(CH_3)CH_3\]?

(D) 2-methylpentene

(A) 2-methylhexane

(B) 4-methylhpentane

(C) 2-methylpentane

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

(B) A1, A2

(C) B1, B2

(D) B1, A2

(A) A1, B2

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

(C) 2

(B) 2 and 3

(A) 1 and 3

(D) 3

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

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

(C) fructose is a monoshaccaride and glucose is polysaccharide

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

(A) Zinc sulfate and copper

(D) Zinc oxide, copper oxide and oxygen

(C) Zinc oxide, copper oxide and sulfur dioxide

(B) Zinc oxide and copper oxide

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

(A) (CH3)2CCl

(B) CH3COCl

(C) (CH3CO)2O

(D) CH3CO2CH2CH3

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

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

(C) ketones

(D) aldehydes

(B) asters

(A) alcohol

181. Which of the following is alkane:

(B) \[C_6H_{12}\]

(D) \[C_5H_{10}\]

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

(A) \[C_6H_{14}\]

123. Select the monosaccharide (s).

(D) fructose and glucose

(C) glucose

(A) sucrose

(B) fructose

132. Noble metals

(A) react with air

(C) react with air but not react with water

(B) do not react with air

(D) do not react with air and water

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

(D) amide

(C) amine

(A) ketone

(B) ester

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

(C) I, II and III

(B) II and IV

(D) I, III and IV

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

\[HNO_2 +\,→\,NO + I3 -\]

(B) I-, N

(D) N, O

(C) N, I-

(A) O, I

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

(B) reactionproducts

(D) there is not correct answer

(C) reactants, if they are in gas state

(A) reactants

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

(C) alcohol and carboxylic acid

(D) alcohol and amine

(B) amine and carboxylic acid

(A) ester and amine

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

(D) Sulphur

(B) Chlorine

(C) Nitrogen

(A) Iodine

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

(C) sometimes changes

(D) there is no correct answer

(B) never changes

(A) always changes

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

R-OH + RCOOH ->

(C) aldehyde

(A) ketone

(D) ester

(B) ether

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

\[Na_2S\] is

(B) \[S^{2-}+H_2O⇄OH^-+ HS^+\]

(A) \[Na_2 ⇄ 2 Na^++S^{2-}\]

(C) \[Na_2S+2H_2O⇄2NaOH+H_2S\]

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

235. The isotopes of a chemical element have:

(D) there is not correct answer

(B) the same mass number

(C) different number of electrons in the electron shell

(A) the same number in periodic table

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

(A) always increases

(D) does not change

(C) sometimes increases

(B) always decreases

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

(A) alcohol

(B) asters

(D) aldehydes

(C) ketones

180. Which one of the following is alkyne?

(A) \[C_4H_6\]

(C) \[C_4H_{10}\]

(B) \[C_4H_8 \]

(D) \[C_5H_{12}\]

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

(D) KCl

(C) CH3COOK

(B) KClO4

(A) KNO3

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

(A) \[sp\]

(C) \[sp^2\]

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

(B) \[sp^3\]

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

(D) II and IV

(A) II and IV

(B) I and III

(C) I and IV

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

(B) Liquids

(A) Solids

(D) gas and liquid

(C) gases

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

115. d-elements in the periodic table are:

(B) Located between 3th and 6th group

(A) Located between 3th and 12th group

(D) There is no current answer

(C) Randomly spread

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

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

(D) There is no correct answer

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

154. Select the monosaccharide (s).

(A) sucrose

(C) glucose

(D) fructose and glucose

(B) fructose

120. Amines are

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

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

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

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

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

(B) They contain benzene ring

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

(D) They are not cyclic compounds

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

171. the equilibrium constant of endothermic reaction depends on:

(C) changes in product concentrations

(B) changes in reactant concentrations

(D) there is no correct answer

(A) changes in temperature

213. Peptide bonds can be classified as:

(C) Amides

(A) Amines

(D) Esters

(B) Carboxylic acids

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

(A) I and IV

(C) I, II and III

(D) III and IV

212. Which reactionis NOT possible with acetic acid?

\[CH_3COOH + NH_3→\]

(B) \[CH_3COOH + NaCl→\]

(C) \[CH_3COOH + Na_2CO_3→\]

(A) \[CH_3COOH + NaOH→\]

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

(D) is always zero

(C) is always positive

(A) depends on the allotropic form

(B) is always negative

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

(A) ketones

(C) ethers

(B) maltose

(D) amides

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

(D) 4σ-bonds

(C) 1π-bonds and 3σ-bonds

(A) 4π-bonds

(B) 4π-bonds and 2σ-bonds

233. \[H_2O\] is

(A) base

(D) Lewis acid

(B) acid

(C) amphoric substance

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

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

(C) always decreases

(B) does not changes

(D) slightly decreases only between gases

(A) always increases

131. Which compound can form hydrogen chemical bonds:

(D) dihydrogen monoxide

(A) methane

(B) nitrogen

(C) carbon monoxide

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

(C) 3

(A) 1

(D) 4

(B) 2

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

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

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

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

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

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

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

(D) There is no correct answer

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

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

(C) The atomic mass of the element

175. The oxidation of ethanol produces _______.

(C) citric acid

(B) formic acid

(A) acetic acid

(D) lactic acid

139. The general formula fo an ether is

(D) R-OH

(B) R-CO-R

(A) R-O-R

(C) R-COOH

193. The equilibrium constant:

(C) depend on changes in product concentrations

(A) can be changed at constant temperature

(D) there is no correct answer

(B) depend on changes in reactant concentrations

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

(C) D-Mannose

(A) D-Sucrose

(B) D-Glucose

(D) D-Ribose

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

(D) an aldehyde

(A) a hydrocarbon

(B) an ester

(C) an ether

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

(B) \[sp_3\]

(A) \[sp\]

(C) \[sp_2\]

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

226. Markovnikov's rule is a reaction of

(B) substitution

(C) radical polymerization

(A) addition

(D) oxidation

136. I, 2-dichlorethene has

(A) no isomers

(C) chain isomers

(B) cis-trans isomers

(D) positional isomers

225. The name for the compound with the formula

\[CH_3CH_2CH_2CH_2OH\] is

(D) pentanol

(C) butanol

(A) propanol

(B) propane

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

232. The oxidation number of C in

\[H_2C_2O_4\] is?

(B) +2

(D) -2

(A) +3

(C) +4

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

(A) prticipation reaction

(C) acid-base reaction

(D) precipitation and rebox reaction

(B) redox reaction

203. What is the name of the compound below:

(A) 2,4-methylbutene

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

(B) 2,5-dimethylpentane

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

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

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

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

125. The general formula for an ether is

(C) R-COOH

(B) R-CO-R

(D) R-OH

(A) R-O-R

137. Pentane has

(D) one chain isomers

(B) four chain isomers

(C) two chain isomers

(A) three chain isomers

140. _________________ is a disaccharide

(C) sucrose

(A) glucose

(B) galactose

(D) ribose

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;

(C) II and III;

(D) II and IV

(B) I and IV;

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

\[CH_3CH_2CH_2CH_2OH\]

(A)

(B)

(C)

(D)

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

(C) ketone

(B) amide

(D) aldehyde

(A) amine

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

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

(D) glycerine

(B) phenol

(C) methanal

(A) methanone

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

(C) an alkane

(D) a ketone

(B) an aldehyde

(A) an alcohol

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

(B) phenol

(D) glycerine

(C) methanal

(A) methanone

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

Litmus Colour Reaction with Zn

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

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

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

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

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

(A) does not change

(B) always increases

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

(C) always decreases

202. In a redox reaction, there must be:

(B) A reducing agent and no oxidizing agent

(C) A reducing agent and an oxidizing agent

(A) An oxidizing agent and no reducing agent

(D) No reducing or oxidizing agent

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

(C) 3

(A) 1

(B) 2

(D) 4

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

A.
B.
C.

D.

(C)

(A)

(B)

(D)

151. Which one correctly depicts a primary amine?

(B)

(A)

(D)

(C)

127. What is the correct classification for this alcohol?

(D) quaternary

(C) tertiary

(B) secondary

(A) primary

227. How many isomers are possible for dibromobenzene:

(A) 4

(C) 3

(B) 2

(D) 1