Random chemistry FINAL

Welcome to your Random chemistry FINAL

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

(A) does not change

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

(C) always decreases

(B) always increases

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

(A) 1

(B) 2

(C) 3

(D) 4

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

(D) glycerine

(A) methanone

(B) phenol

(C) methanal

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

(B) 3-nitro-6-chlorobenzoic acid

(A) 5-chloro-2-nitrobenzoic acid

(D) 4-nitro-1.chlorobenzoic acid

(C) 2-chloro-5-nitrobenzoic acid

144. The name of the compound

\[CH_3CH_2C(CH)_2CH_2CH_3\] is:

(A) 3,3-dimethylpentane

(D) 2-ethyl-2-methylburane

(B) 3,3-methylpentane

(C) 2-methyl-2-ethylburane

194. The equilibrium constant:

(C) depend on changes in product concentrations

(D) there is no correct answer

(A) can be changed at constant temperature

(B) depend on changes in reactant concentrations

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

(B) liquids

(C) gases

(A) solids

(D) gas and liquid

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

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

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

(D) there re not correct answer

189. During an endothermic reaction:

(D) there is no correct answer

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

(A) there is no energy exchange

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

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

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

(C) The atomic mass of the element

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

(D) There is no correct answer

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

Litmus Colour Reaction with Zn

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

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

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

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

223. Aniline is a(n)

(D) primary aromatic amine

(A) aliphatic amine.

(B) secondary aromatic amine

(C) heterocyclic amine

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

228. The IUPAC name of para-dibromobenzene is:

(B) 1,4-dibromobenzene

(C) 1,3-dibromobenzene

(A) 1, 2-dibromobenzene

(D) 4-dibromobenzene

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

(B) \[sp^3\]

(A) \[sp\]

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

(C) \[sp^2\]

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

118. The two molecules represented below are:

(C) alcohols

(B) isotopes

(D) carboxylic acids

(A) isomers

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

131. Which compound can form hydrogen chemical bonds:

(C) carbon monoxide

(B) nitrogen

(A) methane

(D) dihydrogen monoxide

202. In a redox reaction, there must be:

(B) A reducing agent and no oxidizing agent

(D) No reducing or oxidizing agent

(A) An oxidizing agent and no reducing agent

(C) A reducing agent and an oxidizing agent

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

(B) tertiary alcohol

(A) quaternary alcohol

(C) primary alcohol

(D) secondary alcohol

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

(C) ketone

(D) aldehyde

(A) amine

(B) amide

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

154. Select the monosaccharide (s).

(D) fructose and glucose

(C) glucose

(A) sucrose

(B) fructose

151. Which one correctly depicts a primary amine?

(B)

(C)

(D)

(A)

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

(C) I and II

(A) I and III

(B) III and IV

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

(A) prticipation reaction

(B) redox reaction

(D) precipitation and rebox reaction

(C) acid-base reaction

227. How many isomers are possible for dibromobenzene:

(B) 2

(A) 4

(D) 1

(C) 3

119. Which of these statements describes a condensation reaction?

(D) hydrolysis of an ester

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

(A) addition of H2O to a double bond

(C) oxidation of ethanol to acetaldehyde

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

(C) at same distance between the two atoms

(B) closer to more electropositive atom

(A) closer to more electronegative atom

(D) there is no correct answer

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

(D) there is not correct answer

(C) ion exchange reaction

(B) molecular reaction

(A) chemical reaction

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

(B) \[sp_3\]

(C) \[sp_2\]

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

(A) \[sp\]

132. Noble metals

(B) do not react with air

(C) react with air but not react with water

(A) react with air

(D) do not react with air and water

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

(B) 2 and 3

(D) 3

(C) 2

(A) 1 and 3

200. Select the formula of potassium dichromate:

(B) \[KCr_2O_7\]

(C) \[KCr_2O_5\]

(A) \[K_2Cr_2O_7\]

(D) \[K2Cr_2O_4\]

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

(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

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

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

(B) Butan-1-ol

(C) Butan-2-one

(D) Butan-2-ol

(A) Butanoic acid

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

(D) amide

(C) amine

(A) ketone

(B) ester

197. The nucleus of an atom:

(C) has positive electric charge

(A) is neutral

(D) does not contain neutrons

(B) contains electrons

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

(A) 2,4 and 5

(B) 1, 2 and 4

(D) 4 and 6

212. Which reactionis NOT possible with acetic acid?

\[CH_3COOH + NH_3→\]

(B) \[CH_3COOH + NaCl→\]

(A) \[CH_3COOH + NaOH→\]

(C) \[CH_3COOH + Na_2CO_3→\]

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

(D) III and IV

(B) II and IV

(A) I and IV

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

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

(C) ketones

(D) aldehydes

(A) alcohol

(B) asters

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

(A) II and IV

(B) I and III

(D) II and IV

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

(D) there is not correct answer

(B) reaction products

(A) reactants

(C) reactant, if they are in gas state

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

(C) an ether

(D) an aldehyde

(B) an ester

(A) a hydrocarbon

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

(D) F

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

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

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

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.

(B) I and IV;

(C) II and III;

(D) II and IV

(A) I and III;

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

\[CH_3CH_2CH_2CH_2OH\]

(B)

(C)

(A)

(D)

147. The rate of a chemical reaction decreases if:

(C) The temperature is decreased

(D) some of the reaction products are gases

(A) the activation energy is decreased

(B) the atmospheric pressure is kept constant

136. I, 2-dichlorethene has

(D) positional isomers

(A) no isomers

(C) chain isomers

(B) cis-trans isomers

213. Peptide bonds can be classified as:

(C) Amides

(B) Carboxylic acids

(D) Esters

(A) Amines

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

\[HNO_2 +\,→\,NO + I3 -\]

(B) I-, N

(C) N, I-

(A) O, I

(D) N, O

133. Aqua regia is:

(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

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

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

209. Which compound undergoes the substitution reaction with NaCN?

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

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

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

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

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

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

R-OH + RCOOH ->

(D) ester

(A) ketone

(B) ether

(C) aldehyde

233. \[H_2O\] is

(D) Lewis acid

(C) amphoric substance

(B) acid

(A) base

120. Amines are

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

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

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

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

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

(A) A1, B2

(B) A1, A2

(D) B1, A2

(C) B1, B2

137. Pentane has

(C) two chain isomers

(A) three chain isomers

(D) one chain isomers

(B) four chain isomers

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

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

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

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

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

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

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

(B) amine and carboxylic acid

(D) alcohol and amine

(C) alcohol and carboxylic acid

(A) ester and amine

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

(A) C5H5N

(B) Ca(OH)2

(D) NH4OH

(C) Al(OH)3

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

\[Br_2\]

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

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

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

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

123. Select the monosaccharide (s).

(B) fructose

(A) sucrose

(C) glucose

(D) fructose and glucose

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

(C) reactants, if they are in gas state

(B) reactionproducts

(D) there is not correct answer

(A) reactants

226. Markovnikov's rule is a reaction of

(B) substitution

(D) oxidation

(A) addition

(C) radical polymerization

164. In which compound there is ionic chemical bond:

(C) KS

(B) HNO3

(D) H2S

(A) NO2

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

(A) alcohol

(B) asters

(C) ketones

(D) aldehydes

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

(D) hydrogen

(B) peptide

(C) ionic

(A) covalent

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

(C) I and IV

(B) I and III

(A) II and IV

(D) II and IV

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

(B) They contain benzene ring

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

(D) They are not cyclic compounds

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

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

\[Cr_2O_7{^{2-}} → 2Cr^{3+}\] ?

(A) add 7 H2O to the left

(C) Multiply through by 2

(B) add 7 H2O to the right

(D) Add 8 e to the left

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

(D) 4

(B) 6

(C) 12

(A) 8

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

(B) 2

(C) 3

(A) 1

(D) 4

135. Which one of the following statement is true?

(B) Metals do not react with nonmetals

(C) Nonmetals tend to oxidize metals

(A) Metals tend to oxidize nonmetals

(D) Nonmetals tend to reduce metals

237. Atomic orbitals:

(B) some of them have not assymetric shape

(C) are three different types

(A) are the same number in electrons

(D) there is no correct answer

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

(A) Iodine

(B) Chlorine

(D) Sulphur

(C) Nitrogen

193. 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

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

(A) (CH3)2CCl

(D) CH3CO2CH2CH3

(C) (CH3CO)2O

(B) CH3COCl

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

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

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

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

(D) There is not correct answer

179. Which structure below represents a ketone?

(B)

(A)

(C)

(D)

163. C3H8O has

(B) four isomers

(A) three isomers

(D) only one isomer

(C) two isomers

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

(B) an aldehyde

(A) an alcohol

(D) a ketone

(C) an alkane

229. What is the IUPAC name of

\[CH_3CH_2CH_2CH(CH_3)CH_3\]?

(A) 2-methylhexane

(D) 2-methylpentene

(C) 2-methylpentane

(B) 4-methylhpentane

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

(D) aldehyde

(C) ketone

(A) amine

(B) amide

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

(A) always increases

(C) always decreases

(B) does not changes

(D) slightly decreases only between gases

139. The general formula fo an ether is

(C) R-COOH

(D) R-OH

(B) R-CO-R

(A) R-O-R

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

(C) ethers

(B) maltose

(A) ketones

(D) amides

246. __________________is a monosaccharide

(A) sucrose

(D) lactose

(B) maltose

(C) glucose

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

(A) One

(B) Two

(D) There is no correct answer

(C) Four

180. Which one of the following is alkyne?

(C) \[C_4H_{10}\]

(D) \[C_5H_{12}\]

(A) \[C_4H_6\]

(B) \[C_4H_8 \]

214. Which one correctly depicts a quaternary ammonium ion?

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

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

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

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

235. The isotopes of a chemical element have:

(A) the same number in periodic table

(C) different number of electrons in the electron shell

(D) there is not correct answer

(B) the same mass number

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

(A) methanone

(B) phenol

(D) glycerine

(C) methanal

175. The oxidation of ethanol produces _______.

(C) citric acid

(A) acetic acid

(B) formic acid

(D) lactic acid

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

(A) Solids

(D) gas and liquid

(B) Liquids

(C) gases

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

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

\[Na_2S\] is

(C) \[Na_2S+2H_2O⇄2NaOH+H_2S\]

(B) \[S^{2-}+H_2O⇄OH^-+ HS^+\]

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

(A) \[Na_2 ⇄ 2 Na^++S^{2-}\]

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

(B) III and IV

(C) I and II

(D) II and III

162. The compounds CH3COCH2CH2CH3 and CH3CH2CH2CH2CH2OH are:

(A) positional isomers

(C) are not isomers

(D) are homologues

(B) chain isomers

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

A.
B.
C.

D.

(A)

(D)

(B)

(C)

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

125. The general formula for an ether is

(B) R-CO-R

(A) R-O-R

(D) R-OH

(C) R-COOH

140. _________________ is a disaccharide

(D) ribose

(A) glucose

(C) sucrose

(B) galactose

225. The name for the compound with the formula

\[CH_3CH_2CH_2CH_2OH\] is

(A) propanol

(D) pentanol

(B) propane

(C) butanol

171. the equilibrium constant of endothermic reaction depends on:

(B) changes in reactant concentrations

(A) changes in temperature

(D) there is no correct answer

(C) changes in product concentrations

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

146. At equilibrium, concentration is of reactants:

(D) are variable

(A) are highest

(C) are constant

(B) are lowest

195. The electrons in the first electron shell have:

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

(B) have no energy

(A) the lowest energy in the atom

(D) the same amount of energy as the protons

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

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

(A) I and III

(D) I, III and IV

232. The oxidation number of C in

\[H_2C_2O_4\] is?

(D) -2

(A) +3

(C) +4

(B) +2

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

(D) D-Ribose

(A) D-Sucrose

(C) D-Mannose

(B) D-Glucose

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

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

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

(B) Zinc oxide and copper oxide

(D) Zinc oxide, copper oxide and oxygen

(A) Zinc sulfate and copper

(C) Zinc oxide, copper oxide and sulfur dioxide

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

(A) KNO3

(B) KClO4

(C) CH3COOK

(D) KCl

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

(A) depends on the allotropic form

(B) is always negative

(D) is always zero

(C) is always positive

239. Electron configuration of phosphorus is:

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

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

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

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

127. What is the correct classification for this alcohol?

(B) secondary

(A) primary

(C) tertiary

(D) quaternary

141. cis-trans isomerism is

(D) possible for 1,2-dischlorethane

(B) is a form of stereoisomerism

(C) is the same as E/Z isomerism

(A) not observed in the cyclic compounds

221. Sugars are examples of what type of molecule?

(D) acids

(A) proteins

(B) carbohydrates

(C) salts

134. The principal difference between fructose ans glucose is that__________

(C) fructose is a monosaccharide and glucose is polysaccharide

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

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

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

181. Which of the following is alkane:

(A) \[C_6H_{14}\]

(B) \[C_6H_{12}\]

(D) \[C_5H_{10}\]

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

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

(B) Ketone

(D) Ester

(A) Carboxylic acid

(C) Aldehyde

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

(D) 3-Chlorobutanal

(C) 3-Chloro-4-butanal

(B) 2-Chlorobutan-4-al

(A) 2-Chloro-4-butanal

244. 1, 2-dichlorethene has

(B) cis-trans isomers

(C) chain isomers

(D) positional isomers

(A) no isomers

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

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

(C) 2-Methybutan-2-ol

(B) Pentan-2-o1

(A) Pentan-1-ol

(D) 1-methylcyclohexam-1-ol

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

(A) always changes

(C) sometimes changes

(D) there is no correct answer

(B) never changes

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

(C) It is balanced

(B) Add 2e- to the left

(A) Add 2e- to the right