Random chemistry FINAL

Welcome to your Random chemistry FINAL

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

(A) \[sp\]

(B) \[sp^3\]

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

(C) \[sp^2\]

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

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

R-OH + RCOOH ->

(D) ester

(B) ether

(C) aldehyde

(A) ketone

188. What are the possible oxidation states of sulphur:

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

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

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

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

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

\[CH_3CH_2CH_2CH_2OH\]

(C)

(D)

(A)

(B)

136. I, 2-dichlorethene has

(D) positional isomers

(B) cis-trans isomers

(C) chain isomers

(A) no isomers

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

(B) Zinc oxide and copper oxide

(C) Zinc oxide, copper oxide and sulfur dioxide

(D) Zinc oxide, copper oxide and oxygen

(A) Zinc sulfate and copper

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

(D) Sulphur

(A) Iodine

(B) Chlorine

(C) Nitrogen

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.

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

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

197. The nucleus of an atom:

(B) contains electrons

(D) does not contain neutrons

(C) has positive electric charge

(A) is neutral

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

(A) \[sp\]

(C) \[sp_2\]

(B) \[sp_3\]

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

(D) II and III

(B) III and IV

225. The name for the compound with the formula

\[CH_3CH_2CH_2CH_2OH\] is

(B) propane

(D) pentanol

(C) butanol

(A) propanol

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

\[HNO_2 +\,→\,NO + I3 -\]

(D) N, O

(A) O, I

(B) I-, N

(C) N, I-

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

148. When temperature is increased the rate increases:

(D) there is not correct answer

(C) for all chemical reactions

(B) only for chemical reactions between gases

(A) only for chemical reactions between solids

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

151. Which one correctly depicts a primary amine?

(A)

(B)

(C)

(D)

194. 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

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

(D) Butan-2-ol

(C) Butan-2-one

(A) Butanoic acid

(B) Butan-1-ol

132. Noble metals

(A) react with air

(C) react with air but not react with water

(D) do not react with air and water

(B) do not react with air

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

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

(C) primary alcohol

(A) quaternary alcohol

(D) secondary alcohol

(B) tertiary alcohol

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

(A) II and IV

(C) I and IV

(D) II and IV

(B) I and III

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

(C) I and IV

(B) I and III

(D) II and IV

181. Which of the following is alkane:

(A) \[C_6H_{14}\]

(D) \[C_5H_{10}\]

(B) \[C_6H_{12}\]

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

189. During an endothermic reaction:

(D) there is no correct answer

(A) there is no energy exchange

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

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

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

\[Br_2\]

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

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

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

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

125. The general formula for an ether is

(D) R-OH

(B) R-CO-R

(C) R-COOH

(A) R-O-R

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

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

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

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

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

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

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

(B) always increases

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

(C) always decreases

(A) does not change

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

(B) an aldehyde

(C) an alkane

(A) an alcohol

(D) a ketone

244. 1, 2-dichlorethene has

(A) no isomers

(D) positional isomers

(B) cis-trans isomers

(C) chain isomers

228. The IUPAC name of para-dibromobenzene is:

(D) 4-dibromobenzene

(A) 1, 2-dibromobenzene

(C) 1,3-dibromobenzene

(B) 1,4-dibromobenzene

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

(D) They are not cyclic compounds

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

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

(B) They contain benzene ring

123. Select the monosaccharide (s).

(C) glucose

(A) sucrose

(B) fructose

(D) fructose and glucose

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

(B) Pentan-2-o1

(A) Pentan-1-ol

(C) 2-Methybutan-2-ol

232. The oxidation number of C in

\[H_2C_2O_4\] is?

(D) -2

(A) +3

(B) +2

(C) +4

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

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

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

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

(D) There is not correct answer

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

(D) there is not correct answer

(A) reactants

(B) reactionproducts

(C) reactants, if they are in gas state

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

(C) 3

(A) 1

(B) 2

(D) 4

140. _________________ is a disaccharide

(A) glucose

(C) sucrose

(B) galactose

(D) ribose

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

209. Which compound undergoes the substitution reaction with NaCN?

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

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

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

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

203. What is the name of the compound below:

(A) 2,4-methylbutene

(B) 2,5-dimethylpentane

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

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

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

164. In which compound there is ionic chemical bond:

(C) KS

(A) NO2

(D) H2S

(B) HNO3

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

(C) methanal

(A) methanone

(D) glycerine

(B) phenol

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

(D) amide

(C) amine

(B) ester

(A) ketone

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

(B) is always negative

(A) depends on the allotropic form

(C) is always positive

(D) is always zero

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

(B) 6

(A) 8

(C) 12

(D) 4

223. Aniline is a(n)

(C) heterocyclic amine

(D) primary aromatic amine

(B) secondary aromatic amine

(A) aliphatic amine.

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

\[Na_2S\] is

(A) \[Na_2 ⇄ 2 Na^++S^{2-}\]

(B) \[S^{2-}+H_2O⇄OH^-+ HS^+\]

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

(C) \[Na_2S+2H_2O⇄2NaOH+H_2S\]

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

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

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

(D) F

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

115. d-elements in the periodic table are:

(C) Randomly spread

(D) There is no current answer

(B) Located between 3th and 6th group

(A) Located between 3th and 12th group

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

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

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

119. Which of these statements describes a condensation reaction?

(D) hydrolysis of an ester

(A) addition of H2O to a double bond

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

(C) oxidation of ethanol to acetaldehyde

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

(C) always decreases

(B) does not changes

(A) always increases

(D) slightly decreases only between gases

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

(B) 2

(D) 4

(A) 1

(C) 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;

(A) 2,4 and 5

(B) 1, 2 and 4

(D) 4 and 6

(C) 3 and 5

214. Which one correctly depicts a quaternary ammonium ion?

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

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

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

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

118. The two molecules represented below are:

(A) isomers

(C) alcohols

(B) isotopes

(D) carboxylic acids

171. the equilibrium constant of endothermic reaction depends on:

(C) changes in product concentrations

(B) changes in reactant concentrations

(A) changes in temperature

(D) there is no correct answer

226. Markovnikov's rule is a reaction of

(A) addition

(B) substitution

(C) radical polymerization

(D) oxidation

212. Which reactionis NOT possible with acetic acid?

(C) \[CH_3COOH + Na_2CO_3→\]

\[CH_3COOH + NH_3→\]

(B) \[CH_3COOH + NaCl→\]

(A) \[CH_3COOH + NaOH→\]

141. cis-trans isomerism is

(A) not observed in the cyclic compounds

(C) is the same as E/Z isomerism

(D) possible for 1,2-dischlorethane

(B) is a form of stereoisomerism

213. Peptide bonds can be classified as:

(C) Amides

(A) Amines

(B) Carboxylic acids

(D) Esters

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

(A) 1 and 3

(B) 2 and 3

(D) 3

(C) 2

169. The rate of a first order reaction is:

(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

(B) highest in the final stages of the reaction

202. In a redox reaction, there must be:

(A) An oxidizing agent and no reducing agent

(C) A reducing agent and an oxidizing agent

(D) No reducing or oxidizing agent

(B) A reducing agent and no oxidizing agent

233. \[H_2O\] is

(D) Lewis acid

(B) acid

(C) amphoric substance

(A) base

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

(A) 5-chloro-2-nitrobenzoic acid

(C) 2-chloro-5-nitrobenzoic acid

(D) 4-nitro-1.chlorobenzoic acid

(B) 3-nitro-6-chlorobenzoic acid

235. The isotopes of a chemical element have:

(D) there is not correct answer

(A) the same number in periodic table

(C) different number of electrons in the electron shell

(B) the same mass number

135. Which one of the following statement is true?

(C) Nonmetals tend to oxidize metals

(B) Metals do not react with nonmetals

(A) Metals tend to oxidize nonmetals

(D) Nonmetals tend to reduce metals

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

(C) ketones

(D) aldehydes

(A) alcohol

(B) asters

144. The name of the compound

\[CH_3CH_2C(CH)_2CH_2CH_3\] is:

(C) 2-methyl-2-ethylburane

(A) 3,3-dimethylpentane

(B) 3,3-methylpentane

(D) 2-ethyl-2-methylburane

166. The thermal effect of chemical reaction represents:

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

(A) chemical nature of reactants

(D) heat

(C) chemical nature of reaction products

127. What is the correct classification for this alcohol?

(A) primary

(B) secondary

(D) quaternary

(C) tertiary

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

Litmus Colour Reaction with Zn

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

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

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

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

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

(C) 3-Chloro-4-butanal

(B) 2-Chlorobutan-4-al

(D) 3-Chlorobutanal

(A) 2-Chloro-4-butanal

146. At equilibrium, concentration is of reactants:

(B) are lowest

(C) are constant

(D) are variable

(A) are highest

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

(C) reaction products

(B) reactants, if they are in gas state

(A) reactants

(D) there is no correct answer

200. Select the formula of potassium dichromate:

(C) \[KCr_2O_5\]

(A) \[K_2Cr_2O_7\]

(B) \[KCr_2O_7\]

(D) \[K2Cr_2O_4\]

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

(C) ketone

(A) amine

(D) aldehyde

(B) amide

180. Which one of the following is alkyne?

(D) \[C_5H_{12}\]

(C) \[C_4H_{10}\]

(B) \[C_4H_8 \]

(A) \[C_4H_6\]

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

(D) Add 3H2O to the right

(A) Add 2e- to the right

(C) It is balanced

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

134. The principal difference between fructose ans glucose is that__________

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

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

(C) fructose is a monosaccharide and glucose is polysaccharide

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

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

(A) solids

(B) liquids

(C) gases

(D) gas and liquid

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

(D) there is not correct answer

(B) reaction products

(C) reactant, if they are in gas state

(A) reactants

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

(A) D-Sucrose

(C) D-Mannose

(D) D-Ribose

(B) D-Glucose

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

(A) (CH3)2CCl

(C) (CH3CO)2O

(D) CH3CO2CH2CH3

(B) CH3COCl

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

(B) amide

(D) aldehyde

(A) amine

(C) ketone

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

(B) Two

(D) There is no correct answer

(A) One

(C) Four

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

(A) 4π-bonds

(B) 4π-bonds and 2σ-bonds

(C) 1π-bonds and 3σ-bonds

(D) 4σ-bonds

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

(A) covalent

(D) hydrogen

(B) peptide

(C) ionic

175. The oxidation of ethanol produces _______.

(B) formic acid

(A) acetic acid

(D) lactic acid

(C) citric acid

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

(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

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

(B) molecular reaction

(C) ion exchange reaction

(D) there is not correct answer

(A) chemical reaction

163. C3H8O has

(A) three isomers

(D) only one isomer

(C) two isomers

(B) four isomers

154. Select the monosaccharide (s).

(D) fructose and glucose

(A) sucrose

(B) fructose

(C) glucose

162. The compounds CH3COCH2CH2CH3 and CH3CH2CH2CH2CH2OH are:

(B) chain isomers

(D) are homologues

(A) positional isomers

(C) are not isomers

193. 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

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

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

(B) maltose

(D) amides

(C) ethers

(A) ketones

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

(B) asters

(D) aldehydes

(A) alcohol

(C) ketones

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

(D) I, III and IV

(A) I and III

(C) I, II and III

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

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

(D) There is no correct answer

(C) The atomic mass of the element

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

(B) KClO4

(D) KCl

(C) CH3COOK

(A) KNO3

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;

(D) II and IV

(B) I and IV;

(A) I and III;

237. Atomic orbitals:

(C) are three different types

(B) some of them have not assymetric shape

(A) are the same number in electrons

(D) there is no correct answer

195. The electrons in the first electron shell have:

(D) the same amount of energy as the protons

(B) have no energy

(A) the lowest energy in the atom

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

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

(D) gas and liquid

(A) Solids

(C) gases

(B) Liquids

227. How many isomers are possible for dibromobenzene:

(B) 2

(D) 1

(C) 3

(A) 4

239. Electron configuration of phosphorus is:

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

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

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

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

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

(C) an ether

(B) an ester

(D) an aldehyde

(A) a hydrocarbon

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

A.
B.
C.

D.

(C)

(D)

(A)

(B)

139. The general formula fo an ether is

(C) R-COOH

(B) R-CO-R

(D) R-OH

(A) R-O-R

179. Which structure below represents a ketone?

(B)

(A)

(C)

(D)

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

(B) phenol

(A) methanone

(D) glycerine

(C) methanal

229. What is the IUPAC name of

\[CH_3CH_2CH_2CH(CH_3)CH_3\]?

(D) 2-methylpentene

(C) 2-methylpentane

(B) 4-methylhpentane

(A) 2-methylhexane

137. Pentane has

(A) three chain isomers

(B) four chain isomers

(C) two chain isomers

(D) one chain isomers

131. Which compound can form hydrogen chemical bonds:

(D) dihydrogen monoxide

(A) methane

(B) nitrogen

(C) carbon monoxide

170. Equilibrium can be established during:

(D) hydrolysis of proteins

(C) interaction between CH3COOH and NaOH

(B) interaction between HCl and NaOH

(A) hydrolysis of saccharose

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

147. The rate of a chemical reaction decreases if:

(A) the activation energy is decreased

(C) The temperature is decreased

(D) some of the reaction products are gases

(B) the atmospheric pressure is kept constant

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

(D) there is no correct answer

(C) at same distance between the two atoms

(A) closer to more electronegative atom

(B) closer to more electropositive atom

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

(C) I and II

(B) III and IV

(D) II and III

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

(C) Aldehyde

(D) Ester

(B) Ketone

(A) Carboxylic acid

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

(D) alcohol and amine

(C) alcohol and carboxylic acid

(A) ester and amine

(B) amine and carboxylic acid

221. Sugars are examples of what type of molecule?

(B) carbohydrates

(A) proteins

(C) salts

(D) acids

246. __________________is a monosaccharide

(D) lactose

(C) glucose

(A) sucrose

(B) maltose