Random chemistry FINAL

Welcome to your Random chemistry FINAL

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

(D) there is not correct answer

(C) reactant, if they are in gas state

(B) reaction products

(A) reactants

195. The electrons in the first electron shell have:

(A) the lowest energy in the atom

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

(D) the same amount of energy as the protons

(B) have no energy

151. Which one correctly depicts a primary amine?

(B)

(D)

(C)

(A)

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

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

(C) (CH3CO)2O

(A) (CH3)2CCl

(B) CH3COCl

(D) CH3CO2CH2CH3

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

136. I, 2-dichlorethene has

(C) chain isomers

(B) cis-trans isomers

(A) no isomers

(D) positional isomers

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

(B) I and III

(A) II and IV

(C) I and IV

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

(C) ketones

(B) asters

(D) aldehydes

(A) alcohol

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

162. The compounds CH3COCH2CH2CH3 and CH3CH2CH2CH2CH2OH are:

(B) chain isomers

(A) positional isomers

(D) are homologues

(C) are not isomers

209. Which compound undergoes the substitution reaction with NaCN?

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

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

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

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

233. \[H_2O\] is

(B) acid

(C) amphoric substance

(A) base

(D) Lewis acid

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

(B) A1, A2

(A) A1, B2

(D) B1, A2

(C) B1, B2

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

(C) reactants, if they are in gas state

(A) reactants

(B) reactionproducts

(D) there is not correct answer

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

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

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

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

(C) fructose is a monoshaccaride and glucose is polysaccharide

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

127. What is the correct classification for this alcohol?

(D) quaternary

(A) primary

(C) tertiary

(B) secondary

221. Sugars are examples of what type of molecule?

(A) proteins

(D) acids

(C) salts

(B) carbohydrates

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

(C) at same distance between the two atoms

(A) closer to more electronegative atom

(B) closer to more electropositive atom

(D) there is no correct answer

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

(B) \[sp_3\]

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

(C) \[sp_2\]

(A) \[sp\]

179. Which structure below represents a ketone?

(A)

(D)

(C)

(B)

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

(D) gas and liquid

(C) gases

(B) Liquids

(A) Solids

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

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

(D) aldehyde

(B) amide

(A) amine

(C) ketone

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

(B) maltose

(C) ethers

(D) amides

(A) ketones

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

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

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

(B) 1, 2 and 4

(A) 2,4 and 5

(D) 4 and 6

(C) 3 and 5

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

\[Na_2S\] is

(C) \[Na_2S+2H_2O⇄2NaOH+H_2S\]

(A) \[Na_2 ⇄ 2 Na^++S^{2-}\]

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

(B) \[S^{2-}+H_2O⇄OH^-+ HS^+\]

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

227. How many isomers are possible for dibromobenzene:

(A) 4

(B) 2

(D) 1

(C) 3

148. When temperature is increased the rate increases:

(C) for all chemical reactions

(D) there is not correct answer

(B) only for chemical reactions between gases

(A) only for chemical reactions between solids

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

(D) KCl

(A) KNO3

(B) KClO4

(C) CH3COOK

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

(B) Chlorine

(D) Sulphur

(A) Iodine

(C) Nitrogen

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

(B) Ca(OH)2

(A) C5H5N

(D) NH4OH

(C) Al(OH)3

232. The oxidation number of C in

\[H_2C_2O_4\] is?

(A) +3

(D) -2

(B) +2

(C) +4

188. What are the possible oxidation states of sulphur:

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

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

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

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

131. Which compound can form hydrogen chemical bonds:

(C) carbon monoxide

(D) dihydrogen monoxide

(A) methane

(B) nitrogen

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

(B) 6

(D) 4

(A) 8

(C) 12

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

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

(C) I, II and III

(A) I and III

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

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

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

(D) there re not correct answer

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

(A) a hydrocarbon

(D) an aldehyde

(B) an ester

(C) an ether

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

(A) covalent

(B) peptide

(C) ionic

(D) hydrogen

200. Select the formula of potassium dichromate:

(B) \[KCr_2O_7\]

(C) \[KCr_2O_5\]

(A) \[K_2Cr_2O_7\]

(D) \[K2Cr_2O_4\]

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

(B) 2

(C) 3

(A) 1

(D) 4

120. Amines are

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

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

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

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

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

(B) \[sp^3\]

(A) \[sp\]

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

(C) \[sp^2\]

171. the equilibrium constant of endothermic reaction depends on:

(D) there is no correct answer

(C) changes in product concentrations

(B) changes in reactant concentrations

(A) changes in temperature

146. At equilibrium, concentration is of reactants:

(A) are highest

(C) are constant

(B) are lowest

(D) are variable

175. The oxidation of ethanol produces _______.

(C) citric acid

(A) acetic acid

(D) lactic acid

(B) formic acid

237. Atomic orbitals:

(D) there is no correct answer

(C) are three different types

(A) are the same number in electrons

(B) some of them have not assymetric shape

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

(D) II and III

(A) I and II

(B) III and IV

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

(B) I and III

(A) II and IV

(D) II and IV

118. The two molecules represented below are:

(C) alcohols

(D) carboxylic acids

(B) isotopes

(A) isomers

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

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

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

(B) They contain benzene ring

(D) They are not cyclic compounds

135. Which one of the following statement is true?

(C) Nonmetals tend to oxidize metals

(B) Metals do not react with nonmetals

(D) Nonmetals tend to reduce metals

(A) Metals tend to oxidize nonmetals

225. The name for the compound with the formula

\[CH_3CH_2CH_2CH_2OH\] is

(C) butanol

(B) propane

(D) pentanol

(A) propanol

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

A.
B.
C.

D.

(C)

(B)

(A)

(D)

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

(D) 4

(A) 1

(B) 2

(C) 3

212. Which reactionis NOT possible with acetic acid?

(B) \[CH_3COOH + NaCl→\]

(A) \[CH_3COOH + NaOH→\]

\[CH_3COOH + NH_3→\]

(C) \[CH_3COOH + Na_2CO_3→\]

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

(A) Carboxylic acid

(D) Ester

(C) Aldehyde

(B) Ketone

125. The general formula for an ether is

(B) R-CO-R

(D) R-OH

(A) R-O-R

(C) R-COOH

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

(B) molecular reaction

(C) ion exchange reaction

(A) chemical reaction

(D) there is not correct answer

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

169. The rate of a first order reaction is:

(B) highest in the final stages of the reaction

(C) slowest in the initial stages of the reaction

(D) slowest in the initial stages of the reaction

(A) highest in the initial stages of the reaction

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;

(A) I and III;

(D) II and IV

(C) II and III;

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

\[CH_3CH_2CH_2CH_2OH\]

(D)

(C)

(A)

(B)

147. The rate of a chemical reaction decreases if:

(B) the atmospheric pressure is kept constant

(D) some of the reaction products are gases

(C) The temperature is decreased

(A) the activation energy is decreased

228. The IUPAC name of para-dibromobenzene is:

(C) 1,3-dibromobenzene

(B) 1,4-dibromobenzene

(D) 4-dibromobenzene

(A) 1, 2-dibromobenzene

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

(B) is always negative

(C) is always positive

(A) depends on the allotropic form

(D) is always zero

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

(A) methanone

(D) glycerine

(C) methanal

(B) phenol

229. What is the IUPAC name of

\[CH_3CH_2CH_2CH(CH_3)CH_3\]?

(A) 2-methylhexane

(B) 4-methylhpentane

(C) 2-methylpentane

(D) 2-methylpentene

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

(A) O, I

(D) N, O

189. During an endothermic reaction:

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

(D) there is no correct answer

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

(A) there is no energy exchange

154. Select the monosaccharide (s).

(D) fructose and glucose

(B) fructose

(C) glucose

(A) sucrose

137. Pentane has

(D) one chain isomers

(A) three chain isomers

(C) two chain isomers

(B) four chain isomers

123. Select the monosaccharide (s).

(B) fructose

(D) fructose and glucose

(A) sucrose

(C) glucose

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

(D) 2-isohexanol

(C) 2-methyl-4-pentanol

(B) 4-methyl-2-pentanol

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

166. The thermal effect of chemical reaction represents:

(C) chemical nature of reaction products

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

(D) heat

(A) chemical nature of reactants

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

(C) is always positive

(D) is always zero

(A) depends on the allotropic form

(B) is always negative

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

197. The nucleus of an atom:

(D) does not contain neutrons

(C) has positive electric charge

(A) is neutral

(B) contains electrons

170. Equilibrium can be established during:

(D) hydrolysis of proteins

(A) hydrolysis of saccharose

(B) interaction between HCl and NaOH

(C) interaction between CH3COOH and NaOH

226. Markovnikov's rule is a reaction of

(C) radical polymerization

(B) substitution

(D) oxidation

(A) addition

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

(B) Two

(C) Four

(D) There is no correct answer

(A) One

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

(B) 2 and 3

(A) 1 and 3

(D) 3

(C) 2

163. C3H8O has

(A) three isomers

(D) only one isomer

(C) two isomers

(B) four isomers

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

(B) never changes

(D) there is no correct answer

(C) sometimes changes

(A) always changes

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

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

(D) There is no correct answer

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

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

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

(D) F

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

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

244. 1, 2-dichlorethene has

(C) chain isomers

(B) cis-trans isomers

(D) positional isomers

(A) no isomers

134. The principal difference between fructose ans glucose is that__________

(C) fructose is a monosaccharide and glucose is polysaccharide

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

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

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

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

(C) D-Mannose

(A) D-Sucrose

(D) D-Ribose

(B) D-Glucose

119. Which of these statements describes a condensation reaction?

(C) oxidation of ethanol to acetaldehyde

(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

144. The name of the compound

\[CH_3CH_2C(CH)_2CH_2CH_3\] is:

(A) 3,3-dimethylpentane

(B) 3,3-methylpentane

(C) 2-methyl-2-ethylburane

(D) 2-ethyl-2-methylburane

246. __________________is a monosaccharide

(A) sucrose

(B) maltose

(D) lactose

(C) glucose

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

(C) 2-chloro-5-nitrobenzoic acid

(A) 5-chloro-2-nitrobenzoic acid

(B) 3-nitro-6-chlorobenzoic acid

(D) 4-nitro-1.chlorobenzoic acid

247. Which of the statments are true?

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

(C) I and II

(A) I and III

(D) II and III

(B) III and IV

213. Peptide bonds can be classified as:

(D) Esters

(C) Amides

(A) Amines

(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

(D) III and IV

(A) I and IV

(B) II and IV

(C) I, II and III

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

(B) does not changes

(C) always decreases

(D) slightly decreases only between gases

(A) always increases

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

(B) redox reaction

(C) acid-base reaction

(A) prticipation reaction

(D) precipitation and rebox reaction

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

(C) ketone

(D) aldehyde

(B) amide

(A) amine

193. The equilibrium constant:

(A) can be changed at constant temperature

(B) depend on changes in reactant concentrations

(C) depend on changes in product concentrations

(D) there is no correct answer

140. _________________ is a disaccharide

(D) ribose

(B) galactose

(A) glucose

(C) sucrose

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

(D) 3-Chlorobutanal

(A) 2-Chloro-4-butanal

(C) 3-Chloro-4-butanal

(B) 2-Chlorobutan-4-al

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

(A) Butanoic acid

(B) Butan-1-ol

(D) Butan-2-ol

(C) Butan-2-one

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

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

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

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

(B) phenol

(C) methanal

(A) methanone

(D) glycerine

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

(D) Zinc oxide, copper oxide and oxygen

(C) Zinc oxide, copper oxide and sulfur dioxide

(B) Zinc oxide and copper oxide

(A) Zinc sulfate and copper

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

214. Which one correctly depicts a quaternary ammonium ion?

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

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

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

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

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

(C) ketones

(B) asters

(A) alcohol

(D) aldehydes

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

R-OH + RCOOH ->

(C) aldehyde

(A) ketone

(B) ether

(D) ester

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

(A) ketone

(C) amine

(B) ester

(D) amide

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

(A) an alcohol

(C) an alkane

(D) a ketone

(B) an aldehyde

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

(B) always decreases

(C) sometimes increases

(A) always increases

(D) does not change

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

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

(D) There is no correct answer

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

(C) gases

(D) gas and liquid

(B) liquids

(A) solids

181. Which of the following is alkane:

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

(D) \[C_5H_{10}\]

(A) \[C_6H_{14}\]

(B) \[C_6H_{12}\]

139. The general formula fo an ether is

(D) R-OH

(A) R-O-R

(C) R-COOH

(B) R-CO-R

194. The equilibrium constant:

(C) depend on changes in product concentrations

(B) depend on changes in reactant concentrations

(D) there is no correct answer

(A) can be changed at constant temperature

164. In which compound there is ionic chemical bond:

(C) KS

(D) H2S

(A) NO2

(B) HNO3

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

(C) alcohol and carboxylic acid

(B) amine and carboxylic acid

(D) alcohol and amine

(A) ester and amine

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

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

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

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

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

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

141. cis-trans isomerism is

(A) not observed in the cyclic compounds

(C) is the same as E/Z isomerism

(B) is a form of stereoisomerism

(D) possible for 1,2-dischlorethane

223. Aniline is a(n)

(D) primary aromatic amine

(A) aliphatic amine.

(C) heterocyclic amine

(B) secondary aromatic amine

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

Litmus Colour Reaction with Zn

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

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

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

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

239. Electron configuration of phosphorus is:

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

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

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

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

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

(C) 1π-bonds and 3σ-bonds

(D) 4σ-bonds

(B) 4π-bonds and 2σ-bonds

(A) 4π-bonds

132. Noble metals

(C) react with air but not react with water

(D) do not react with air and water

(A) react with air

(B) do not react with air

180. Which one of the following is alkyne?

(B) \[C_4H_8 \]

(A) \[C_4H_6\]

(D) \[C_5H_{12}\]

(C) \[C_4H_{10}\]

115. d-elements in the periodic table are:

(C) Randomly spread

(A) Located between 3th and 12th group

(B) Located between 3th and 6th group

(D) There is no current answer