Random chemistry FINAL

Welcome to your Random chemistry FINAL

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

(B) reactants, if they are in gas state

(C) reaction products

(D) there is no correct answer

(A) reactants

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

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

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

(C) 2-methyl-4-pentanol

(B) 4-methyl-2-pentanol

(D) 2-isohexanol

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

(B) amide

(D) aldehyde

(A) amine

(C) ketone

244. 1, 2-dichlorethene has

(C) chain isomers

(A) no isomers

(B) cis-trans isomers

(D) positional isomers

139. The general formula fo an ether is

(C) R-COOH

(A) R-O-R

(D) R-OH

(B) R-CO-R

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

\[Cr_2O_7{^{2-}} → 2Cr^{3+}\] ?

(D) Add 8 e to the left

(B) add 7 H2O to the right

(C) Multiply through by 2

(A) add 7 H2O to the left

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

(C) amine

(A) ketone

(B) ester

(D) amide

169. The rate of a first order reaction is:

(D) 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

(C) slowest in the initial stages of the reaction

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

(C) ketones

(D) aldehydes

(A) alcohol

(B) asters

137. Pentane has

(A) three chain isomers

(C) two chain isomers

(D) one chain isomers

(B) four chain isomers

232. The oxidation number of C in

\[H_2C_2O_4\] is?

(D) -2

(A) +3

(C) +4

(B) +2

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

(A) Solids

(B) Liquids

(D) gas and liquid

(C) gases

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

(D) D-Ribose

(C) D-Mannose

(B) D-Glucose

(A) D-Sucrose

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

(A) ketones

(B) maltose

(C) ethers

(D) amides

154. Select the monosaccharide (s).

(A) sucrose

(D) fructose and glucose

(C) glucose

(B) fructose

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

(C) Zinc oxide, copper oxide and sulfur dioxide

(A) Zinc sulfate and copper

(B) Zinc oxide and copper oxide

(D) Zinc oxide, copper oxide and oxygen

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

(B) an aldehyde

(C) an alkane

(D) a ketone

(A) an alcohol

247. Which of the statments are true?

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

(B) III and IV

(D) II and III

(C) I and II

(A) I and III

235. The isotopes of a chemical element have:

(C) different number of electrons in the electron shell

(D) there is not correct answer

(B) the same mass number

(A) the same number in periodic table

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

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;

(C) II and III;

(D) II and IV

197. The nucleus of an atom:

(D) does not contain neutrons

(B) contains electrons

(C) has positive electric charge

(A) is neutral

134. The principal difference between fructose ans glucose is that__________

(C) fructose is a monosaccharide and glucose is polysaccharide

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

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

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

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

(A) 1

(D) 4

(B) 2

(C) 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

(A) I and IV

(D) III and IV

(C) I, II and III

(B) II and IV

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

(B) reaction products

(A) reactants

(C) reactant, if they are in gas state

(D) there is not correct answer

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

(B) 3-nitro-6-chlorobenzoic acid

(C) 2-chloro-5-nitrobenzoic acid

(D) 4-nitro-1.chlorobenzoic acid

(A) 5-chloro-2-nitrobenzoic acid

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

(B) 4π-bonds and 2σ-bonds

(A) 4π-bonds

(C) 1π-bonds and 3σ-bonds

(D) 4σ-bonds

233. \[H_2O\] is

(C) amphoric substance

(B) acid

(A) base

(D) Lewis acid

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

(A) Pentan-1-ol

(B) Pentan-2-o1

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

(A) always changes

(C) sometimes changes

(B) never changes

(D) there is no correct answer

226. Markovnikov's rule is a reaction of

(B) substitution

(C) radical polymerization

(D) oxidation

(A) addition

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

(B) always decreases

(A) always increases

(D) does not change

(C) sometimes increases

237. Atomic orbitals:

(A) are the same number in electrons

(B) some of them have not assymetric shape

(D) there is no correct answer

(C) are three different types

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

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

(A) Add 2e- to the right

(B) Add 2e- to the left

(D) Add 3H2O to the right

(C) It is balanced

141. cis-trans isomerism is

(C) is the same as E/Z isomerism

(D) possible for 1,2-dischlorethane

(A) not observed in the cyclic compounds

(B) is a form of stereoisomerism

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

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

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

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

(D) F

120. Amines are

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

(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.

227. How many isomers are possible for dibromobenzene:

(B) 2

(A) 4

(C) 3

(D) 1

119. Which of these statements describes a condensation reaction?

(A) addition of H2O to a double bond

(D) hydrolysis of an ester

(C) oxidation of ethanol to acetaldehyde

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

188. What are the possible oxidation states of sulphur:

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

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

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

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

131. Which compound can form hydrogen chemical bonds:

(C) carbon monoxide

(B) nitrogen

(A) methane

(D) dihydrogen monoxide

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

R-OH + RCOOH ->

(C) aldehyde

(B) ether

(A) ketone

(D) ester

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

(A) methanone

(C) methanal

(B) phenol

(D) glycerine

147. The rate of a chemical reaction decreases if:

(B) the atmospheric pressure is kept constant

(A) the activation energy is decreased

(C) The temperature is decreased

(D) some of the reaction products are gases

125. The general formula for an ether is

(C) R-COOH

(A) R-O-R

(D) R-OH

(B) R-CO-R

189. During an endothermic reaction:

(D) there is no correct answer

(A) there is no energy exchange

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

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

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

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

(A) chemical reaction

(C) ion exchange reaction

(B) molecular reaction

(D) there is not correct answer

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

(C) always decreases

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

(A) does not change

(B) always increases

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

(C) 3 and 5

(D) 4 and 6

181. Which of the following is alkane:

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

(B) \[C_6H_{12}\]

(D) \[C_5H_{10}\]

(A) \[C_6H_{14}\]

246. __________________is a monosaccharide

(C) glucose

(B) maltose

(A) sucrose

(D) lactose

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

(C) acid-base reaction

(D) precipitation and rebox reaction

(A) prticipation reaction

(B) redox reaction

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

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

(D) there re not correct answer

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

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

(A) C5H5N

(D) NH4OH

(B) Ca(OH)2

(C) Al(OH)3

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

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

\[CH_3CH_2CH_2CH_2OH\]

(B)

(D)

(A)

(C)

228. The IUPAC name of para-dibromobenzene is:

(C) 1,3-dibromobenzene

(B) 1,4-dibromobenzene

(A) 1, 2-dibromobenzene

(D) 4-dibromobenzene

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

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

(C) is always positive

(D) is always zero

(A) depends on the allotropic form

(B) is always negative

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

(D) CH3CO2CH2CH3

(A) (CH3)2CCl

(C) (CH3CO)2O

(B) CH3COCl

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

(A) One

(C) Four

(B) Two

(D) There is no correct answer

229. What is the IUPAC name of

\[CH_3CH_2CH_2CH(CH_3)CH_3\]?

(A) 2-methylhexane

(C) 2-methylpentane

(D) 2-methylpentene

(B) 4-methylhpentane

146. At equilibrium, concentration is of reactants:

(C) are constant

(A) are highest

(B) are lowest

(D) are variable

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) \[sp\]

(B) \[sp_3\]

(C) \[sp_2\]

213. Peptide bonds can be classified as:

(B) Carboxylic acids

(D) Esters

(C) Amides

(A) Amines

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

(D) aldehydes

(C) ketones

(A) alcohol

(B) asters

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

(A) amine

(C) ketone

(D) aldehyde

(B) amide

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

(B) does not changes

(C) always decreases

(A) always increases

(D) slightly decreases only between gases

175. The oxidation of ethanol produces _______.

(D) lactic acid

(B) formic acid

(A) acetic acid

(C) citric acid

163. C3H8O has

(D) only one isomer

(A) three isomers

(B) four isomers

(C) two isomers

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

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

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

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

(B) They contain benzene ring

(D) They are not cyclic compounds

162. The compounds CH3COCH2CH2CH3 and CH3CH2CH2CH2CH2OH are:

(D) are homologues

(A) positional isomers

(C) are not isomers

(B) chain isomers

170. Equilibrium can be established during:

(B) interaction between HCl and NaOH

(C) interaction between CH3COOH and NaOH

(A) hydrolysis of saccharose

(D) hydrolysis of proteins

200. Select the formula of potassium dichromate:

(C) \[KCr_2O_5\]

(D) \[K2Cr_2O_4\]

(B) \[KCr_2O_7\]

(A) \[K_2Cr_2O_7\]

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

(A) 2-Chloro-4-butanal

(C) 3-Chloro-4-butanal

(B) 2-Chlorobutan-4-al

(D) 3-Chlorobutanal

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

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

(C) ionic

(D) hydrogen

(A) covalent

(B) peptide

140. _________________ is a disaccharide

(A) glucose

(D) ribose

(B) galactose

(C) sucrose

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

Litmus Colour Reaction with Zn

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

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

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

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

136. I, 2-dichlorethene has

(D) positional isomers

(C) chain isomers

(A) no isomers

(B) cis-trans isomers

209. Which compound undergoes the substitution reaction with NaCN?

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

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

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

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

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

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

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

(D) There is no correct answer

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

(C) The atomic mass of the element

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

(A) Carboxylic acid

(D) Ester

(B) Ketone

(C) Aldehyde

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

(A) quaternary alcohol

(B) tertiary alcohol

(D) secondary alcohol

(C) primary alcohol

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

(B) KClO4

(D) KCl

(A) KNO3

(C) CH3COOK

123. Select the monosaccharide (s).

(C) glucose

(A) sucrose

(B) fructose

(D) fructose and glucose

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

214. Which one correctly depicts a quaternary ammonium ion?

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

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

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

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

221. Sugars are examples of what type of molecule?

(C) salts

(A) proteins

(D) acids

(B) carbohydrates

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

(B) reactionproducts

(C) reactants, if they are in gas state

(D) there is not correct answer

(A) reactants

225. The name for the compound with the formula

\[CH_3CH_2CH_2CH_2OH\] is

(A) propanol

(B) propane

(C) butanol

(D) pentanol

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

(B) \[sp^3\]

(C) \[sp^2\]

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

(A) \[sp\]

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

(B) 2 and 3

(D) 3

(A) 1 and 3

(C) 2

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

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

(B) 2

(C) 3

(A) 1

(D) 4

144. The name of the compound

\[CH_3CH_2C(CH)_2CH_2CH_3\] is:

(C) 2-methyl-2-ethylburane

(A) 3,3-dimethylpentane

(D) 2-ethyl-2-methylburane

(B) 3,3-methylpentane

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?

(D) quaternary

(C) tertiary

(B) secondary

(A) primary

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

(C) 12

(D) 4

(B) 6

(A) 8

202. In a redox reaction, there must be:

(C) A reducing agent and an oxidizing agent

(D) No reducing or oxidizing agent

(A) An oxidizing agent and no reducing agent

(B) A reducing agent and no oxidizing agent

132. Noble metals

(D) do not react with air and water

(B) do not react with air

(A) react with air

(C) react with air but not react with water

118. The two molecules represented below are:

(D) carboxylic acids

(B) isotopes

(A) isomers

(C) alcohols

164. In which compound there is ionic chemical bond:

(A) NO2

(C) KS

(D) H2S

(B) HNO3

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

(A) methanone

(D) glycerine

(B) phenol

(C) methanal

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

\[Na_2S\] is

(A) \[Na_2 ⇄ 2 Na^++S^{2-}\]

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

(C) \[Na_2S+2H_2O⇄2NaOH+H_2S\]

(B) \[S^{2-}+H_2O⇄OH^-+ HS^+\]

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

(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

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

239. Electron configuration of phosphorus is:

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

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

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

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

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

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

(A) solids

(D) gas and liquid

(B) liquids

(C) gases

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

133. Aqua regia is:

(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

(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

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

(D) I, III and IV

(C) I, II and III

(B) II and IV

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

180. Which one of the following is alkyne?

(C) \[C_4H_{10}\]

(A) \[C_4H_6\]

(D) \[C_5H_{12}\]

(B) \[C_4H_8 \]

148. When temperature is increased the rate increases:

(A) only for chemical reactions between solids

(D) there is not correct answer

(B) only for chemical reactions between gases

(C) for all chemical reactions

212. Which reactionis NOT possible with acetic acid?

(A) \[CH_3COOH + NaOH→\]

\[CH_3COOH + NH_3→\]

(B) \[CH_3COOH + NaCl→\]

(C) \[CH_3COOH + Na_2CO_3→\]

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

(C) an ether

(A) a hydrocarbon

(D) an aldehyde

(B) an ester

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

\[Br_2\]

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

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

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

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

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

(C) B1, B2

(A) A1, B2

(D) B1, A2

(B) A1, A2

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

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

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

(D) There is not correct answer

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

151. Which one correctly depicts a primary amine?

(A)

(C)

(B)

(D)

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)

(D)

(A)

179. Which structure below represents a ketone?

(D)

(B)

(C)

(A)

115. d-elements in the periodic table are:

(B) Located between 3th and 6th group

(C) Randomly spread

(A) Located between 3th and 12th group

(D) There is no current answer

223. Aniline is a(n)

(A) aliphatic amine.

(D) primary aromatic amine

(C) heterocyclic amine

(B) secondary aromatic amine

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

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

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

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

(C) fructose is a monoshaccaride and glucose is polysaccharide

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

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

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

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

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

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

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

(A) depends on the allotropic form

(B) is always negative

(C) is always positive

(D) is always zero