Random chemistry FINAL

Welcome to your Random chemistry FINAL

141. cis-trans isomerism is

(B) is a form of stereoisomerism

(A) not observed in the cyclic compounds

(D) possible for 1,2-dischlorethane

(C) is the same as E/Z isomerism

125. The general formula for an ether is

(A) R-O-R

(D) R-OH

(B) R-CO-R

(C) R-COOH

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

(D) there is no correct answer

(B) reactants, if they are in gas state

(C) reaction products

(A) reactants

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

(C) ion exchange reaction

(B) molecular reaction

(A) chemical reaction

(D) there is not correct answer

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

(D) B1, A2

(B) A1, A2

(A) A1, B2

(C) B1, B2

171. the equilibrium constant of endothermic reaction depends on:

(C) changes in product concentrations

(D) there is no correct answer

(A) changes in temperature

(B) changes in reactant concentrations

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

(C) is always positive

(A) depends on the allotropic form

(D) is always zero

(B) is always negative

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

(C) \[sp_2\]

(B) \[sp_3\]

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

(A) \[sp\]

147. The rate of a chemical reaction decreases if:

(C) The temperature is decreased

(D) some of the reaction products are gases

(B) the atmospheric pressure is kept constant

(A) the activation energy is decreased

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

(D) aldehydes

(C) ketones

(B) asters

(A) alcohol

139. The general formula fo an ether is

(B) R-CO-R

(A) R-O-R

(C) R-COOH

(D) R-OH

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

Litmus Colour Reaction with Zn

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

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

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

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

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

(D) aldehydes

(B) asters

(A) alcohol

(C) ketones

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

(B) Butan-1-ol

(D) Butan-2-ol

(A) Butanoic acid

(C) Butan-2-one

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

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

(A) C5H5N

(D) NH4OH

(C) Al(OH)3

(B) Ca(OH)2

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

(B) 2

(A) 1

(C) 3

(D) 4

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

\[Cr_2O_7{^{2-}} → 2Cr^{3+}\] ?

(C) Multiply through by 2

(D) Add 8 e to the left

(B) add 7 H2O to the right

(A) add 7 H2O to the left

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

(B) III and IV

(A) I and III

154. Select the monosaccharide (s).

(B) fructose

(D) fructose and glucose

(C) glucose

(A) sucrose

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

(B) reactionproducts

(D) there is not correct answer

(A) reactants

(C) reactants, if they are in gas state

115. d-elements in the periodic table are:

(B) Located between 3th and 6th group

(D) There is no current answer

(C) Randomly spread

(A) Located between 3th and 12th group

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

(C) ionic

(D) hydrogen

(B) peptide

(A) covalent

146. At equilibrium, concentration is of reactants:

(C) are constant

(B) are lowest

(A) are highest

(D) are variable

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

(D) aldehyde

(B) amide

(A) amine

(C) ketone

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

(A) solids

(C) gases

(D) gas and liquid

(B) liquids

164. In which compound there is ionic chemical bond:

(A) NO2

(D) H2S

(B) HNO3

(C) KS

246. __________________is a monosaccharide

(B) maltose

(D) lactose

(C) glucose

(A) sucrose

179. Which structure below represents a ketone?

(A)

(D)

(C)

(B)

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

(D) They are not cyclic compounds

(B) They contain benzene ring

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

(C) 2

(A) 1 and 3

(D) 3

(B) 2 and 3

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

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

(D) 2-isohexanol

(B) 4-methyl-2-pentanol

(C) 2-methyl-4-pentanol

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

(A) reactants

(D) there is not correct answer

(B) reaction products

(C) reactant, if they are in gas state

203. What is the name of the compound below:

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

(A) 2,4-methylbutene

(B) 2,5-dimethylpentane

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

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

(B) D-Glucose

(A) D-Sucrose

(C) D-Mannose

(D) D-Ribose

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

(B) I and III

(A) II and IV

(C) I and IV

132. Noble metals

(A) react with air

(D) do not react with air and water

(B) do not react with air

(C) react with air but not react with water

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

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

(D) There is no correct answer

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

(D) gas and liquid

(A) Solids

(C) gases

(B) Liquids

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

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

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

(D) F

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

239. Electron configuration of phosphorus is:

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

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

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

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

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

(B) highest in the final stages of the reaction

(D) slowest in the initial stages of the reaction

118. The two molecules represented below are:

(D) carboxylic acids

(C) alcohols

(A) isomers

(B) isotopes

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

(C) ethers

(B) maltose

(D) amides

(A) ketones

194. The equilibrium constant:

(D) there is no correct answer

(A) can be changed at constant temperature

(B) depend on changes in reactant concentrations

(C) depend on changes in product concentrations

166. The thermal effect of chemical reaction represents:

(D) heat

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

(C) chemical nature of reaction products

(A) chemical nature of reactants

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

(A) Add 2e- to the right

(D) Add 3H2O to the right

(C) It is balanced

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

(C) I, II and III

(D) III and IV

(B) II and IV

120. Amines are

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

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

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

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

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

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.

(D) II and IV

(A) I and III;

(B) I and IV;

(C) II and III;

209. Which compound undergoes the substitution reaction with NaCN?

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

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

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

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

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

\[HNO_2 +\,→\,NO + I3 -\]

(D) N, O

(C) N, I-

(B) I-, N

(A) O, I

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

(B) redox reaction

(A) prticipation reaction

(D) precipitation and rebox reaction

(C) acid-base reaction

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

(D) 4

(C) 3

(B) 2

(A) 1

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

(D) slightly decreases only between gases

(B) does not changes

(C) always decreases

(A) always increases

225. The name for the compound with the formula

\[CH_3CH_2CH_2CH_2OH\] is

(A) propanol

(B) propane

(C) butanol

(D) pentanol

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

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

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

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

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

(D) amide

(A) ketone

(C) amine

(B) ester

229. What is the IUPAC name of

\[CH_3CH_2CH_2CH(CH_3)CH_3\]?

(A) 2-methylhexane

(D) 2-methylpentene

(B) 4-methylhpentane

(C) 2-methylpentane

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

\[Br_2\]

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

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

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

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

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

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

(C) always decreases

(A) does not change

(B) always increases

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

175. The oxidation of ethanol produces _______.

(B) formic acid

(C) citric acid

(D) lactic acid

(A) acetic acid

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

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

(B) \[sp^3\]

(A) \[sp\]

(C) \[sp^2\]

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

163. C3H8O has

(D) only one isomer

(A) three isomers

(B) four isomers

(C) two isomers

140. _________________ is a disaccharide

(B) galactose

(D) ribose

(A) glucose

(C) sucrose

232. The oxidation number of C in

\[H_2C_2O_4\] is?

(A) +3

(D) -2

(C) +4

(B) +2

170. Equilibrium can be established during:

(C) interaction between CH3COOH and NaOH

(B) interaction between HCl and NaOH

(A) hydrolysis of saccharose

(D) hydrolysis of proteins

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

(A) One

(C) Four

(D) There is no correct answer

(B) Two

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

144. The name of the compound

\[CH_3CH_2C(CH)_2CH_2CH_3\] is:

(A) 3,3-dimethylpentane

(D) 2-ethyl-2-methylburane

(C) 2-methyl-2-ethylburane

(B) 3,3-methylpentane

137. Pentane has

(C) two chain isomers

(D) one chain isomers

(A) three chain isomers

(B) four chain isomers

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

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

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

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

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

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

214. Which one correctly depicts a quaternary ammonium ion?

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

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

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

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

227. How many isomers are possible for dibromobenzene:

(D) 1

(B) 2

(A) 4

(C) 3

213. Peptide bonds can be classified as:

(D) Esters

(A) Amines

(B) Carboxylic acids

(C) Amides

221. Sugars are examples of what type of molecule?

(A) proteins

(C) salts

(D) acids

(B) carbohydrates

195. The electrons in the first electron shell have:

(B) have no energy

(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

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

(A) 2,4 and 5

(B) 1, 2 and 4

(C) 3 and 5

134. The principal difference between fructose ans glucose is that__________

(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

(C) fructose is a monosaccharide and glucose is polysaccharide

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

(D) Sulphur

(C) Nitrogen

(A) Iodine

(B) Chlorine

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

R-OH + RCOOH ->

(A) ketone

(C) aldehyde

(B) ether

(D) ester

202. In a redox reaction, there must be:

(D) No reducing or oxidizing agent

(A) An oxidizing agent and no reducing agent

(C) A reducing agent and an oxidizing agent

(B) A reducing agent and no oxidizing agent

212. Which reactionis NOT possible with acetic acid?

(C) \[CH_3COOH + Na_2CO_3→\]

(B) \[CH_3COOH + NaCl→\]

\[CH_3COOH + NH_3→\]

(A) \[CH_3COOH + NaOH→\]

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

(B) I and III

(A) II and IV

(D) II and IV

(C) I and IV

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

(D) aldehyde

(C) ketone

(A) amine

(B) amide

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

(D) II and III

(C) I and II

136. I, 2-dichlorethene has

(B) cis-trans isomers

(C) chain isomers

(A) no isomers

(D) positional isomers

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

(A) (CH3)2CCl

(C) (CH3CO)2O

(B) CH3COCl

(D) CH3CO2CH2CH3

244. 1, 2-dichlorethene has

(D) positional isomers

(A) no isomers

(C) chain isomers

(B) cis-trans isomers

237. Atomic orbitals:

(D) there is no correct answer

(A) are the same number in electrons

(C) are three different types

(B) some of them have not assymetric shape

135. Which one of the following statement is true?

(A) Metals tend to oxidize nonmetals

(B) Metals do not react with nonmetals

(C) Nonmetals tend to oxidize metals

(D) Nonmetals tend to reduce metals

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

A.
B.
C.

D.

(D)

(A)

(B)

(C)

119. Which of these statements describes a condensation reaction?

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

(A) addition of H2O to a double bond

(D) hydrolysis of an ester

(C) oxidation of ethanol to acetaldehyde

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

(B) closer to more electropositive atom

(C) at same distance between the two atoms

(A) closer to more electronegative atom

(D) there is no correct answer

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

180. Which one of the following is alkyne?

(D) \[C_5H_{12}\]

(A) \[C_4H_6\]

(C) \[C_4H_{10}\]

(B) \[C_4H_8 \]

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

(B) 6

(D) 4

(A) 8

(C) 12

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

(B) is always negative

(C) is always positive

(D) is always zero

(A) depends on the allotropic form

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

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

(B) 3-nitro-6-chlorobenzoic acid

(A) 5-chloro-2-nitrobenzoic acid

(C) 2-chloro-5-nitrobenzoic acid

(D) 4-nitro-1.chlorobenzoic acid

127. What is the correct classification for this alcohol?

(D) quaternary

(B) secondary

(C) tertiary

(A) primary

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

(A) methanone

(B) phenol

(D) glycerine

(C) methanal

162. The compounds CH3COCH2CH2CH3 and CH3CH2CH2CH2CH2OH are:

(D) are homologues

(C) are not isomers

(B) chain isomers

(A) positional isomers

233. \[H_2O\] is

(C) amphoric substance

(B) acid

(D) Lewis acid

(A) base

223. Aniline is a(n)

(C) heterocyclic amine

(A) aliphatic amine.

(B) secondary aromatic amine

(D) primary aromatic amine

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

\[Na_2S\] is

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

(A) \[Na_2 ⇄ 2 Na^++S^{2-}\]

(B) \[S^{2-}+H_2O⇄OH^-+ HS^+\]

(C) \[Na_2S+2H_2O⇄2NaOH+H_2S\]

181. Which of the following is alkane:

(D) \[C_5H_{10}\]

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

(A) \[C_6H_{14}\]

(B) \[C_6H_{12}\]

148. When temperature is increased the rate increases:

(B) only for chemical reactions between gases

(D) there is not correct answer

(C) for all chemical reactions

(A) only for chemical reactions between solids

131. Which compound can form hydrogen chemical bonds:

(B) nitrogen

(C) carbon monoxide

(D) dihydrogen monoxide

(A) methane

193. 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

123. Select the monosaccharide (s).

(D) fructose and glucose

(B) fructose

(A) sucrose

(C) glucose

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

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

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

(D) There is not correct answer

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

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

228. The IUPAC name of para-dibromobenzene is:

(C) 1,3-dibromobenzene

(D) 4-dibromobenzene

(B) 1,4-dibromobenzene

(A) 1, 2-dibromobenzene

226. Markovnikov's rule is a reaction of

(A) addition

(C) radical polymerization

(D) oxidation

(B) substitution

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

(A) methanone

(C) methanal

(D) glycerine

(B) phenol

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

(B) tertiary alcohol

(D) secondary alcohol

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

\[CH_3CH_2CH_2CH_2OH\]

(B)

(A)

(C)

(D)

235. The isotopes of a chemical element have:

(C) different number of electrons in the electron shell

(D) there is not correct answer

(A) the same number in periodic table

(B) the same mass number

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

(D) Ester

(C) Aldehyde

(B) Ketone

(A) Carboxylic acid

200. Select the formula of potassium dichromate:

(A) \[K_2Cr_2O_7\]

(C) \[KCr_2O_5\]

(D) \[K2Cr_2O_4\]

(B) \[KCr_2O_7\]

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

(C) Zinc oxide, copper oxide and sulfur dioxide

(A) Zinc sulfate and copper

(D) Zinc oxide, copper oxide and oxygen

(B) Zinc oxide and copper oxide

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

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

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

(D) KCl

(A) KNO3

(C) CH3COOK

(B) KClO4

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

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

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

(D) There is no correct answer

(C) The atomic mass of the element

151. Which one correctly depicts a primary amine?

(A)

(D)

(C)

(B)

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

(B) an ester

(A) a hydrocarbon

(D) an aldehyde

(C) an ether

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

(B) an aldehyde

(D) a ketone

(C) an alkane

(A) an alcohol

197. The nucleus of an atom:

(B) contains electrons

(C) has positive electric charge

(D) does not contain neutrons

(A) is neutral