Random chemistry FINAL

Welcome to your Random chemistry FINAL

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

179. Which structure below represents a ketone?

(D)

(C)

(B)

(A)

221. Sugars are examples of what type of molecule?

(A) proteins

(C) salts

(D) acids

(B) carbohydrates

175. The oxidation of ethanol produces _______.

(D) lactic acid

(A) acetic acid

(C) citric acid

(B) formic acid

189. During an endothermic reaction:

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

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

(A) there is no energy exchange

(D) there is no correct answer

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

(D) there is not correct answer

(C) reactants, if they are in gas state

(B) reactionproducts

(A) reactants

202. In a redox reaction, there must be:

(B) A reducing agent and no oxidizing agent

(C) A reducing agent and an oxidizing agent

(A) An oxidizing agent and no reducing agent

(D) No reducing or oxidizing agent

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

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

(D) B1, A2

(A) A1, B2

(C) B1, B2

(B) A1, A2

139. The general formula fo an ether is

(B) R-CO-R

(D) R-OH

(C) R-COOH

(A) R-O-R

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

(D) alcohol and amine

(C) alcohol and carboxylic acid

(B) amine and carboxylic acid

(A) ester and amine

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

(C) \[sp_2\]

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

(A) \[sp\]

(B) \[sp_3\]

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

120. Amines are

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

(B) organic acids that reacts 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.

181. Which of the following is alkane:

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

(B) \[C_6H_{12}\]

(A) \[C_6H_{14}\]

(D) \[C_5H_{10}\]

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

141. cis-trans isomerism is

(A) not observed in the cyclic compounds

(D) possible for 1,2-dischlorethane

(C) is the same as E/Z isomerism

(B) is a form of stereoisomerism

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

(A) an alcohol

(D) a ketone

(C) an alkane

(B) an aldehyde

163. C3H8O has

(B) four isomers

(D) only one isomer

(A) three isomers

(C) two isomers

239. Electron configuration of phosphorus is:

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

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

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

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

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

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

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

(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

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

(C) 3

(A) 1

(D) 4

(B) 2

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

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

(A) reactants

(B) reaction products

227. How many isomers are possible for dibromobenzene:

(C) 3

(D) 1

(A) 4

(B) 2

223. Aniline is a(n)

(B) secondary aromatic amine

(A) aliphatic amine.

(D) primary aromatic amine

(C) heterocyclic amine

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

(D) CH3CO2CH2CH3

(B) CH3COCl

(A) (CH3)2CCl

(C) (CH3CO)2O

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

(D) aldehydes

(A) alcohol

(B) asters

(C) ketones

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

(B) III and IV

(D) II and III

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

(D) NH4OH

(B) Ca(OH)2

(A) C5H5N

(C) Al(OH)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;

(D) 4 and 6

(B) 1, 2 and 4

(C) 3 and 5

(A) 2,4 and 5

244. 1, 2-dichlorethene has

(B) cis-trans isomers

(D) positional isomers

(C) chain isomers

(A) no isomers

195. The electrons in the first electron shell have:

(B) have no energy

(A) the lowest energy in the atom

(D) the same amount of energy as the protons

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

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

\[Na_2S\] is

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

(C) \[Na_2S+2H_2O⇄2NaOH+H_2S\]

(A) \[Na_2 ⇄ 2 Na^++S^{2-}\]

(B) \[S^{2-}+H_2O⇄OH^-+ HS^+\]

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

(B) liquids

(A) solids

(D) gas and liquid

(C) gases

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

R-OH + RCOOH ->

(B) ether

(C) aldehyde

(D) ester

(A) ketone

212. Which reactionis NOT possible with acetic acid?

\[CH_3COOH + NH_3→\]

(C) \[CH_3COOH + Na_2CO_3→\]

(A) \[CH_3COOH + NaOH→\]

(B) \[CH_3COOH + NaCl→\]

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

\[Cr_2O_7{^{2-}} → 2Cr^{3+}\] ?

(B) add 7 H2O to the right

(D) Add 8 e to the left

(C) Multiply through by 2

(A) add 7 H2O to the left

188. What are the possible oxidation states of sulphur:

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

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

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

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

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

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

(B) is always negative

(A) depends on the allotropic form

(D) is always zero

(C) is always positive

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

(A) always changes

(B) never changes

(C) sometimes changes

(D) there is no correct answer

162. The compounds CH3COCH2CH2CH3 and CH3CH2CH2CH2CH2OH are:

(D) are homologues

(C) are not isomers

(A) positional isomers

(B) chain isomers

131. Which compound can form hydrogen chemical bonds:

(B) nitrogen

(D) dihydrogen monoxide

(C) carbon monoxide

(A) methane

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

(A) alcohol

(B) asters

(C) ketones

(D) aldehydes

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

(A) Add 2e- to the right

(B) Add 2e- to the left

(C) It is balanced

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

(B) 2

(C) 3

(D) 4

(A) 1

213. Peptide bonds can be classified as:

(D) Esters

(A) Amines

(B) Carboxylic acids

(C) Amides

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

(A) I and II

(D) II and III

(B) III and IV

169. The rate of a first order reaction is:

(D) slowest 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

(A) highest in the initial stages of the reaction

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

(C) is always positive

(B) is always negative

(A) depends on the allotropic form

(D) is always zero

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

(B) Liquids

(A) Solids

(C) gases

(D) gas and liquid

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

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

(A) always increases

(D) slightly decreases only between gases

(C) always decreases

(B) does not changes

146. At equilibrium, concentration is of reactants:

(A) are highest

(C) are constant

(D) are variable

(B) are lowest

226. Markovnikov's rule is a reaction of

(C) radical polymerization

(A) addition

(D) oxidation

(B) substitution

170. Equilibrium can be established during:

(D) hydrolysis of proteins

(C) interaction between CH3COOH and NaOH

(A) hydrolysis of saccharose

(B) interaction between HCl and NaOH

232. The oxidation number of C in

\[H_2C_2O_4\] is?

(A) +3

(B) +2

(D) -2

(C) +4

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

(C) ion exchange reaction

(B) molecular reaction

(D) there is not correct answer

(A) chemical reaction

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

(D) KCl

(A) KNO3

(B) KClO4

(C) CH3COOK

154. Select the monosaccharide (s).

(C) glucose

(D) fructose and glucose

(A) sucrose

(B) fructose

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

(D) amides

(A) ketones

(C) ethers

(B) maltose

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

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

(B) I and III

(C) I and IV

(A) II and IV

(D) II and IV

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

\[Br_2\]

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

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

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

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

164. In which compound there is ionic chemical bond:

(A) NO2

(B) HNO3

(D) H2S

(C) KS

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

(C) at same distance between the two atoms

(D) there is no correct answer

(A) closer to more electronegative atom

(B) closer to more electropositive atom

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

A.
B.
C.

D.

(B)

(C)

(D)

(A)

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

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

(C) methanal

(A) methanone

(B) phenol

(D) glycerine

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

(C) I, II and III

(B) II and IV

(A) I and III

(D) I, III and IV

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

Litmus Colour Reaction with Zn

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

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

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

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

180. Which one of the following is alkyne?

(A) \[C_4H_6\]

(D) \[C_5H_{12}\]

(B) \[C_4H_8 \]

(C) \[C_4H_{10}\]

228. The IUPAC name of para-dibromobenzene is:

(A) 1, 2-dibromobenzene

(D) 4-dibromobenzene

(C) 1,3-dibromobenzene

(B) 1,4-dibromobenzene

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

(B) phenol

(C) methanal

(D) glycerine

(A) methanone

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

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

(D) F

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

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

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

(A) amine

(C) ketone

(B) amide

(D) aldehyde

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

(A) 8

(C) 12

(B) 6

(D) 4

136. I, 2-dichlorethene has

(C) chain isomers

(A) no isomers

(B) cis-trans isomers

(D) positional isomers

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

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

(A) Zinc sulfate and copper

(B) Zinc oxide and copper oxide

(C) Zinc oxide, copper oxide and sulfur dioxide

(D) Zinc oxide, copper oxide and oxygen

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

(C) always decreases

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

(B) always increases

(A) does not change

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

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

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

(D) There is not correct answer

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

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

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

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

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

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

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

214. Which one correctly depicts a quaternary ammonium ion?

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

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

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

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

132. Noble metals

(A) react with air

(B) do not react with air

(D) do not react with air and water

(C) react with air but not react with water

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

(A) Butanoic acid

(B) Butan-1-ol

(C) Butan-2-one

(D) Butan-2-ol

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

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

(C) D-Mannose

(A) D-Sucrose

(B) D-Glucose

(D) D-Ribose

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

(A) covalent

(B) peptide

(D) hydrogen

(C) ionic

123. Select the monosaccharide (s).

(D) fructose and glucose

(A) sucrose

(B) fructose

(C) glucose

140. _________________ is a disaccharide

(D) ribose

(B) galactose

(A) glucose

(C) sucrose

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

148. When temperature is increased the rate increases:

(B) only for chemical reactions between gases

(D) there is not correct answer

(A) only for chemical reactions between solids

(C) for all chemical reactions

246. __________________is a monosaccharide

(B) maltose

(D) lactose

(C) glucose

(A) sucrose

118. The two molecules represented below are:

(B) isotopes

(D) carboxylic acids

(A) isomers

(C) alcohols

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

(B) Ketone

(D) Ester

(C) Aldehyde

(A) Carboxylic acid

151. Which one correctly depicts a primary amine?

(C)

(D)

(B)

(A)

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

(C) \[sp^2\]

(A) \[sp\]

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

(B) \[sp^3\]

197. The nucleus of an atom:

(D) does not contain neutrons

(A) is neutral

(B) contains electrons

(C) has positive electric charge

200. Select the formula of potassium dichromate:

(C) \[KCr_2O_5\]

(A) \[K_2Cr_2O_7\]

(B) \[KCr_2O_7\]

(D) \[K2Cr_2O_4\]

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

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

(D) 3

(A) 1 and 3

(B) 2 and 3

(C) 2

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

(B) I and III

(C) I and IV

(D) II and IV

135. Which one of the following statement is true?

(B) Metals do not react with nonmetals

(A) Metals tend to oxidize nonmetals

(C) Nonmetals tend to oxidize metals

(D) Nonmetals tend to reduce metals

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

(D) There is no correct answer

(C) Four

(B) Two

(A) One

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

(B) Pentan-2-o1

(D) 1-methylcyclohexam-1-ol

(C) 2-Methybutan-2-ol

(A) Pentan-1-ol

147. The rate of a chemical reaction decreases if:

(C) The temperature is decreased

(B) the atmospheric pressure is kept constant

(A) the activation energy is decreased

(D) some of the reaction products are gases

125. The general formula for an ether is

(A) R-O-R

(D) R-OH

(B) R-CO-R

(C) R-COOH

137. Pentane has

(D) one chain isomers

(B) four chain isomers

(A) three chain isomers

(C) two chain isomers

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

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

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

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

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

(A) reactants

(C) reaction products

229. What is the IUPAC name of

\[CH_3CH_2CH_2CH(CH_3)CH_3\]?

(C) 2-methylpentane

(B) 4-methylhpentane

(D) 2-methylpentene

(A) 2-methylhexane

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

(B) II and IV

(C) I, II and III

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

(B) I and IV;

(C) II and III;

(A) I and III;

233. \[H_2O\] is

(C) amphoric substance

(A) base

(B) acid

(D) Lewis acid

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

(B) amide

(C) ketone

(D) aldehyde

(A) amine

144. The name of the compound

\[CH_3CH_2C(CH)_2CH_2CH_3\] is:

(D) 2-ethyl-2-methylburane

(A) 3,3-dimethylpentane

(B) 3,3-methylpentane

(C) 2-methyl-2-ethylburane

225. The name for the compound with the formula

\[CH_3CH_2CH_2CH_2OH\] is

(C) butanol

(A) propanol

(B) propane

(D) pentanol

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

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

(B) 4-methyl-2-pentanol

(D) 2-isohexanol

(C) 2-methyl-4-pentanol

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

\[HNO_2 +\,→\,NO + I3 -\]

(B) I-, N

(D) N, O

(C) N, I-

(A) O, I

237. Atomic orbitals:

(A) are the same number in electrons

(D) there is no correct answer

(B) some of them have not assymetric shape

(C) are three different types

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

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

(D) There is no correct answer

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

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

127. What is the correct classification for this alcohol?

(D) quaternary

(C) tertiary

(A) primary

(B) secondary

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

(B) Chlorine

(A) Iodine

(D) Sulphur

(C) Nitrogen

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

\[CH_3CH_2CH_2CH_2OH\]

(B)

(C)

(A)

(D)

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

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

(B) They contain benzene ring

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

(D) They are not cyclic compounds

166. The thermal effect of chemical reaction represents:

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

(C) chemical nature of reaction products

(A) chemical nature of reactants

(D) heat

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

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

(B) ester

(C) amine

(D) amide

(A) ketone

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

(A) a hydrocarbon

(C) an ether

(B) an ester

(D) an aldehyde

134. The principal difference between fructose ans glucose is that__________

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

(C) fructose is a monosaccharide and glucose is polysaccharide

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

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