Chemistry final – St Kliment

Welcome to your Chemistry final

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

(A) 1

(B) 2

(C) 3

(D) 4

115. d-elements in the periodic table are:

(A) Located between 3th and 12th group

(B) Located between 3th and 6th group

(C) Randomly spread

(D) There is no current answer

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

(A) One

(B) Two

(C) Four

(D) There is no correct answer

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

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

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

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

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

(D) there re not correct answer

118. The two molecules represented below are:

(A) isomers

(B) isotopes

(C) alcohols

(D) carboxylic acids

119. Which of these statements describes a condensation reaction?

(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

(D) hydrolysis of an ester

120. Amines are

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

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

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

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

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

(C) primary alcohol

(D) secondary alcohol

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

(A) alcohol

(B) asters

(C) ketones

(D) aldehydes

123. Select the monosaccharide (s).

(A) sucrose

(B) fructose

(C) glucose

(D) fructose and glucose

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

(A) an alcohol

(B) an aldehyde

(C) an alkane

(D) a ketone

125. The general formula for an ether is

(A) R-O-R

(B) R-CO-R

(C) R-COOH

(D) R-OH

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

(A) methanone

(B) phenol

(C) methanal

(D) glycerine

127. What is the correct classification for this alcohol?

(A) primary

(B) secondary

(C) tertiary

(D) quaternary

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

(A) amine

(B) amide

(C) ketone

(D) aldehyde

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

(A) reactants

(B) reactionproducts

(C) reactants, if they are in gas state

(D) there is not correct answer

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

131. Which compound can form hydrogen chemical bonds:

(A) methane

(B) nitrogen

(C) carbon monoxide

(D) dihydrogen monoxide

132. Noble metals

(A) react with air

(B) do not react with air

(C) react with air but not react with water

(D) do not react with air and water

133. Aqua regia is:

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

(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

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

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

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

136. I, 2-dichlorethene has

(A) no isomers

(B) cis-trans isomers

(C) chain isomers

(D) positional isomers

137. Pentane has

(A) three chain isomers

(B) four chain isomers

(C) two chain isomers

(D) one chain isomers

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

(A) methanone

(B) phenol

(C) methanal

(D) glycerine

139. The general formula fo an ether is

(A) R-O-R

(B) R-CO-R

(C) R-COOH

(D) R-OH

140. _________________ is a disaccharide

(A) glucose

(B) galactose

(C) sucrose

(D) ribose

141. cis-trans isomerism is

(A) not observed in the cyclic compounds

(B) is a form of stereoisomerism

(C) is the same as E/Z isomerism

(D) possible for 1,2-dischlorethane

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

(C) I and II

(D) II and III

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

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

(B) They contain benzene ring

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

(D) They are not cyclic compounds

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

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

(A) always increases

(B) always decreases

(C) sometimes increases

(D) does not change

146. At equilibrium, concentration is of reactants:

(A) are highest

(B) are lowest

(C) are constant

(D) are variable

147. The rate of a chemical reaction decreases if:

(A) the activation energy is decreased

(B) the atmospheric pressure is kept constant

(C) The temperature is decreased

(D) some of the reaction products are gases

148. When temperature is increased the rate increases:

(A) only for chemical reactions between solids

(B) only for chemical reactions between gases

(C) for all chemical reactions

(D) there is not correct answer

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

(A) reactants

(B) reaction products

(C) reactant, if they are in gas state

(D) there is not correct answer

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

(A) depends on the allotropic form

(B) is always negative

(C) is always positive

(D) is always zero

151. Which one correctly depicts a primary amine?

(A)

(B)

(C)

(D)

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

A.
B.
C.

D.

(A)

(B)

(C)

(D)

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

(A) alcohol

(B) asters

(C) ketones

(D) aldehydes

154. Select the monosaccharide (s).

(A) sucrose

(B) fructose

(C) glucose

(D) fructose and glucose

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

(A) 5-chloro-2-nitrobenzoic acid

(B) 3-nitro-6-chlorobenzoic acid

(C) 2-chloro-5-nitrobenzoic acid

(D) 4-nitro-1.chlorobenzoic acid

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

(A) (CH3)2CCl

(B) CH3COCl

(C) (CH3CO)2O

(D) CH3CO2CH2CH3

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

(A) C5H5N

(B) Ca(OH)2

(C) Al(OH)3

(D) NH4OH

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

(A) KNO3

(B) KClO4

(C) CH3COOK

(D) KCl

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

\[HNO_2 +\,→\,NO + I3 -\]

(A) O, I

(B) I-, N

(C) N, I-

(D) N, O

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

(B) I and III

(C) I and IV

(D) II and IV

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

162. The compounds CH3COCH2CH2CH3 and CH3CH2CH2CH2CH2OH are:

(A) positional isomers

(B) chain isomers

(C) are not isomers

(D) are homologues

163. C3H8O has

(A) three isomers

(B) four isomers

(C) two isomers

(D) only one isomer

164. In which compound there is ionic chemical bond:

(A) NO2

(B) HNO3

(C) KS

(D) H2S

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

(A) closer to more electronegative atom

(B) closer to more electropositive atom

(C) at same distance between the two atoms

(D) there is no correct answer

166. The thermal effect of chemical reaction represents:

(A) chemical nature of reactants

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

(C) chemical nature of reaction products

(D) heat

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

(A) reactants

(B) reactants, if they are in gas state

(C) reaction products

(D) there is no correct answer

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

(A) does not change

(B) always increases

(C) always decreases

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

169. The rate of a first order reaction is:

(A) highest in the initial stages of the reaction

(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

170. Equilibrium can be established during:

(A) hydrolysis of saccharose

(B) interaction between HCl and NaOH

(C) interaction between CH3COOH and NaOH

(D) hydrolysis of proteins

171. the equilibrium constant of endothermic reaction depends on:

(A) changes in temperature

(B) changes in reactant concentrations

(C) changes in product concentrations

(D) there is no correct answer

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

(A) Carboxylic acid

(B) Ketone

(C) Aldehyde

(D) Ester

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

(A) \[sp\]

(B) \[sp^3\]

(C) \[sp^2\]

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

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

(A) covalent

(B) peptide

(C) ionic

(D) hydrogen

175. The oxidation of ethanol produces _______.

(A) acetic acid

(B) formic acid

(C) citric acid

(D) lactic acid

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

R-OH + RCOOH ->

(A) ketone

(B) ether

(C) aldehyde

(D) ester

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

(A) ester and amine

(B) amine and carboxylic acid

(C) alcohol and carboxylic acid

(D) alcohol and amine

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

\[CH_3CH_2CH_2CH_2OH\]

(A)

(B)

(C)

(D)

179. Which structure below represents a ketone?

(A)

(B)

(C)

(D)

180. Which one of the following is alkyne?

(A) \[C_4H_6\]

(B) \[C_4H_8 \]

(C) \[C_4H_{10}\]

(D) \[C_5H_{12}\]

181. Which of the following is alkane:

(A) \[C_6H_{14}\]

(B) \[C_6H_{12}\]

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

(D) \[C_5H_{10}\]

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

(A) \[sp\]

(B) \[sp_3\]

(C) \[sp_2\]

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

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

(A) 1 and 3

(B) 2 and 3

(C) 2

(D) 3

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

(A) Iodine

(B) Chlorine

(C) Nitrogen

(D) Sulphur

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

(C) The atomic mass of the element

(D) There is no correct answer

186. The total sum of protons and neutrons in the nucleus of a chemical element determines:

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

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

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

(D) There is no correct answer

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

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

189. During an endothermic reaction:

(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

(D) there is no correct answer

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

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

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

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

(D) There is not correct answer

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

(A) solids

(B) liquids

(C) gases

(D) gas and liquid

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

(A) always increases

(B) does not changes

(C) always decreases

(D) slightly decreases only between gases

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

194. 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

195. The electrons in the first electron shell have:

(A) the lowest energy in the atom

(B) have no energy

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

(D) the same amount of energy as the protons

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

(A) 8

(B) 6

(C) 12

(D) 4

197. The nucleus of an atom:

(A) is neutral

(B) contains electrons

(C) has positive electric charge

(D) does not contain neutrons

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

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

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

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

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

(D) F

200. Select the formula of potassium dichromate:

(A) \[K_2Cr_2O_7\]

(B) \[KCr_2O_7\]

(C) \[KCr_2O_5\]

(D) \[K2Cr_2O_4\]

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

202. In a redox reaction, there must be:

(A) An oxidizing agent and no reducing agent

(B) A reducing agent and no oxidizing agent

(C) A reducing agent and an oxidizing agent

(D) No reducing or oxidizing agent

203. What is the name of the compound below:

(A) 2,4-methylbutene

(B) 2,5-dimethylpentane

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

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

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

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

(B) 4-methyl-2-pentanol

(C) 2-methyl-4-pentanol

(D) 2-isohexanol

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

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

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

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

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

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

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

\[Na_2S\] is

(A) \[Na_2 ⇄ 2 Na^++S^{2-}\]

(B) \[S^{2-}+H_2O⇄OH^-+ HS^+\]

(C) \[Na_2S+2H_2O⇄2NaOH+H_2S\]

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

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

Litmus Colour Reaction with Zn

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

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

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

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

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

\[Br_2\]

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

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

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

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

209. Which compound undergoes the substitution reaction with NaCN?

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

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

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

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

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

(B) Pentan-2-o1

(C) 2-Methybutan-2-ol

(D) 1-methylcyclohexam-1-ol

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

(A) 2-Chloro-4-butanal

(B) 2-Chlorobutan-4-al

(C) 3-Chloro-4-butanal

(D) 3-Chlorobutanal

212. Which reactionis NOT possible with acetic acid?

(A) \[CH_3COOH + NaOH→\]

(B) \[CH_3COOH + NaCl→\]

(C) \[CH_3COOH + Na_2CO_3→\]

\[CH_3COOH + NH_3→\]

213. Peptide bonds can be classified as:

(A) Amines

(B) Carboxylic acids

(C) Amides

(D) Esters

214. Which one correctly depicts a quaternary ammonium ion?

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

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

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

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

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

(A) D-Sucrose

(B) D-Glucose

(C) D-Mannose

(D) D-Ribose

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.

(A) I and III;

(B) I and IV;

(C) II and III;

(D) II and IV

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

(B) II and IV

(C) I, II and III

(D) I, III and IV

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

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

(B) II and IV

(C) I, II and III

(D) III and IV

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

(A) A1, B2

(B) A1, A2

(C) B1, B2

(D) B1, A2

221. Sugars are examples of what type of molecule?

(A) proteins

(B) carbohydrates

(C) salts

(D) acids

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

(A) ketone

(B) ester

(C) amine

(D) amide

223. Aniline is a(n)

(A) aliphatic amine.

(B) secondary aromatic amine

(C) heterocyclic amine

(D) primary aromatic amine

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

(A) a hydrocarbon

(B) an ester

(C) an ether

(D) an aldehyde

225. The name for the compound with the formula

\[CH_3CH_2CH_2CH_2OH\] is

(A) propanol

(B) propane

(C) butanol

(D) pentanol

226. Markovnikov's rule is a reaction of

(A) addition

(B) substitution

(C) radical polymerization

(D) oxidation

227. How many isomers are possible for dibromobenzene:

(A) 4

(B) 2

(C) 3

(D) 1

228. The IUPAC name of para-dibromobenzene is:

(A) 1, 2-dibromobenzene

(B) 1,4-dibromobenzene

(C) 1,3-dibromobenzene

(D) 4-dibromobenzene

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

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

\[Cr_2O_7{^{2-}} → 2Cr^{3+}\] ?

(A) add 7 H2O to the left

(B) add 7 H2O to the right

(C) Multiply through by 2

(D) Add 8 e to the left

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

(C) It is balanced

(D) Add 3H2O to the right

232. The oxidation number of C in

\[H_2C_2O_4\] is?

(A) +3

(B) +2

(C) +4

(D) -2

233. \[H_2O\] is

(A) base

(B) acid

(C) amphoric substance

(D) Lewis acid

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

(A) prticipation reaction

(B) redox reaction

(C) acid-base reaction

(D) precipitation and rebox reaction

235. The isotopes of a chemical element have:

(A) the same number in periodic table

(B) the same mass number

(C) different number of electrons in the electron shell

(D) there is not correct answer

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

(A) chemical reaction

(B) molecular reaction

(C) ion exchange reaction

(D) there is not correct answer

237. Atomic orbitals:

(A) are the same number in electrons

(B) some of them have not assymetric shape

(C) are three different types

(D) there is no correct answer

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

(A) 1

(B) 2

(C) 3

(D) 4

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

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

(A) Solids

(B) Liquids

(C) gases

(D) gas and liquid

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

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

(A) amine

(B) amide

(C) ketone

(D) aldehyde

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

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

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

(C) fructose is a monoshaccaride and glucose is polysaccharide

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

244. 1, 2-dichlorethene has

(A) no isomers

(B) cis-trans isomers

(C) chain isomers

(D) positional isomers

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

(A) ketones

(B) maltose

(C) ethers

(D) amides

246. __________________is a monosaccharide

(A) sucrose

(B) maltose

(C) glucose

(D) lactose

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

(B) III and IV

(C) I and II

(D) II and III