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Chemistry Class 10th

201. Alkynes can be prepared using:

A) Reduction

B) Elimination

C) Addition

D) None of the above

Answer
B

202. Dihalides attached to adjacent carbon atoms are called:

A) Halide Group

B) Vicinal Dihalide

C) Prostatic Group

D) Inhibitor Group

Answer
B

203. Tetrahalides are compounds having _________ halogens

A) 2

B) 4

C) 5

D) None

Answer
B

204. The first three alkynes are ______.

A) Gases

B) Liquids

C) Solids

D) Volatile Liquid

Answer
A

205. Alkynes are non polar:

A) True

B) False

Answer
A

206. Combustion of Alkynes produce:

A) CO2

B) Water

C) Heat

D) All of the above

Answer
D

207. The Melting and Boiling points of Alkynes increases as we go up the chart.

A) True

B) False

Answer
A

208. Which of the following is a substitution reaction:

A) Halogenation of Alkynes

B Halogenation of  Alkenes

C) Halogenation of Alkanes

D) Oxidation of Alkenes

Answer
C

209. Halogenation of methane in the presence of diffused sunlight occurs:

A) Quickly, Only in one step

B) Slowing in one step

C) In series of four steps

D) Quickly in two steps

Answer
C

210. Which of the following decolourizes Br2 Water

A) Ethane

B) Ethene

C) Propane

D) Methane

Answer
B

211. Dehydration of Ethyl Alcohol with conc H2SO4 results in the formation of:

A) Ethane

B) Methane

C) Ethyne

D) Ethene

Answer
C

212. Substitution reaction is the characteristic of:

A) Alkynes

B) Alkenes

C) Alkanes

D) None of the above

Answer
C

213. Which of the following is the least reactive:

A) Ethyne

B) Propene

C) Ethene

D)Ethane

Answer
D

214. The chemical analysis of Protoplasm shows that there are _______ types of compounds:

A) 2

B) 3

C) 5

D) None

Answer
A

215. Organic compounds consist of the following, except which of the following:

A) Carbohydrates

B) Mineral

C) Proteins

D) None of the above

Answer
D

216. Starch is a type of:

A) Protein

B) Carbohydrate

C) Lipid

D) Mineral

Answer
B

217. The ratio of Carbon, hydrogen and Oxygen in the Carbohydrates is:

A) 1:1:2

B) 2:1:2

C) 1:2:1

D) 2:2:2

Answer
C

218. _______ are macromolecules of poly hydroxyl Aldehydes and Ketones.

A) Carbohydrates

B) Proteins

C) Lipids

D) None of the above

Answer
A

219. _________ are usually referred as Saccharide:

A) Carbohydrates

B) Proteins

C) Lipids

D) None of the above

Answer
A

220. Saccharide means _________:

A) Salty

B) Roughage

C) Sweet

D) Bitter

Answer
C
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