Quiz 20- Chemistry-General Science: General Knowledge Question & Answers

191 Q) "Consider the following statements 

I.Fuels with low octane numbers are ideal for diesel engines. 

II.Use of gasoline with low octane numbers may lead to the problem of engine knocking. 

Which of the statements given above is/are correct?"

(a) Only I

(b) Only II

(cj Both I and II

(d) Neither I nor II

Show Answer

C

192 Q) "Two atoms are said to be isotopes if "

(a)they have the same atomic number, but different mass numbers

(b)they have the same number of neutrons, but different mass numbers

(c)the sum of the number of protons and neutron is the same, but the number of protons is different

(d)they have the same number of neutrons, but different modes of radioactive decay

Show Answer

A

193 Q) "Consider the following statements 

I.Phosgene is a poisonous compound forms from chloroform in the presence of UV-rays and 02. 

II.It is used for the synthesis of precursor for the poly-urethane polymer. Which of the statements given above is/are correct?"

(a)Only I

(b) Only II

(c) Both I and II

(d) Neither I nor II

Show Answer

C

194 Q) Which one among the following is not a periodic property i.e., does not show any trend on moving from one side to the other in the Periodic Table?

(a) Atomic size

(b) Radioactivity

(c) Valency

(d) Electronegativity

Show Answer

B

195 Q) "Consider the following statements 

I.Hard soaps (common bar soaps) are the sodium salts of fatty acids. 

II.Soft soaps are the potassium salts of fatty acids and semi-solid in nature. 

Which of the statements given above is/are correct?"

(a)Only I

(b) Only II

(c) Both I and II

(d) Neither I nor II

Show Answer

C

196 Q) Which of the following is used in the industrial manufacture of Vitamin-A?.

(a) Na2C2

(b) Li2C2

(c) C60K

(d) LiC2H

Show Answer

D

197 Q) Which one of the following is used as an anti-freezer, which effectively depresses the freezing point of water in an automobile?.

(a)Ethylene glycol

(b) Propanoic acid

(c) Glutamic acid

(d) Glycolic acid

Show Answer

A

198 Q) "Aqua-regia used by alchemist to separate silver and gold is a mixture of "

(a)concentrated HNO, and concentrated h2so4

(b)concentrated HC1 and concentrated h2so4

(c)concentrated HN03 and concentrated HC1

(d)dilute HN03 and dilute HC1

Show Answer

C

199 Q) "Why hard water does not give lather with soap?. "

(a)Hard water contains calcium and magnesium ions which form precipitate with soap.

(b)Hard water contains sulphate and chloride ions which form precipitate.

(c)pH of hard water is high.

(d)pH of hard water is less.

Show Answer

A

200 Q) "Consider the following statements 

I.Pyrex glasses have boron oxide as main cor.otituent besides silica. 

II.Pyrex glasses have high thermal expansion, thus less vulnerable to cracking from thermal shock. 

III.They are commonly used for reagent bottles, optical components and household cookware.

 Which of the statements given above is/are correct?"

(a) I, II and III

(b) I and III

(cj II and III

(d) Only II

Show Answer

B