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Q:

The element with the highest electron affinity among halogens is

A) F B) I
C) Cl D) Br
 
Answer & Explanation Answer: C) Cl

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Q:

Which among the following is used to generate light, to weld metals?

A) Ethylene B) Acetylene
C) Glycol D) Oxalic acid
 
Answer & Explanation Answer: B) Acetylene

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Q:

Which of the following elements has the lowest melting point?

A) Helium B) Potassium
C) Tungsten D) Sulphur
 
Answer & Explanation Answer: A) Helium

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Q:

What  is  the  number  of  atoms  in  46  g  of sodium-23 (N = Avogadro constant)?

A) N/2 B) N
C) 2N D) 23 N
 
Answer & Explanation Answer: C) 2N

Explanation:
Number of atoms in 46 grams of sodium - 23 will be 2N.
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Q:

The depletion in Ozone layer is caused by ___________ .

A) Nitrous oxide B) Carbon dioxide
C) Chlorofluorocarbons D) Methane
 
Answer & Explanation Answer: C) Chlorofluorocarbons

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Q:

Which of the following is not a Halon gas ?

A) methane B) Carbon tetra chloride
C) iodomethane D) bromomethane
 
Answer & Explanation Answer: A) methane

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Q:

Which of the following constitutes highest percentage of Green House gases?

A) Ethane B) Methane
C) Carbon Dioxide D) Propane
 
Answer & Explanation Answer: C) Carbon Dioxide

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Q:

Which of the following statements is INCORRECT?

A) Solids have definite volume  B) solids are rigid 
C) Solids have indefinite shape  D) Solids are almost incompressible
 
Answer & Explanation Answer: C) Solids have indefinite shape 

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