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Q:

Baking soda is used ______.

 

I. for making baking powder

II. in soda-acid fire extinguishers

III. to neutralize excess acid in the stomach

 

A) Only I and II B) Only I and III
C) Only II and III D) All I, II and III
 
Answer & Explanation Answer: D) All I, II and III

Explanation:
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Q:

Carbon dioxide is one of the gases that cause the _________.

 

A) greenhouse effect   B) ozonification  
C) oven phenomenon   D) sunburn  
 
Answer & Explanation Answer: A) greenhouse effect  

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Q:

Which of the following statement(s) about acids is/are CORRECT ?
 
I. They change the color of red litmus to blue.
II. They change the color of blue litmus to red.
III. They have pH value less than 7.
 

A) Only I and III B) Only II and III
C) Only I D) Only II
 
Answer & Explanation Answer: B) Only II and III

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Q:

Who first discovered the every eighth element had properties similar to that of the first?

 

A) Newlands B) Moseley
C) Dobereiner D) Mendeleev
 
Answer & Explanation Answer: A) Newlands

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Q:

Lime water becomes white due to which gas?

 

A) CO2 B) O2
C) NO2   D) N2
 
Answer & Explanation Answer: A) CO2

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1 43702
Q:

Group 8A of the periodic table contains the

 

A) least reactive metals B) most reactive nonmetals
C) most reactive metals D) least reactive nonmetals
 
Answer & Explanation Answer: D) least reactive nonmetals

Explanation:

Helium (He), Neon(Ne), Argon(Ar), Krypton (Kr), Xenon (Xe), Radon (Rn) and Ununoctium (Uuo) are present group 8A.

 

They have fully filled orbitals and hence are most stable amongst all the elements in the periodic table and are considered as least reactive least reactive non-metals.

 

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Q:

Which of the following statements are CORRECT?

I. Esters are sweet smelling substance.
II Esters are used in making perfumes.
III. Functional group of ester is R-O-RꞋ.

 

A) Only I and II B) Only I and III
C) Only II and III D) All I, II and III
 
Answer & Explanation Answer: A) Only I and II

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Q:

Consider the following constituent gases of the atmosphere :

1. Argon

2. Neon

3. Helium

4.Ceirbon dioxide

Which one of the following is the correct ascending sequence of the above gases in terms of the volume percentage?

A) 1-3-2-4 B) 1-4-2-3
C) 4-2-3-1 D) 2-4-1-3
 
Answer & Explanation Answer: B) 1-4-2-3

Explanation:
Composition of Dry Air (Substance, % by volume)
Nitrogen, N2 78.08
Oxygen, O2
20.95
Argon, Ar 0.93
Carbon dioxide, CO2 0.033
Neon, Ne 0.0018
Helium, He 0.00052
Methane, CH4 0.0002
Krypton, Kr 0.00011
Dinitrogen oxide, N2O 0.00005
Hydrogen, H2 0.00005
Ozone, O3 0.000001
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