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Q:

Which of the following statement(s) is/are CORRECT?

I. Acids are sour in taste and generate H+ ions.

II. Acids are sour in taste and generate OH– ions.

III. Bases are bitter intaste and generate OH– ions.

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

Explanation:
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Q:

Which one of the following statements is not correct?

 

A) Fischer projection represents the molecule in an eclipsed conformation B) Newman projection can be represented in eclipsed, staggered and skew conformations
C) Fischer projection of the molecule is its most stable conformation D) In Sawhorse projections, the lines are inclined at an angle of 120 deg to each other.
 
Answer & Explanation Answer: C) Fischer projection of the molecule is its most stable conformation

Explanation:

Fischer projections were originally proposed for the depiction of carbohydrates and used by chemists, particularly in organic chemistry and biochemistry.A Fischer projection always uses an eclipsed conformation. A Newman diagram can represent either an eclipsed conformation or a staggered conformation or a skew conformation.

 

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Q:

Which of the following is used as a catalyst in the hydrogenation of vegetable oil?

 

A) He B) H2
C) Ni D) Pb
 
Answer & Explanation Answer: C) Ni

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Q:

Which of the following is a property of an acid?

 

A) Acids reacts with metals B) Acids taste sour
C) Acids turn blue litmus paper red D) All the above
 
Answer & Explanation Answer: D) All the above

Explanation:

The general properties of acids are as follows :-

1.They are sour to taste.

2.They turn blue litmus paper red but the red litmus paper have no effect of acids and it remains unaffected.

3.They release hydrogen ions H+ in the solution medium, making the conditions acidic.

 

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Q:

Which one of the following is not a mixture

A) air B) mercury
C) milk D) cement
 
Answer & Explanation Answer: B) mercury

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Q:

Which of the following statements is Incorrect?

 

A) The particles of matter have spaces between them B) The particles of matter are extremely small
C) The particles of matter attract each other D) The particles of matter are in stationary state
 
Answer & Explanation Answer: D) The particles of matter are in stationary state

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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

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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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