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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:

What is the chemical formula for Sodium Chloride (Salt)?

A) NaCl2 B) NaCl
C) Na2Cl D) Na2C
 
Answer & Explanation Answer: B) NaCl

Explanation:
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Q:

Which of the following bonds are weakest in nature?

A) Single bond B) Double bond
C) Triple bond D) Hydrogen bond
 
Answer & Explanation Answer: D) Hydrogen bond

Explanation:
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Q:

Which of the following is NOT a primary green house gas in the earth's atmosphere?

A) Methane B) Ozone
C) Nitrous oxide D) Hydrogen
 
Answer & Explanation Answer: D) Hydrogen

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Q:

The Chemical formula of Methanol is _____.

A) C2H5OH B) CH3(OH)2
C) CH3OH D) CH4OH
 
Answer & Explanation Answer: C) CH3OH

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Q:

The oceanic crust mainly consists of silica and __________.

A) magnesium B) iron
C) manganese D) sulphur
 
Answer & Explanation Answer: A) magnesium

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Q:

Which one of the following is a physical change?

A) Burning of coal B) Burning of wood
C) Heating of a platinum crucible D) Heating of potassium chlorate
 
Answer & Explanation Answer: C) Heating of a platinum crucible

Explanation:

In Burning of coal, burning of wood and Heating of Potassium Chlorate there will be some sort of chemical change, but Heating of a Platinum crucible is a physical change.

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Q:

An element A forms an oxide with formula A3O4. What is the valency of element A?

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

Explanation:
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