NDA CHEMISTRY QUIZ - 7

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Question 1:

Question consist of two statements – Assertion (A) and Reason (R). Answer the question selecting the appropriate option given below:
Assertion (A) - The atomic mass of an element expressed in grams is called gram atomic mass.

Reason (R) – Atomic mass of sodium is 36 g/mol .

Question 2:

Match List I and List II 

List I 

List II

A.Mass of 2 moles of calcium atoms 

I.37g

B.Mass of 1 mole of water 

II.40g

C.Equivalent mass of caustic soda 

III.80g

D.Equivalent mass of Calcium hydroxide 

IV.18g

Question 3:

One mole of carbon dioxide gas at STP is equal to____ .

  1. 6. 022 x 1023 molecules of carbon dioxide 
  2. 6.022 x 1023 atoms of carbon dioxide
  3. 44 g of carbon dioxide gas
  4. 32 g of carbon dioxide gas 

Question 4:

The question consists of two statements – Assertion (A) and Reason (R). Answer the question selecting the appropriate option given below:

Assertion(A) – One atomic mass unit is defined as a mass exactly equal to one-twelfth of the mass of one carbon - 12 atom. 

Reason (R) - In this system, 12C is assigned a mass of exactly 12 atomic mass unit (amu) and masses of all other atoms are given relative to this standard.

Question 5:

Match list 1 and list 2 

List 1 

List 2

A.Atomic mass of Sodium 

I.63g

B.Equivalent mass of Sulphuric acid 

II.98g

C.Equivalent mass of Nitric acid 

III.23 g

D.Atomic mass of Sulphuric acid 

IV.49 g

Question 6:

Mass of one atom of N-14 in grams

Question 7:

16 g of oxygen gas has same number of moles as 

Question 8:

Calculate the average atomic mass of hydrogen using the following data:

isotopes 

% Natural abundance 

Atomic Mass 

1H

99.985

1

2H

0.015

2

Question 9:

Which of the following has greater number of atoms ?

Question 10:

Which of the following pair has same number of moles ?

  1. 32 g of sulphur 
  2. 16 g of oxygen atoms 
  3. 84 g of nitrogen gas
  4. 36 g of water