NCERT Question 6 (a) - Chapter 1 Class 10 - Chemical Reactions and Equations

Last updated at July 14, 2026 by

Balance the following chemical equations.

(a) HNO 3 +Ca(OH) 2 → Ca(NO 3 ) 2 + H 2 O

 

 

Answer

  • HNO 3 + Ca(OH) 2 → Ca(NO 3 ) 2 + H 2 O

 

Name of the element

No. of atoms in Reactants

No. of atoms in products

Hydrogen

3

2

Nitrogen

1

2

Oxygen

5

7

Calcium

1

1

 

To balance Nitrogen,

Multiply HNO 3 by 2

2 HNO 3 + Ca(OH) 2 → Ca(NO 3 ) 2 + H 2 O



Name of the element

No. of atoms in Reactants

No. of atoms in products

Hydrogen

4

2

Nitrogen

2

2

Oxygen

8

7

Calcium

1

1

 

To balance Hydrogen,

Multiply H 2 O by 2

2 HNO 3 + Ca(OH) 2 → Ca(NO 3 ) 2 + 2 H 2 O

 

Name of the element

No. of atoms in Reactants

No. of atoms in products

Hydrogen

4

4

Nitrogen

2

2

Oxygen

8

8

Calcium

1

1

 

Now, all the elements are balanced and the balanced equation is

2 HNO 3 + Ca(OH) 2 → Ca(NO 3 ) 2 + 2 H 2 O

 

2 HNO 3 + Ca(OH) 2 → Ca(NO 3 ) 2 + 2 H 2 O



 

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