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Q.

Four different experiments were conducted in the following ways
I) 3 g of carbon was burnt in 8 g of oxygen to give 11 g of CO2    
II) 1.2  g of carbon was burnt in air to give 4.2 g of CO2.
III) 4.5 g of carbon was burnt in enough air to give 11 g of  CO2.
IV) 4 g of carbon was burnt in oxygen to form 30.3 g of  CO2.
Law of constant proportions is illustrated in experiment (s)

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a

I and III only

b

II and III only 

c

IV only

d

I only  

answer is D.

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Detailed Solution

C+O2CO2

1 mole of carbon – 12 g
1 mole of  O2 - 32 g
By simple ratio 3 : 8 combine to form CO2.

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