ICSE Class 10 Chemistry 2020 Solved Paper

The following table represent the elements and the atomic number.
With reference to this, answer the following using only the alphabets given in the table.

Element	Atomic number
P	13
Q	7
R	10

Question : 40

Total: 86

Which element combines with hydrogen to form a basic gas ?

Solution:

Q.
Q is 7 i.e., Nitrogen which combines with hydrogen to form a basic gas ammonia.

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