BITSAT 2017 Slot 2 Solved Paper

∵ Only one mole of total gases are evolved and H2O decomposes as
H2O

decomposition

───────▸

H2+

1

2

O2
i.e. total moles =1+

1

2

=

3

2

moles by one mole of H2O
Now, ∵

3

2

moles of gases are evolved by =1 mole of H2O
∴1 mole of gases are evolved by =

1

3∕2

=

2

3

Hence, 1 mole of total gases are evolved by

2

3

mole of H2O.