WBJEE SERIES Chemistry
Stoichiometry And Stoichiometric Calculations
8 previous year questions.
Volume: 8 Ques
Yield: Medium
High-Yield Trend
3
2025 1
2023 2
2022 2
2007 Chapter Questions 8 MCQs
01
PYQ 2007
medium
chemistry ID: wbjee-20
atoms of an element weigh . The atomic weight of that element is
1
290
2
180
3
34.4
4
10.4
02
PYQ 2007
medium
chemistry ID: wbjee-20
Which of the following has the smallest number of molecules?
1
mole of gas
2
of gas at
3
ot gas
4
of gas at
03
PYQ 2022
medium
chemistry ID: wbjee-20
Benzene burns in oxygen according to the above equation. What is the volume of oxygen (at STP) needed for complete combustion of grams of liquid benzene?
1
11.2 litre
2
22.4 litre
3
84 litre
4
168 litre
04
PYQ 2022
medium
chemistry ID: wbjee-20
A metal ( ) forms two oxides. The ratio (by weight) in the two oxides are and . The minimum value of atomic mass of is
1
50
2
100
3
150
4
200
05
PYQ 2023
medium
chemistry ID: wbjee-20
Arrange the following in order of increasing mass :
(i) 1 mole of N2, (ii) 0.5 mole of O3, (iii) molecules of O2, (iv) 0.5 gram atom of O2
(i) 1 mole of N2, (ii) 0.5 mole of O3, (iii) molecules of O2, (iv) 0.5 gram atom of O2
1
iv
2
iv
3
iii
4
i
06
PYQ 2025
medium
chemistry ID: wbjee-20
The compound(s) showing optical activity is/are
1
2
3
4
07
PYQ 2025
medium
chemistry ID: wbjee-20
How many oxygen atoms are present in 0.36 g of a drop of water at STP?
1
2
3
4
08
PYQ 2025
medium
chemistry ID: wbjee-20
An LPG (Liquified Petroleum Gas) cylinder weighs 15.0 kg when empty. When full, it weighs 30.0 kg and shows a pressure of 3.0 atm. In the course of usage at 27°C, the mass of the full cylinder is reduced to 24.2 kg. The volume of the used gas in cubic metre at the normal usage condition (1 atm and 27°C) is (assume LPG to be normal butane and it behaves ideally):
1
24.6 m\textsuperscript{3
2
246 m\textsuperscript{3
3
0.246 m\textsuperscript{3
4
2.46 m\textsuperscript{3