What is the stoichiometric coefficient of Ca in the reaction?
Ca + Al3+ → Ca2+ + Al
2
1
3
4
One atom of an element weights 1. 8 × -1022g, its atomic mass is
29.9
18
108. 36
154
The amount of H2S required to precipitate 1.69 g BaS from BaCl2 solution is
3.4 g
0.24g
0.34 g
0. 17 g
The number of atoms in 0.1 mol of a triatomic gas is.
4. 026 × 1023
5. 02 × 1023
1.806 × 1023
6. 02 × 1013
The standard adopted for the determination of atomic weight of elements is based on
H1
C12
O16
S32
4.48 L of methane at STP corresponds
1.2 × 1022 molecules of methane
0. 5 mole of methane
3. 2g of methane
0.1 mole of methane
Mass of 0.1 mole of methane is
1g
0.1g
16g
1.6g
A mixture containing 2 mol each of H2 and O2 is ignited so that water is formed. The amount of water formed is
18g
36g
1.8g
Which of the following is not correct regarding 14 g of CO ?
It corresponds to 0.05 mole of co
It occupies 2.24 L at STP
It corresponds to 3.01 × 1023 molecules of CO
It corresponds to same number of moles of CO2 and nitrogen oxide gases.
32g of O2, 2g of H2, 28g of N2 at NTP, occupy separately a volume of
1L
2L
22. 4L
2. 24L
