1.1 Some Basic Concept of Chemistry

Question 1

How many moles of lead(ii) chloride will be formed from a reaction between 6.5g og PbO and 3.2 g
Pb + 2HCl —> PbCl2 + H2O

1) 0.011
2) 0.029
3) 0.044
4) 0.333

Answer 1

2)

Question 2

Equal msses of H2, O2 and methane taken in a container of volume V at temperature 27C in identical conditions . The ration of volumes of gases H2 : O2 :methane would be :

1) 8:16:1
2) 16:8:1
3) 16:1:2
4) 8:1:2

Answer 2

3)

Question 3

Initially a container of 1 g of gas A has 4 atm pressure at constant temperature. If 2 g of gas B is added in same container at same temperature then the ratio of the moleclar weight of A and B is ?

Answer 3

Mb : 4 Ma

Question 4

If 3.01 x 10 ^ 20 molecules are removed from 98mg of H2SO4 then the number of moles of H2SO4 left are :

Answer 4

0.5 x 10^(-3)

take note of the unit of h2so4