CBSE
Multiple Choice Questions35.4 ml of HCl is required for the neutralization of a solution containing 0.275 g of sodium hydroxide. The normality of hydrochloric acid is ?
0.97 N
0.142 N
0.194 N
0.244 N
When 10g of 90% pure lime stone is heated completely, the volume (in litres) of CO2 is liberated at STP is
22.4
2.24
20.16
2.016
The value of amu is which of the following ?
1.57 × 10-24 kg
1.66 × 10-24 kg
1.99 × 10-23 kg
1.66 × 10-27 kg
Law of constant composition is same as the law of
conservation of mass
conservation of energy
multiple proportion
definite proportion
Which one of the following has unit positive charge and 1 amu mass ?
Electron
Neutron
Proton
None of these
2g of mixture of CO and CO2 on reaction with excess I2O5 produced 2.54g of I2. What would be the mass% of CO2 in the original mixture?
60
30
70
35
By dissolving 5 g substance in 50 g of water, the decrease in freezing point is 1.2°C. The gram molal depression is 1.85°C. The molecular weight of substance is :
105.4
118.2
137.2
154.2
4.6 x 1022 atoms of an element weigh 13.8g. The atomic weight of that element is
290
180
34.4
10.4
Which of the following has the smallest number of molecules ?
0.1 mole of CO2 gas
11.2 L of CO2 gas at STP
22 g of CO2 gas
22.4 x 103 mL of CO2 gas at STP
If molecular weight of KMnO4 is M, then its equivalent weight in acidic medium would be
M
M/2
M/5
M/3
