CBSE
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
35.4 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
If molecular weight of KMnO4 is M, then its equivalent weight in acidic medium would be
M
M/2
M/5
M/3
Which one of the following has unit positive charge and 1 amu mass ?
Electron
Neutron
Proton
None of these
Law of constant composition is same as the law of
conservation of mass
conservation of energy
multiple proportion
definite proportion
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
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
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