The concentration of 69% nitric acid (by mass) in a sample with a density of 1.41 g / mL will be-
1. 15.44 mol/L
2. 17.14 mol/L
3. 20.06 mol/L
4. 12.26 mol/L
The mass of ammonia produced when 2.00 × 103 g dinitrogen reacts with 1.00 ×103 g of dihydrogen is:
1. | 2338.11 g
|
2. | 2428.57 g
|
3. | 2712.24 g
|
4. | 2180.56 g |
The total number of electrons present in 1.4 g of dinitrogen gas are -
1.
2.
3.
4.
The mass of sodium acetate (CH3COONa) required to make 500 mL of 0.375 molars aqueous solution would be -
Molar mass(sodium acetate) = 82.0245 g/mol
1. 17.86g
2. 31.76g
3. 20.34g
4. 15.38g
The empirical formula of an oxide of iron, which has 69.9% iron and 30.1% oxygen by mass is -
1. FeO
2. Fe2O3
3. Fe3O4
4. Fe3O2
If wheat grains are distributed each second, the time taken to distribute one Avogadro number of wheat grains would be -
A reading on Fahrenheit scale is . The same reading on celsius scale will be :
1. | 40°C | 2. | 94°C |
3. | 93°C | 4. | 30°C |
If 500 mL of a 5 M solution is diluted to 1500 mL, the molarity of the resultant solution is:
1. 1.5 M
2. 1.66 M
3. 0.017 M
4. 1.59 M
The mass percent of carbon in carbon dioxide is :
1. | 0.034% | 2. | 27.27% |
3. | 3.4% | 4. | 28.7% |
The incorrect statement among the following is:
1. | A molecule of a compound has atoms of different elements. |
2. | A compound can not be separated into its constituent elements by the physical method of separation. |
3. | A compound retains the physical properties of its constituent elements. |
4. | The ratio of atoms of different elements in a compound is fixed. |