The mass of potassium dichromate crystals required to oxidize 750 of 0.6 M Mohr’s salt solution is (Given, molar mass, potassium dichromate = 294, Mohr’s salt = 392)
1. 0.39 g
2. 0.37 g
3. 22.05 g
4. 2.2 g
A quantity of hydrogen gas occupies a volume of 30.0 mL at a certain temperature and pressure. What volume would half this mass of hydrogen occupy at triple the absolute temperature if the pressure were one ninth that of the original gas?
1. 270 mL
2. 90 mL
3. 405 mL
4. 137 mL
Choose the incorrect statement among the following.
1. The chemistry of different lanthanoids is very similar
2. 4f and 5f-orbitals are equally shielded
3. D-block element show irregular and erratic chemical properties among themselves
4. La and Lu have partially filled d-orbitals and no other partially filled orbitals.
The Zone refining process of metals is based on the principle of
1. excess noble character of the liquid metal than that of impurity
2. lower melting point of the impurity than that of pure metal
3. greater solubility of impure metal than that of impurity
4. greater solubility of the impurities in the molten state than in the solid