Potassium nitrate is called :

• Mohr's salt

• Chile salt petre

• Indian salt petre

• Gypsum

42.

KMnO₄ in alkaline medium changes to

• Mn³⁺

• MnO₂

• MnO${}_4^{2-}$

• Mn(OH)${}_4^{-}$

Which of the following has highest hydration energy?

• MgCl₂

• CaCl₂

• BaCl₂

• SrCl₂

Which of the following reactions produces hydrogen?

• Mg + H₂O

• H₂S₂O₈ + H₂O

• BaO₂ + HCl

• Na₂O₂ + 2HCl

Assertion : BeSO₄ is soluble in water while BasO₄ is not.

Reason : Hydration energy decreases down the group from Be to Ba and lattice energy remains almost constant.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false

• If both assertion and reason are false.

The first ionisation enthalpy of Na, Mg and Si are 496, 737, 776 kJ/mol respectively. What will be the first ionisation enthalpy potential of Al in kJ/mol?

• > 766 kJ/ mol

• > 496 and < 737 kJ

• >737 and < 766 kJ/mol

• >496 kJ/mol

Bleaching powder does not contain

• CaCl₂

• Ca(OH)₂

• Ca(OCl)₂

• Ca(ClO₃)₂

When NaCl is dissolved in water , the sodium ions becomes :

• oxidised

• reduced

• hydrolysed

• hydrated

The temporary hardness of water due to calcium bicarbonate can be removed by adding :

• CaCO₃

• Ca(OH)₂

• CaCl₂

• HCl

Which one does not form oxide on heating ?

• ZnCO₃

• CaCO₃

• Li₂CO₃

• Na₂CO₃