411.

Which salt on heating, does not give brown gas on heating ?

• LiNO₃

• AgNO₃

• Pb(NO₃)₂

• KNO₃

When magnesium is heated , the another compound formed with MgO is :

• Mg₃N₂

• Mg(NO₃)₂

• MgCO₃

• Mg(NO₃)₃

The prefix word 'alkali' for alkaline metals shows :

• lustre of silver

• ashes of plant

• metallic nature

• active metal

Potassium nitrate is called :

• Mohr's salt

• Chile salt petre

• Indian salt petre

• Gypsum

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