Which of the following reactions does not involve liberation of oxygen?

• XeF₄ + H₂O → 

• XeF₄ + O₂F₂ → 

• XeF₂ + H₂O → 

• XeF₆ + H₂O → 

Which one of the following statements is not correct?

• The hydration enthalpies of alkali metal ions decrease down the group.

• LIthium halides are some what covalent in nature

• Alkali metals react with water liberating oxygen gas

• KO₂ is paramagnetic.

The formula of phosphate of a metal, M is MPO₄. The formula of its nitrate will be

• M NO₃

• M (NO₃)₂

• M (NO₃)₃

• M₂(NO₃)₃

The formula of phosphate of a metal, M is M NH₄PO₄. The formula of its sulphate will be

• M SO₄

• M (SO₄)₂

• M₂SO₄

• M₂ (SO₄)₃

With the increase in atomic weights, melting points of the alkali metals

• increase

• decrease

• remain constant

• do not show definite trend

Alkali metals in each period have

• smallest size

• owest ionization potential

• highest ionisation potential

• highest electronegativity

77.

In potassium manganate, the oxidation state of manganese is

• +5

• +6

• +7

• +8

The reactivity of the alkali metal sodium with water, is made use of

• in drying of alcohols

• in drying of benzene

• in drying of organic amines

• as a general drying agent

The bleaching action of the bleaching powder is due to the liberation of

• chlorine

• molecular oxygen

• nascent oxygen

• calcium carbonate

Calcium carbide reacts with water to produce

• methane

• ethane

• ethylene

• acetylene