Potassium is kept-
1. Under cold water.
2. In ammonia.
3. In alcohol.
4. In kerosene.
KOH can be prepared-
(1) By the electrolysis of potassium chloride solution
(2) By the action of barium hydroxide on potassium sulphate
(3) By the action of lime on potassium chloride
(4) By the action of lime on potassium carbonate.
Magnesium can be prepared by heating-
(1) MgCl2 with CaO at 1775 K
(2) MgCl2 with CaC2 at 1775 K
(3) MgCl2 with Ca(OH)2 under pressure
(4) MgO with CaC2 at ordinary temperature
Nitrolim (a nitrogenous fertilizer) is a mixture of-
1. Calcium carbide and calcium cyanamide.
2. Calcium oxide and calcium carbide.
3. Calcium cyanamide and carbon.
4. Calcium oxide and carbon.
The strongest base among the following is-
1. Al(OH)3
2. Mg(OH)2
3. Ca(OH)2
4. Ba(OH)2
When magnesium ribbon is heated to redness in an atmosphere of nitrogen and subsequently cooled with water, the gas evolved is-
(1) N2
(2) NH3
(3) H2
(4) CO2
The ion of which of the following metals has least ionic conductivity in the aqueous solution-
(1) Lithium
(2) Sodium
(3) Potassium
(4) Rubidium
Magnesium hydride can be prepared by the action of-
(1) Lithium hydride on magnesium chloride
(2) Aluminium hydride on magnesium chloride
(3) Lithium aluminium hydride on magnesium chloride
(4) Lithium magnesium hydride on lithium chloride
Which of the following is not the characteristics of alkali metals –
1. Low m.p.
2. Low electronegativity
3. High ionisation energies
4. Their ions are isoelectronic with noble gases
Calcium can be obtained by the electrolysis of-
1. CaCl2 and CaF2
2. Ca(OH)2
3. CaCl2
4. CaF2