Lithium has the minimum tendency to form ion. The aqueous solution of lithium is the
1. Strongest reducing agent.
2. Poorest reducing agent.
3. Strongest oxidising agent.
4. Poorest oxidising agent.
Calcium hydride can be obtained by heating :
1. Calcium oxide with hydrogen.
2. Calcium oxide with hydrogen under pressure.
3. Calcium with hydrogen under pressure.
4. Calcium with hydrogen at a very low temperature.
Calcium hydroxide upon reacting with moist chlorine forms-
A blue colored solution of an alkali metal in liq NH3 is due to the presence of -
2. ions .
3. Solvated anions .
4. Solvated electrons.
Alkali metal ions are-
1. Diamagnetic and coloured.
2. Diamagnetic and colourless.
3. Paramagnetic and coloured.
4. Paramagnetic and colourless.
A compound X on heating gives a colourless gas. The residue is dissolved in water to obtain Y. Excess is bubbled through an aqueous solution of Y, and Z is formed. Z on gentle heating gives back X. The compound X is-
Magnesia can be prepared by -
1. Burning Mg in air.
2. Heating hydroxide, nitrate, sulphate or carbonate of magnesium.
3. Heating Mg in steam.
4. All of the above.
A compound insoluble in acetic acid is -
1. Calcium oxide.
2. Calcium carbonate.
3. Calcium oxalate.
4. Calcium hydroxide.
The incorrect statement regarding Be(II group) is -
1. It forms an ionic carbide.
2. Its carbonate decomposes on heating.
3. Its halides are covalent.
4. It is easily attacked by water.
Ca, on exposure of the moist air, forms a layer on its surface as :