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-
1.
2.
3.
4.
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.
A blue coluored solution of an alkali metal in liq NH3 is due to the presence of -
1. atoms.
2. ions .
3. Solvated anions .
4. Solvated electrons.
Calcium hydroxide upon reacting with moist chlorine forms-
1.
2.
3.
4.
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.
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.
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 :
1.
2.
3.
4. CaO