An active ingredient in bleaching powder that aids in the bleaching action is:
1.
2.
3.
4.
Solubility of alkaline earth metal sulphates in water decreases in the sequence:
1. Mg > Ca > Sr >Ba
2. Ca > Sr > Ba > Mg
3. Sr > Ca > Mg > Ba
4. Ba > Mg > Sr > Ca
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 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.
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.
The polarising power of Mg is close to that of –
1. Na
2. Cs
3. Li
4. K
The incorrect statement among the following regarding Lithium is that-
1. The hydroxide, carbonate and nitrate decompose to give the oxide on heating.
2. It is the most electronegative element of group IA.
3. The hydrogen carbonate cannot be isolated as a stable solid.
4. It forms superoxide.
An amphoteric oxide among the following is-
1. CaO
2. SrO
3. BeO
4. MgO