The largest value of among the following is -
1.
2.
3.
4.
The polarising power of Mg is close to that of –
1. Na
2. Cs
3. Li
4. K
The incorrect statement among the following is-
1. Alkali metals are more electropositive than alkaline earth metals.
2. Alkaline earth metals are denser and harder than alkali metals.
3. An alkali metal's electronic configuration is ns1 and an alkaline earth metal's electronic configuration is ns2
4. The first IP of alkali metals is more than that of alkaline earth metals.
Potassium is kept-
1. Under cold water.
2. In ammonia.
3. In alcohol.
4. In kerosene.
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.
2.
3.
4.
Ca, on exposure of the moist air, forms a layer on its surface as :
1.
2.
3.
4. CaO
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.
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.