Sodium reacts with water less vigorously than potassium because-
1. It has a higher atomic weight.
2. It is less electropositive .
3. It is more electronegative.
4. It is a metal .
The correct relation about the density of Na and K is
1. Na > K
2. Na = K
3. K > Na
4. Li > K
The reason for a lower basicity of hydroxides of alkaline earth metals than alkali metals is :
1. Alkali metals form ionic compounds.
2. The bond strength of oxygen is more for alkali metals.
3. The electropositivity of alkali metals is more than alkaline earth metals.
4. The electropositivity of alkali metals is less than alkaline earth metals.
The number of crystal water in Gypsum, Plaster of Paris and Epsom salt respectively are-
1. 2, 0.5, 7
2. 7, 2, 1
3. 7, 0.5, 2
4. 3, 4, 2
An amphoteric oxide among the following is-
1. CaO
2. SrO
3. BeO
4. MgO
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.
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.