The correct statement(s) among the following options is/are:
1. | Sodium metal reacts violently with water. |
2. | Sodium metal is heated in a free supply of air to give sodium peroxide. |
3. | Sodium peroxide is dissolved in water to give sodium hydroxide. |
4. | All of the above. |
The chemical formula of Plaster of Paris is:
1.
2.
3.
4. 3CaSO4.H2O
The formula of washing soda is:
1. Na2CO3
2. Na2CO3.H2O
3. Na2CO3.7H2O
4. Na2CO3.10H2O
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
A compound that has higher hydration enthalpy than the lattice enthalpy is:
1.
2.
3.
4.
The correct statement regarding the dissolution of alkali metal in liquid ammonia is -
1. Ammoniated electron form.
2. Metal appear red in colour.
3. Metal gain electron.
4. Metal ammonia complex forms.
The strongest base among the following is-
1.
2.
3.
4.
Baking soda or baking powder is:
1. Washing soda
2. Caustic soda
3. Soda ash
4. Sodium bicarbonate
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.
An alkaline earth metal sulphate that has hydration enthalpy higher than the lattice enthalpy is -
1. CaSO4
2. BeSO4
3. BaSO4
4. SrSO4