On heating Li2CO3 and Na2CO3.10H2O, residue is left after heating. The weight loss is due to
1. Evolution of CO2 from Na2CO3.10H2O only
2. Evolution of CO2 from Li2CO3 only
3. Due to evolution of CO2 from Li2CO3 and H2O from Na2CO3.10H2O
4. H2O from Na2CO3.10H2O
Ionic mobility of which of the following alkali metal ions is lowest when an aqueous solution of their salts are put under an electric field?
(1) Na
(2) K
(3) Rb
(4) Li
The suspension of slaked lime in water is known as -
1. Limewater.
2. Quicklime.
3. Milk of lime.
4. Aqueous solution of slaked lime.
The incorrect statement among the following regarding Beryllium is-
1. It is rendered passive by nitric acid.
2. lt forms Be2C
3. It's salts rarely hydrolyze.
4. It's hydride is electron-deficient and polymeric.
"Metals are usually not found as nitrates in their ores'"
Out of the following two (I and II) reasons which is/are true for the above observation?
I. Metal nitrates are highly unstable.
II. Metal nitrates are highly soluble in water.
1. I and ll are true
2. I and II are false
3. I is false but ll is true
4. l is true but ll is tase
A compound that releases CO2 most easily upon heating is -
1. K2CO3
2. Na2CO3
3. MgCO3
4. CaCO3
An active ingredient in bleaching powder for bleaching action is -
1. Ca(OCl)2
2. CaO2Cl
3. CaCl2
4. CaOCl2
An alkaline earth metal sulphate that has hydration enthalpy higher than the lattice enthalpy is -
1. CaSO4
2. BeSO4
3. BaSO4
4. SrSO4
Property of the alkaline earth metals that increases with their atomic number is -
1. Solubility of their hydroxides in water.
2. Solubility of their sulphates in water.
3. Ionisation energy.
4. Electronegativity.
In the case of alkali metals, the covalent character decreases in the order
1. MCl>MI>MBr>MF
2. MF>MCl>MBr>MI
3. MF>MCl>MI>MBr
4. MI>MBr>MCl>MF