The element which does not dissolve in caustic soda is:
1. silicon
2. aluminium
3. zinc
4. cadmium
The principal products obtained on heating iodine with concentrated caustic soda solution are:
1. NaOI + NaI
2. NaIO3 + Nal
3. NaOI + NaIO3 + NaI
4. NaIO4 + NaI
When sulphur is heated with NaOH(aq) the compounds formed are:
(1) Na2S + H2O
(2) Na2SO3 + H2O
(3) Na2S + Na2S2O3 + H2O
(4) Na2S2O3 + H2O
NaOH is prepared by the electrolysis of:
1. aqueous solution of sodium chloride with platinum electrodes
2. molten sodium chloride with graphite anode and iron cathodes
3. sodium carbonate with platinum electrodes
4. sodium carbonate with nickel electrodes
Nitrates of I group (except LiNO3) on heating give:
1. O2
2. N2
3. NO
4. NO2
Sodium carbonate on heating gives:
1. water vapours
2. carbon dioxide
3. carbon dioxide + water vapour
4. none of the above
Microcosmic salt has the formula:
1. Na2HPO4.2H2O
2. (NH4)2HPO4.2H2O
3. Na(NH4)HPO4.4H2O
4. none of these
Which salt will not impart color to flame?
1. LiCl
2. MgCl2
3. CaCl2
4. KI
Superoxide is formed on heating with an excess of air by:-
1. Li, Na
2. Mg, Be
3. Na, K
4. K, Rb
Sodium carbonate solution in water is alkaline due to
(1) hydrolysis of
(2) hydrolysis of
(3) hydrolysis of and ions
(4) none of these
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
A compound that releases CO2 most easily upon heating is -
1. K2CO3
2. Na2CO3
3. MgCO3
4. CaCO3
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.
Among the carbonates of alkali metals which one has highest thermal stability?
(1)
(2)
(3)
(4)