CBSE
Multiple Choice QuestionsWhat is the formula of bleaching powder?
CaO(OCl)
Ca(OCl)Cl
Ca(OCl)2
Ca(OCl)2Cl
Plaster of paris is
CaSO4.H2O
CaSO4.2H2O
CaSO4.H2O
CaSO4.4H2O
Which of the following carbonates decomposes readily at low temperatures ?
Na2CO3
K2CO3
Li2CO3
Rb2CO3
Na2S2O3 + I2 Product is
Na2S
Na2SO4
Na2S4O6
S2
The solubility of carbonates decreases below the magnesium group due to decrease in:
Lattice energies of solids
inter-ionic attraction
hydration energies of cations
entropy of solution formation
Salt of thiosulphruic acid is sodium thiosulphate which is used in
Photography for fixing
Submarines
Space capsules
Petroleum refining
Bleaching powder is obtained by treating Cl2 with
Ca(OH)2
CaO
CaCO3
CaCl2
On dissolving moderate amount of sodium metal in liquid NH, at low temperature, which one the following does not occur?
Na+ ions are formed in the solution
Blue coloured solution is obtained
Liquid NH3 becomes good conductor of electricity.
Liquid ammonia remains diamagnetic
Which of the following statements is false ?
CaOCl2 gives OH- Cl- and OCl- in aqueous solution
Diamond and graphite are allotropes of carbon
Bleaching action of Cl2 in moist condition is not permanent
Calomel is Hg2Cl2
Ammonia gas can be dried over
CaCl2
conc. H2SO4
P2O5
quick lime
