Argol, a brown crust, formed during the fermentation of grape juice contains
CO2
fused oil
potassium hydrogen tartarate
lye
The pH value of 0.001 M aqueous solution of NaCl is
7
4
11
unpredictable
A.
7
NaCl is a neutral salt, thus the pH value of its aqueous solution is 7.
Which buffer solution comprising of the following has its pH value greater than 7?
CH3COOH + CH3COONa
HCOOH + HCOOK
CH3COONH4
NH4OH + NH4Cl
10-6 M NaOH is diluted 100 times. The pH of the diluted base is
between 7 and 8
between 5 and 6
between 6 and 7
between 10 and 11
Which of the following is correct?
The pH of one litre solution containing 0.49 g of H2SO4 is 2.0
The conjugate base of H2S is S2-
BF3 is a Lewis base
Phenolphthalein is colourless in basic medium
Which of the following is correct ?
Catalyst undergoes permanent chemical change
Particle size of solute in true solution is 10-3 m
Starch solution is a hydrosol
Hydrolysis of liquid ester in the presence of mineral acid is an example of heterogeneous catalysis reactions
A 0.1 aqueous solution of a weak acid is 2% ionised. If the ionic product of water is 1 x 10-4, the [OH-] is
5 x 10-12 M
2 x 10-3 M
1 x 10-14 M
None of these
Disperse phase and dispersion medium in butter are respectively
solid and liquid
liquid and solid
liquid and liquid
solid and solid