CBSE
The solubility of saturated solution of Ag2CrO4 is s mol L-1. What is its solubility product?
4s3
s3
2s3
16s2
The one which has least iodine value is
sunflower oil
ginger oil
ghee
groundnut oil
At 25°C, the dissociation constant of a base, BOH, is 1.0 x 10-12. The concentration of
hydroxyl ions in 0.01 M aqueous solution of the base would be
2.0 x 10-6 mo L-1
1.0 x 10-5 mo L-1
1.0 x 10-6 mo L-1
1.0 x 10-7 mo L-1
The number of phase in a colloidal system is
1
2
3
4
What is the correct relationship between the pHs of isomolar solutions of sodium oxide (pH1), sodium sulphide (pH2), sodium selenide (pH3) and sodium telluride (pH4)?
pH1 > pH2 pH3 > pH4
pH1 < pH2 pH3 < pH4
pH1 < pH2 pH3 pH4
pH1 > pH2 pH3 > pH4
Steel is heated to below red heat and then, cooled slowly. The process refers to
hardening
annealing
tempering
nitriding
Which does not give a precipitate with AgNO3 solution?
[Co(NH3)6]Cl3
[Co(NH3)5Cl]Cl2
[Co(NH3)4Cl2]Cl
[Co(NH3)3Cl3]
Which of the following would exert maximum osmotic pressure?
Decinormal aluminium sulphate
Decinormal barium chloride
Decinormal sodium chloride
A solution obtained by mixing equal volumes of (b) and (c) and filtering
The vapour pressure of 100g water reduces from 3000 Nm-2 to 2985 Nm-2 when 5g of substance 'X' is dissolved in it. Substance 'X' is
methanol
glucose
carbon dioxide
cannot predict
A solution of urea (mol. mass 56g mol-1) boils at 100.18°C at the atmospheric pressure. If kf and kb for water are 1.86 and 0.512 K kg mol-1 respectively, the above solution will freeze at
-6.54°C
6.54°C
0.654°C
- 0.654°C