CBSE
Multiple Choice QuestionsThe 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
The solubility of saturated solution of Ag2CrO4 is s mol L-1. What is its solubility product?
4s3
s3
2s3
16s2
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]
The number of phase in a colloidal system is
1
2
3
4
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
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
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
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
The one which has least iodine value is
sunflower oil
ginger oil
ghee
groundnut oil
