MEDIUM
JEE Main/Advance
IMPORTANT
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The following equilibrium exists in a saturated solution of NH4Cl.

 NH4Cl(S)NH4+(aq)+Cl(aq) ΔH25°C=3.5 kcal mol-1
A change that will shift the equilibrium to the right is

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Important Questions on Equilibrium

MEDIUM
JEE Main/Advance
IMPORTANT
For the reaction Ag(CN)2-(aq)Ag+(aq)+2CN-(aq), the Kc at 25°C is 4×10-19. Then [Ag+] in solution which was originally 0.1 M in KCN and 0.03 M in AgNO3 will be
HARD
JEE Main/Advance
IMPORTANT

A solution of Na2CO3 is added drop by drop to one litre of a solution containing 10-4 mole of Ba2+ and 10-5 mole of Ag+. If Ksp for BaCO3 is 8.1×10-9 and Ksp for Ag2CO3 is 6.9×10-12, then which is not true?
Assume no hydrolysis of CO32- ion.

HARD
JEE Main/Advance
IMPORTANT
On mixing equal volumes of 0.1 M AgNO3 & 0.8 M KCN solutions, what percentage of original Ag+ is in the form of free Ag+ ions? Given: Kd of Ag(CN)2-=10-18. Report your answer after multiplying it by 4.5×1016. (Assume no hydrolysis of any ion)
EASY
JEE Main/Advance
IMPORTANT
For a sparingly soluble salt ApBq, the relationship of its solubility product Ls with its solubility (s) is:
MEDIUM
JEE Main/Advance
IMPORTANT
A solution which is 10- 3 M each in Mn2 + , Fe2 + , Zn2 + and Hg2 + is treated with 10- 16 M sulphide ion. If Ksp of MnS, FeS, ZnS and HgS are 10-15 , 10- 23 , 10- 20 and 10- 54 respectively, which one will precipitate first ?
HARD
JEE Main/Advance
IMPORTANT
The solubility product Ksp of salts of types MX, MX2 and M3X at a temperature T'' are 4.0×10-8,3.2×10-14 and 2.7×10-15 respectively. Solubilities mol dm-3 of salts at temperature 'T' are in the order:
MEDIUM
JEE Main/Advance
IMPORTANT
Which of the following is not a Lewis acid ?
MEDIUM
JEE Main/Advance
IMPORTANT
If the degree of ionization of water at a particular temperature was found to be 1.8×10-9, the Ka of water is