pKa increases in benzoic acid when substituent "x" is bonded at para-position, then "x" is
-COOH
-NO2
-CN
-OCH3
What will be the solubility product of AX3?
27S4
4S3
36S4
9S3
A.
27S4
AX3
Ksp = [A3+] [X-]3
= (S).(3S)3 = 27S4
Assertion : Aqueous solution of CoCl2 is pink in colour. It turns blue in presence of conc. HCl.
Reason : It is due to the formation of [CoCl4]2-.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
The concentration of Ag+ ion in a given saturated solution of AgCl at 25°C is 1.06 x 10-5 g ion L-1 .Thus , the solubility product of AgCl is :
0.453 x 10-10
0.530 x 10-10
1.12 x 10-10
2.12 x 10-10
Solution of 0.l N NH4OH and 0.1 N NH4Cl has pH 9.25. Then , pKb of NH4OH is :
9.75
4.75
3.75
8.25