Question

ed with AgBr. The addition of HBr 13 8 A solution is ill AgBrs)Ag(ag)+ Br(ag) (A) increase the ph (B) cause a decrease in Ag concentration. Ag' concentration (D) not cause a change in Ag' concentration 14 Changing the pH from 1.0 to 2.0 means [H (A) halves (B) doubles (C) increases by a factor of 10. (D) decreases by a factor of 10 9 10 Which salt will form a neutral aqueous solution? (B) Sr(C,H,0), (D) NH,CI (A) NaF (C) KBr 11 The pHi of an aqueous 0.00796 M solution of HIO, is 2.12. What is the K, of HIO,? Do not assume that ionization is negligible with respect to the initial concentration (A) 0.16 According to Lewis theory, a Lewis acid is ar) (B) 00076 (C) 0.00037 (D) 0.21 12 A proton donor. (B) electron-pair donor. (C) proton acceptor. (D) electron-pair acceptor

Answer 1

8)

Adding HBr is like adding Br- which is a product in given equilibrium process.

Adding product will shift the reaction in the direction of reactant as per Le chatelier Principle

So, Equilibrium moves to reactant side

This will decrease Ag+ concentration.

Since we are also adding H+ in HBr, pH would decrease

Answer: B

9)

use:

pH = -log [H+]

1 = -log [H+]

[H+] = 0.1 M

use:

pH = -log [H+]

2 = -log [H+]

[H+] = 0.01 M

We can see that [H+] has decreased by a factor of 10

Answer: D

10)

NaF is salt of Strong base (NaOH) and weak acid

Only base is strong

So, the salt NaF is basic

Sr(C2H3O)2 is salt of Strong base (Sr(OH)2) and weak acid

Only base is strong

So, the salt Sr(C2H3O)2 is basic

KBr is salt of Strong base (KOH) and Strong acid (HBr)

Both acid and base are strong

So, the salt KBr is neutral

NH4Cl is salt of weak base and Strong acid (HCl)

Only acid is strong

So, the salt NH4Cl is acidic

Answer: C

Only 1 question at a time please