Question

State Arrhenius concept of acids and bases. Select a strong acid and a weak base from amongst the following substances : (2 Mark)
H2CO3 , HNO3 , NaOH , NH4OH .​

Answer 1

Explanation:

1.

Which one of the following is a weak acid?

(a) HNO3

(b) HI

(c) HBr

(d) HF

(e) HClO3

2.

Which salt is not derived from a strong acid and a strong soluble base?

(a) MgCl2

(b) Ba(NO3)2

(c) LiClO4

(d) CsBr

(e) NaI

3.

Which one of the following is a strong electrolyte?

(a) H2O

(b) KF

(c) HF

(d) HNO2

(e) (CH3)3N

4.

In a sample of pure water, only one of the following statements is always true at all conditions of temperature and pressure. Which one is always true?

(a) [H3O+] = 1.0 x 10-7 M

(b) [OH-] = 1.0 x 10-7 M

(c) pH = 7.0

(d) pOH = 7.0

(e) [H3O+] = [OH-]

5.

If Kw is 2.9 x 10-15 at 10oC, what is the pH of pure water at 10oC?

(a) 6.72

(b) 7.00

(c) 7.27

(d) 7.53

(e) none of these