The best indicator for detection of end point in titration of a weak acid and strong base is

1. methyl red (5 to 6)

2. methyl orange (3 to 4)

3. phenolphthalein (8 to 9.6)

4. bromothymol blue (6 to 7.5)

The compound that is not a Lewis acid is-

1.  CCl₄ 

2. BeCl₂ 

3. BF₃

4. AlCl₃

The conjugate acid of ${\mathrm{NH}}_2^{-}$ is

1. ${\mathrm{NH}}_4^{+}$

2. ${\mathrm{NH}}_3$

3. ${\mathrm{NH}}_2\mathrm{OH}$

4. ${\mathrm{N}}_2{\mathrm{H}}_4$

The pH of the neutralization point of 0.1 N ammonium hydroxide with 0.1 N HCl is

1. 1

2. 6

3. 9

4. 7

The compound whose 0.1 M solution is basic is

1. Ammonium acetate

2. Ammonium sulphate

3. Sodium acetate

4. Ammonium chloride

Fear or excitement, generally causes one to breathe rapidly and it results in the decrease of CO₂ concentration in blood. In what way will it change the pH of blood?

1. pH will increase

2. pH will decrease

3. no change

4. pH will adjust to 7

A buffer solution can be prepared from a mixture of:

I. Sodium acetate and acetic acid in water

II. Sodium acetate and hydrochloric acid in water

III. Ammonia and ammonium chloride in water

IV. Ammonia and sodium hydroxide in water.

1. I, III, IV

2. III, IV

3. I, II, IV

4. I,  III

The basic buffer solution among the following is: 

1. ${\mathrm{NH}}_4\mathrm{Cl}+{\mathrm{NH}}_4\mathrm{OH}$

2. $\mathrm{NaCl}+\mathrm{NaOH}$

3. ${\mathrm{NH}}_4\mathrm{Cl}+{\mathrm{CH}}_3\mathrm{COOH}$

4. ${\mathrm{CH}}_3\mathrm{COONa}+{\mathrm{CH}}_3\mathrm{COOH}$

Conjugate base of hydrazoic acid is: 

1. ${\mathrm{HN}}_3^{-}$

2. ${\mathrm{N}}_2^{-}$

3. Azide ion

4. Nitride ion

Which of the following are Lewis acids?

(i) ${\mathrm{BF}}_3$

(ii) ${\mathrm{H}}_2\mathrm{O}$

(iii) ${\mathrm{HSO}}_4^{-}$

(iv) ${\mathrm{SO}}_3$

1. (i) and (iii)

2. (i) and (ii)

3. (i) and (iv)

4. (iii) and (iv)