The average value of heat of neutralisation of dilute solution of strong acids and strong bases is about __________ kcal/kg.mole of water formed.

Mineral acids are stronger acids than carboxylic acids because (i) Mineral acids are completely ionised. (ii) Carboxylic acids are completely ionised. (iii) Mineral acids are partially ionised. (iv) Carboxylic acids are partially ionised.

A

(i) and (iv)

B

(ii) and (iii)

C

(i) and (ii)

D

(iii) and (iv)

A 60% spirit solution is mixed with r% spirit solution in the ratio 1 : 3 such that a s% spirit solution is obtained. When a (s/3)% spirit solution is mixed with 55% spirit solution in equal ratio, an (r/2)% spirit solution is obtained. Which of the following can be determined? (A) Value of ‘r’ (B) Value of ‘s’ (C) Volume of the 60% spirit solution mixed initially (D) If 9 liters of r% spirit solution was mixed initially, what was the volume of the s% spirit solution thus obtained?

A

Only C and D

B

Only A and B

C

Only A, C and D

D

Only A, B and D

E

Only A, B and C

A chemical solution appears green when the salt concentration is 8 grams per litre (gpl) and red when it is 10 gpl. Pure water was added to the solution of 1 litre of 15 gpl solution till it turned green. Then 125 ml of the green solution is taken out and x grams of salt is added to the green solution to make it red. Another 500 ml of the final solution was taken out and y litres of green solution is added to get a resultant solution of concentration 9.6 gpl. Assume adding salt doesn’t change its volume and find the ratio of x and y.

A

1

B

1.25

C

1.5

D

2

E

1.75

Which of the following statements about acids are correct? (i) All compounds containing hydrogen are acidic. (ii) Acids generate H+ ions in aqueous solution. (iii) Aqueous solution of acids change the colour of turmeric into red. (iv) Aqueous solution of acids conduct electricity.

A

(ii), (iii) and (iv)

B

(ii) and (iv)

C

(ii) and (iii)

D

(i), (ii) and (iv)

Reaction between which of the following will NOT lead to the evolution of Hydrogen gas? (A) Magnesium with dilute hydrochloric acid (B) Copper with dilute hydrochloric acid (C) Sulphur powder with dilute hydrochloric acid (D) Aluminium with dilute hydrochloric acid

A

A and C

B

B and C

C

A and B

D

A and D

A student puts a punch of turmeric in solutions marked A and B. She writes the following statements in her copy S1 - Solution A turns red and there is no change in solution B S2 - Solution A is base and solution B is an acid. S3 - turmeric can be used to differentiate between acids, bases and salts. Which of the following statements is correct?

A

S1 and S2 are observations; S3 is inference

B

S1 is observation; S2 is inference

C

S1 is observation; S2, S3 are inference

D

S2 is observation; S3 is inference

A dilute solution of sodium carbonate was added to two test tubes one containing dilute HCI (A) and the other containing dilute NaOH (B). the correct observation was:

A

A brown colored gas liberated in test tube A

B

A brown colored gas liberated in test tube B

C

A colorless gas liberated in test tube A

D

A colorless gas liberated in test tube B

It is desired to concentrate a 20% salt solution (20 kg of salt in 100 kg of solution) to a 30% salt solution in an evaporator. Consider a feed of 300 kg/min at 30°C. The boiling point of the solution is 110°C, the latent heat of vaporisation is 2100 kJ/kg and the specific heat of the solution is 4 kJ/(kgK). The rate at which the heat has to be supplied in (kJ/min) to the evaporator is

A

3.06 × 10⁵

B

6.12 × 10⁵

C

7.24 × 10⁵

D

9.08 × 10⁵

Identify the incorrect statement. a. Acids are sour in taste whereas bases are bitter in taste and soapy to touch. b. Acids turn blue litmus red and bases turn red litmus blue. c. Solutions of substances tat show different colours in acidic, basic and neutral solutions are called indicators. d. An acid and a base neutralise each other to form a salt and a salt is always neutral.

A

a, d

B

c

C

b, c

D

d

Consider the following statements.
1. During the pressure of osmosis, the solvent travels from the concentrated solution to the dilute solution.
2. In the reverse osmosis, external pressure is applied to the dilute solution.
Which of the statement(s) given above is/are correct?

A

Only 1

B

Only 2

C

Both 1 and 2

D

Neither 1 nor 2

The average value of heat of neutralisation of dilute solution of strong acids and strong bases is about __________ kcal/kg.mole of water formed.

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