Question

The table below shows the results of different experiment conducted on two acids X and Y of equal concentration:


X

Y

Conductivity of solution

400 S m -1

7.0 S m -1

Temperature change when excess acid reacted with 100 mL of 1M NaOH solution


6.9oc

6.7oc

Reaction with Mg

Hydrogen gas is produced rapidly with rapid effervescence

Hydrogen gas is produced slowly with gradual effervescence


Which of the following statement is correct?

X is stronger acid because it has higher conductivity.

Y is stronger acid because hydrogen is produced slowly when reacts with Mg.

X is weaker acid because temperature change is higher when reacts with NaOH.

Y is weaker acid because it has higher conductivity.

Select the correct relation from the following”

(H+)X < (H+)Y        (b) (H+)X = (H+)Y        (c) (pH)X < (pH)Y        (d) (pH)Y > 7

What will be colour of universal indicator in “X”?

Blue         (b) Orange        (c) Green         (d) Red

How many moles of H2 gas will be liberated by ‘X’ and ‘Y’ during reaction with 1 mole of Mg?

1/2         (b) 1/4        (c) 2         (d) 1

The gas formed when X and Y reacts with a metal carbonate is :

Hydrogen    (b) Hydrogen sulphide    (c) Oxygen    (d) Carbon dioxide

​

Answer 1

1) green

2) 1/4

3) hydrogen sulphide

Answer 2

Q) Which of the following statement is correct?

Ans: (a) X is stronger acid because it has higher conductivity.

Q) Select the correct relation from the following

Ans: (c) (ph) X < (pH) Y i.e., the pH of strong acids is lower than that of Weak acids.

Q) What will be the color of the universal indicator in “X”?

Ans: (d) Red; because strong acids turn universal indicator to Red color.

Q) How many moles of H2 gas will be liberated by ‘X’ and ‘Y’ during reaction with 1 mole of Mg?

Ans: (b) 1/4

Q) The gas formed when X and Y react with a metal carbonate is:

Ans: (d) Carbon dioxide; because acids react with metal carbonate/metal hydrogen carbonate to liberate CO2 gas.

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