Question

Assertion: The value of $K_w$ increases with increase in temperature.

Reason: Water dissociates more as temperature increases.

• A. Both Assertion and Reason are true and Reason is the correct explanation of Assertion
• B. Both Assertion and Reason are true but Reason is not the correct explanation of Assertion
• C. Assertion is true but Reason is false
• D. Assertion is false but Reason is true
• E. Both Assertion and Reason are false
  

Answer 1

The correct option is A Both Assertion and Reason are true and Reason is the correct explanation of Assertion

$K_w=\left[H^{+}\right]\left[O{H}^{-}\right]$
As the temperature increases, the dissociation of water increases.
Hence, the hydrogen ion concentration and hydroxide ion concentration increases.
Hence, the value of Kw increases with increase in temperature.