Question

Assertion: Methyl red has $K_a={10}^{-5}$ and the acid form, $HIn$ is red and its conjugate base $In{d}^{⊝}$ is yellow.
Reason: $pH=357$
$\frac{\left[In{d}^{⊝}\right]}{\left[HIn\right]}={10}^{-2}1{10}^2$
Colour $=$ Red orange Yellow

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
• C. Assertion is correct but Reason is incorrect
• D. Assertion is incorrect but Reason is correct
• E. Both Assertion and Reason are incorrect

Answer 1

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

Assertion: Methyl red has $K_a={10}^{-5}$ and the acid form, HIn is red and its conjugate base $In{d}^{⊝}$ is yellow.
Reason: $pH=357$
$\frac{\left[In{d}^{⊝}\right]}{\left[HIn\right]}={10}^{-2}1{10}^2$
Colour $=$ Red orange Yellow
$pH=pKa+log\left[In{d}^{⊝}\right]\left[HIn\right]$
Thus, both Assertion and Reason are correct and Reason is the correct explanation for Assertion