The concentration of $\left[{\mathrm{H}}^{+}\right]$ ion in a solution containing 0.1 M HCN and 0.2 M NaCN will be:

(${\mathrm{K}}_{\mathrm{a}}$ for HCN = $6.2×{10}^{-10}$)

1. 3.1$×{10}^{10}$

2. $6.2×{10}^{5}$

3. $6.2×{10}^{-10}$

4. $3.1×{10}^{-10}$

Subtopic:  Buffer |
67%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

In a buffer solution containing an equal concentration of B- and HB, the Kb for B- is 10-10. pH of the buffer solution is:

 1 10 2 7 3 6 4 4
Subtopic:  Buffer |
69%
From NCERT
AIPMT - 2010
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

Which composition will make the basic buffer?

 1 100 mL of 0.1 M HCl+100 mL of 0.1 M NaOH 2 50 mL of 0.1 M NaOH+25 mL of 0.1 M CH3COOH 3 100 mL of 0.1 M CH3COOH+100 mL of 0.1 M NaOH 4 100 mL of 0.1 M HCl+200 mL of 0.1 M NH4OH
Subtopic:  Buffer |
62%
From NCERT
NEET - 2019
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch