Question

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Answer 1

Answer: (4) HCl < NH4Cl < NaCl < NaCN.

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Answer 2

$\huge\color{red}{ \underline {\underline{Answer:}}}$

4th option is the correct answer

$\huge \color{violet}{ \underline {\underline{Explanation:}}}$

Because They asked for increasing order of pH(power of hydrogen) value.

According to the options HCl is less than NH4CL is less than NaCl is less than NaCN.

Therefore, NaCN has higher pH value in that option.

$\huge\color{pink}{ \underline {\underline{Extra \:knowledge:}}}$

A compound which have lesser pH value is more acidic and which have higher pH value is more basic.