MCQ
Which of the following reaction form $N_2O$
- ✓$N{H_4}N{O_3}\xrightarrow{\Delta }$
- B${NH_3}(exess) + C{l_2}\xrightarrow{\Delta }$
- C$N{H_4}N{O_2}\xrightarrow{\Delta }$
- D$FeS{O_4} + HN{O_3} \to $
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The products formed in the above reaction are

$(A)$ The $pH$ of $1 \times 10^{-8}\,M\,HCl$ solution is $8$.
$(B)$ The conjugate base $H _2 PO _4^{-}$is $HPO _4{ }^{2-}$.
$(C)$ $K _{ w }$ increases with increase in temperature.
$(D)$ When a solution of weak monoprotic acid is titrated against a strong base at half neutralisation point, $pH =\frac{1}{2} pK _{ a }$
Choose the correct answer from the option given below.