MCQ
Which has minimum number of atoms of oxygen?
- A$10\, ml\, H_2O(l)$
- B$0.1\, mol$ of $V_2O_5(s)$
- C$12\, gm\, O_3(g)$
- ✓$12.04\times10^{22}$ molecules of $CO_2$
${=12.04 \times 10^{22} \times 2} $
${=24.08 \times 10^{22} \text { atoms of oxygen }}$
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$(A)$ 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.
