MCQ
Which of the following is wrong statement
- ✓$Ni{(CO)_4}$ has oxidation number $+ 4 $ for $Ni$
- B$Ni{(CO)_4}$ has zero oxidation number for $ Ni$
- C$ Ni$ is metal
- D$CO$ is gas
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$A$. $\mathrm{Fe}$ $B$. $\mathrm{Mn}$ $C$. $\mathrm{Ni}$ $D$. $\mathrm{Cr}$ $E$. $\mathrm{Cd}$
Choose the correct answer from the options given below:
Assertion $A$ :Phenolphthalein is a $pH$ dependent indicator, remains colourless in acidic solution and gives pink colour in basic medium
Reason $R$ : Phenolphthalein is a weak acid. It doesn't dissociate in basic medium.
In the light of the above statements, choose the most appropriate answer from the options given below.
