MCQ
Transition metals are often para magnetic owing to $.......$
- AHigh melting point and boiling point.
- BThe presence of vacant orbitals.
- ✓The presence of unpaired electrons.
- DMalleability and ductility.
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|
List $I$ (Anion) |
List $II$ $($Gas evolved on reaction with dil $H _{2} SO _{4})$ |
| $A.$ $CO _{3}^{2-}$ | $I.$ Colourless gas which turns lead acetate paper black |
| $B.$ $S^{2-}$ | $II.$ Colourless gas which turns acidified potassium dichromate solution green. |
| $C.$ $SO_{3}{ }^{2-}$ | $III.$ Brown fumes which turns acidified KI solution containing starch blue. |
| $D.$ $NO _{2}^{-}$ | $IV.$ Colourless gas evolved with brisk effervescence, which turns lime water milky. |
Choose the correct answer from the options given below
Item$-I$ Item$-II$
$(I)$ Benzene $( P )$ $HCl$ and $SnCl _{2}, H _{3} O ^{+}$
$(II)$ Benzonitrile $(Q)$ $H _{2}, Pd - BaSO _{4}, S$ and quinoline
$(III)$ Benzoyl Chloride $(R)$ $CO , HCl$ and $AlCl _{3}$