Out of the following metals which will give $H_2$ reaction with $NaOH$?
$I:Zn$
$II:Mg$
$III:Al$
$IV:Be$

Q.

Arrange the following compounds in the increasing order of their densities.

(a) (i) < (ii) < (iii) <(iv) (b) (i) < (iii) < (iv) < (ii)

(c) (iv) <(iii) <(ii) < (i) (d) (ii) < (iv) < (iii) < (i)

Q. Which of the following are physical changes ?
(i) melting of iron metal
(ii) rusting of iron metal
(iii) bending of an iron rod
(iv) drawing a wire of iron metal

(a) (i), (ii) and (iii)
(b) (i), (ii) and (iv)
(c) (i), (iii) and (iv)
(d) (ii), (iii) and (iv)

Q. Out of the following metals, which will give $H_2$ on reaction with $NaOH$?
$I:Zn$
$II:Mg$
$III:Al$
$IV:Be$

Q. Which of the following metals will give $H_2$ on reaction with aqueous $NaOH$:
$I:Zn$ $II:Mg$
$III:Al$ $IV:Be$

Q.

The order of -I power (-ve inductive effect ) of the following functional groups will be:

(i) $-S{O}_{3}H$

(ii) $-Cl$

(iii) $-N{H}_2$

(iv) $-H$