Important Properties of Compounds of Zinc

Zinc chloride on reaction with excess of $\mathrm{NaOH}$ gives a salt $\left(\mathrm{A}\right)$ and $\left(\mathrm{A}\right)$ on reaction with a gas $\left(\mathrm{Y}\right)$ gives white precipitate $\left(\mathrm{W}\right)$. Which of the following is correct?

If the number of reactions produces white residue (colour is observed after cooling) $=\mathrm{x}.$ Find the value of $1.2\mathrm{x}$.

(a) $\mathrm{ZnS}+{\mathrm{O}}_2\stackrel{\mathrm{\Delta }}{⟶}$
(b) ${\mathrm{ZnCO}}_3·3\mathrm{Zn}(\mathrm{OH}{)}_2\stackrel{\mathrm{\Delta }}{⟶}$
(c) $\mathrm{Zn}{\left({\mathrm{NO}}_3\right)}_2+\mathrm{Co}{\left({\mathrm{NO}}_3\right)}_2\stackrel{\mathrm{\Delta }}{⟶}$
(d) ${\mathrm{ZnCl}}_2·2{\mathrm{H}}_2\mathrm{O}\stackrel{\mathrm{\Delta }}{⟶}$
(e) $\mathrm{Zn}(\mathrm{OH}{)}_2\stackrel{\mathrm{\Delta }}{⟶}$

Cotyledons are also called-

When the same amount of zinc is treated separately with excess of sulphuric acid and excess of sodium hydroxide, the ratio of volumes of hydrogen evolved is -

Which of the following is deliquescent?

Which of the following is called white vitriol?

Philosopher's wool on heating with $\mathrm{BaO}$ at $1100°\mathrm{C}$ produces

Which of the following is philosopher's wool?

The product obtained by heating zinc blende in air is produces [A], [A] is dissolved in dil. H₂SO₄ produces [B]. A mixture of [B] and BaS is used as white pigment. Choose the incorrect statement among following statements.

Zinc on reaction with $\mathrm{NaOH}$ gives a salt $\left(\mathrm{A}\right)$ along with a gas $\left(\mathrm{X}\right)$ and $\left(\mathrm{A}\right)$ on reaction with a gas $\left(\mathrm{Y}\right)$ gives white precipitate $\left(\mathrm{W}\right)$. Which of the following is correct?

The oxide which is used as white pigment :

The compound which reacts with both $\text{HCl}$ and $\text{NaOH}$ is

When some amount of zinc is treated separately with excess of sulphuric acid and excess of sodium hydroxide solution, the ratio of volumes of hydrogen evolved is

Which of the following dissolves in a hot concentrated solution of $\mathrm{NaOH}$?

The compound which gives off oxygen on moderate heating is

When the same amount of zinc is treated separately with an excess of sulphuric acid and an excess of sodium hydroxide, the ratio of volumes of hydrogen evolved is