Which of the following is deliquescent?

Z n C l_{2}

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H g_{2} C l_{2}

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H g C l_{2}

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C d C l_{2}

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Solution

The correct option is D $Z n C l_{2}$
$(A)$ $Z n C l_{2}$

$R e a s o n$ : Zinc chloride is a chemical compound with the formula $Z n C l_{2}$ and its hydrates.All zinc chlorides are colourless or white and highly soluble in water.Zinc chloride or $Z n C l_{2}$ is a $d e l i q u e s c e n t$ salt and forms acidic solutions in polar organic solvents,such as water, ether and acetone etc.
As we know, $d e l i q u e s c e n t$ substances are the water soluble substances which absorbs moisture from the air and then dissolve in the absorbed moisture to change into liquid state and this phenomenon is called $d e l i q u e s c e n c e$ . $Z n C l_{2}$ is one of the example of $d e l i q u e s c e n t$ substance.

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a) Hg2Cl2

b) HgCl2

c) ZnCl2

d) CdCl2

Q. Assertion :Increasing order of covalent character among given compounds is

H g {C l}_{2} < C d {C l}_{2} < Z n {C l}_{2}

. Reason: Order of size of cations is

{Z n}^{2 +} < {C d}^{2 +} < {H g}^{2 +}

Which of the following metal chloride gives white ppt and black ppt respectively with aequeous solution of gas (B)

A metal gives two chlorides ‘A’ and ‘B’. ‘A’ gives black precipitate with $N H_{4} O H$ and ‘B’ gives white precipitate .With KI ,‘B’ gives a red precipitate soluble in excess of KI. ‘A’ and ‘B’ are respectively :

Q. The chemical reaction between

K_{2} C_{2} O_{4}

and

H g C l_{2}

is:

2 H g C l_{2} + K_{2} C_{2} O_{4} \to 2 K C l + 2 C O_{2} + H g_{2} C l_{2}

.
The masses of

H g_{2} C l_{2}

are precipitated from different solutions in given time are as follows:

Time	$H g C l_{2}$ (mol $l i t r e^{1})$	$K_{2} C_{2} O_{4}$ (mol $l i t r e^{1})$	$H g_{2} C l_{2}$ formed (mol $l i t r e^{1})$
60	0.0418	0.404	0.0032
65	0.0836	0.404	0.0068
120	0.0836	0.202	0.0031

What is the overall order of the reaction?