Dry slaked lime on reaction with chlorine givesPure anhydrous Calcium chlorideBleaching powderA combination of - dibasic Calcium hypochlorite - -and dibasic Calcium Chloride - -Both -A- and -C-

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Salts and pH of Salts

Dry slaked li...

Question

Dry slaked lime on reaction with chlorine gives

Pure anhydrous Calcium chloride

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Bleaching powder

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A combination of

, dibasic Calcium hypochlorite -

and dibasic Calcium Chloride -

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Both (A) and (C)

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Solution

The correct options are
B Bleaching powder
C A combination of , dibasic Calcium hypochlorite - and dibasic Calcium Chloride - .
$2 C a (O H)_{2} + 2 C l_{2} \to C a (O C l)_{2} + C a C l_{2} + 2 H_{2} O$
Dry slaked lime on reaction with chlorine gives Calcium oxychloride also called Bleaching Powder. Do note that $C a (O C l)_{2}$ is also called Calcium Hypochlorite.

$N a O C l$ - Sodium hypochlorite, is called liquid bleach. In general, bleaching powder is more stable than $N a O C l$ and also has more available Chlorine. Do note that the term "bleaching powder" is a blanket term. It is not just a simple combination of Calcium hypochlorite $C a (O C l)_{2}$ , Calcium chloride $C a C l_{2}$ and Calcium Hydroxide $C a (O H)_{2}$ . Instead, it consists of $C a (O C l)_{2}$ mainly, dibasic Calcium hypochlorite, $C a_{3} (O C l)_{2} (O H)_{4}$ and dibasic Calcium Chloride, $C a_{3} C l_{2} (O H)_{4}$ .

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Similar questions

Q. Bleaching powder is a mixed salt of hydrochloric acid and hypochlorous acid. It has the formula,
CaOCl2.H2O. It is manufactured by the action of chlorine on dry slaked lime at 40oC. There is also a view
that bleaching powder is a mixture of calcium hypochlorite and basic calcium chloride
[Ca(OCl)2+CaCl2Ca(OH)2.H2O].
The amount of chlorine obtained from a sample of bleaching powder by the treatment with excess of
dilute acids or CO2 is called available chlorine. A good sample of bleaching powder contains 35-38% of
available chlorine. On long standing , it undergoes auto-oxidation and the amount of available chlorine
decreases.
The estimation of available chlorine is done volumetrically by (a) iodometric method or by (b) arsenite
method.
In textile industry, the cotton cloth is mainly bleached with the help of bleaching powder.
12. Maximum percentage of available chlorine on the basis of CaOCl2.H2O formula is:
(A) 35 (B) 40
(C) 45 (D) 49
13. The percentage of available chlorine in commercial samples of bleaching powder is usually
between 33- 38%. The low value is due to:
(A) incomplete reaction between slaked lime and Cl2 during its formation
(B) impurities present in the original slaked lime
(C) decomposition of bleaching powder when kept in air
(D) all of the above
14. 3.55g of bleaching powder when treated with acetic acid and excess of Kl liberated iodine which
required 60mL of 0.5N sodium thiosulphate solution. The percentage of available chlorine in the
sample is:
(A) 30.0 (B) 25.0
(C) 20.0 (D) 35.0
15. On long standing, the bleaching powder undergoes auto-oxidation. The products formed are:
(A) calcium chloride only (B) calcium chlorate only
(C) calcium chloride and calcium chlorate (D) calcium chloride and calcium chlorite
16. The chemical name of bleaching powder is:
((A) calcium hypochlorite (B) calcium chlorohypochlorite
(C) calcium chlorate (D) calcium perchlorate

The common names of $C a O$ and $C a (O H)_{2}$ respectively are

what happens when; write chemical equations of the reaction involved:

A) chlorine reacts with slaked lime .

B) calcium nitrate is heated.

The common names of Cao and $C a (O H)_{2}$ respectively are ___ and ___.

Q. Calcium reacts vigorously with water to produce slaked lime.

Identify the correct classification:
I. Combination reaction
II. Endothermic reaction
III. Exothermic reaction

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