Tag: substances in common use

Questions Related to substances in common use

The reaction of $NaCl$ and $CaCO _3$ gives sodium carbonate. But this reaction cannot be used for the manufacture of washing soda since it is a reversible reaction.

chemistry substances in common use chemical from common salt compounds of carbon some useful compounds in everyday life

  1. True

  2. False

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Correct Option: A
Explanation:

The reaction of $NaCl$ and $CaCO _3$ gives sodium carbonate. But this reaction cannot be used for the manufacture of washing soda since it is a reversible reaction.

$2NaCl+CaCO _3\rightleftharpoons Na _2CO _3+CaCl _2$.

Hence the given statement is True.

Bleaching powder is soluble in cold water giving a milky solution due to:

chemistry substances in common use chemical from common salt compounds of carbon some useful compounds in everyday life

  1. available chlorine

  2. lime present in it

  3. calcium carbonate formation

  4. the absorption of carbon dioxide from atmosphere

Show answer
Correct Option: B
Explanation:

Bleaching powder on reaction with cold water form milky solution of calcium hydroxide. 

$CaOCl _2+H _2O\rightarrow Ca(OH) _2+Cl _2$

Thus because of the lime present in it, it gives a milky solution when dissolved in water.

Bleaching powder is obtained by the interaction of $Cl _2$ with a:

chemistry substances in common use chemical from common salt compounds of carbon some useful compounds in everyday life

  1. dilute solution of $Ca(OH) _2$

  2. concentrated solution of $Ca(OH) _2$

  3. dry $CaO$

  4. dry slaked lime

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Correct Option: D
Explanation:

$Ca(OH) _2 +Cl _2 \rightarrow Ca(OCl)Cl + H _2O$
Bleaching powder is obtained by the interaction of $Cl _2$ with a dry slaked lime.

Cobalt chloride acts as a calalyst, in the decomposition of bleaching powder.

chemistry substances in common use chemical from common salt compounds of carbon some useful compounds in everyday life

  1. True

  2. False

Show answer
Correct Option: A
Explanation:

$CoCl _2$ is used as catalyst in the decomposition of bleaching powder.

Bleaching powder slowly decomposes to form:

chemistry substances in common use chemical from common salt compounds of carbon some useful compounds in everyday life

  1. $CaCl _2+Ca(ClO _3) _2$

  2. $CaO+Cl _2$

  3. $CaCl _2+Ca(OCl) _2$

  4. $CaCO _3+Cl _2$

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Correct Option: D
Explanation:

When exposed to air, bleaching powder gives a smell of chlorine. This is because bleaching powder reacts with carbon dioxide from the atmosphere to produce calcium carbonate and chlorine.

$Ca(OCl) _2 +CO _2 \rightarrow CaCO _3 +Cl _2$

The average oxidation state of chlorine in bleaching power is :

chemistry substances in common use chemical from common salt compounds of carbon some useful compounds in everyday life

  1. -1

  2. +1

  3. zero

  4. -2 as well as +2

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Correct Option: C
Explanation:

In bleaching powder, $Ca(OCl)Cl$, the two $Cl$ atoms are in different oxidation states i.e., one $Cl^–$ having oxidation number of –1 and the other as $OCl^–$ having oxidation number of +1.


Hence, the average oxidation state of chlorine in bleaching powder is zero.

Which one of the following processes does not occur during formation of $CH{ Cl } _{ 3 }$ from ${ C H } _{ 3 }OH$ and bleaching powder ?

chemistry substances in common use chemical from common salt compounds of carbon some useful compounds in everyday life

  1. Hydrolysis

  2. Oxidation

  3. Reduction

  4. Chlorination

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Correct Option: C
Explanation:
The process that does not occur during the formation of $CHCl _3$ from $CH _3OH$ and Bleaching Powder is REDUCTION PROCESS.
In $CHCl _3$ oxidation state of carbon is +2 and in methanol oxidation state of carbon is-2. This is reduction.

Which of the following negative radical is present in bleaching powder?

chemistry substances in common use chemical from common salt compounds of carbon some useful compounds in everyday life

  1. Hypochlorite

  2. Chlorate

  3. Chloride

  4. Both $(A)$ and $(C)$

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Correct Option: D
Explanation:
Bleaching powder is calcium oxychloride given by the formula $CaOCl _2$ 

Hence, negative radicals are $OCl^-$ & $Cl^-$ i.e. hypochlorite & chloride.

Action bleaching poweder on ethyyl alcohol gives?

chemistry substances in common use chemical from common salt compounds of carbon some useful compounds in everyday life

  1. Chloroform

  2. Dichloro methane

  3. Trichloro ethane

  4. Ethylene chloride

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Correct Option: A
Explanation:

The reactions involved are-

$CaOCl _2 + H _2O \rightarrow Ca(OH) _2 + Cl _2$

$C _2H _5OH + [O] \rightarrow CH _3CHO$

$CH _3CHO + Cl _2 \rightarrow CCl _3HO$

$CCl _3CHO + Ca(OH) _2 \rightarrow CHCl _3 + (HCOO) _2Ca$


Hence the product formed is having Chloroform and the correct option is A.

Bleaching properties of bleaching powder are due it its:

chemistry substances in common use chemical from common salt compounds of carbon some useful compounds in everyday life

  1. Oxidizing properties

  2. Reducing properties

  3. Basic properties

  4. Disinfecting properties

Show answer
Correct Option: A
Explanation:

Chlorine bleaches by the process of oxidation. It needs moisture for its bleaching action.

Chlorine reacts with water to form hydrochloric and hypochlorous acids.

$Cl _2 + H _2O \rightarrow HCl + HClO$

Hypochlorous acid is unstable, and it easily dissociates to form nascent oxygen.

$HClO \rightarrow HCl + [O]$

Nascent oxygen is a more powerful oxidising agent. Its formation is responsible for the bleaching nature of chlorine in the presence of moisture.

Hence option A is correct answer.