Tag: chemistry

Questions Related to chemistry

What if hydrochloric acid comes in contact with a metal such as magnesium?

chemistry p- block elements-ii hydrogen chloride chlorine - 17 group p-block elements

  1. Liberate $H _2$ gas

  2. Liberate $Cl _2$ gas

  3. Precipitate $Mg$

  4. No reaction will take place

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Correct Option: A

Which of the follwoing statements is correct?

chemistry p- block elements-ii hydrogen chloride chlorine - 17 group p-block elements

  1. HCl is covalent both in aqueous solution and in the gaseous state

  2. HCl is covalent in the gaseous state but ionic in aqueous solution

  3. HCl is ionic both in the gaseous state and in aqueous solution

  4. None of the above

Show answer
Correct Option: B
Explanation:

HCl is covalent in the gaseous state but dissociates into ions in aqueous solution. It behaves like acid when aqueous.

Which one of the following substances is formed by the reaction of potassium permanganate on concentrated by hydrochloric acid?

chemistry p- block elements-ii hydrogen chloride chlorine - 17 group p-block elements

  1. ${H} _{2}O _2$

  2. $HOCl$

  3. ${H} _{2}$

  4. ${Cl} _{2}$

Show answer
Correct Option: D
Explanation:
$2KMnO _4+16HCl \rightarrow 2KCl+2MnCl _2+8H _2O+5Cl _2$

A glass rod dipped in ammonia solution is brought near the mouth of the $HCl$ gas, then:

chemistry p- block elements-ii hydrogen chloride chlorine - 17 group p-block elements

  1. deep red flame of ammonium chloride appears

  2. dense white fumes of ammonium chloride appears

  3. no reaction occurs

  4. none of the above

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Correct Option: B
Explanation:
When a glass rod dipped in the ammonia solution is brought near HCl gas, a dense white fume of ammonium chloride is formed.
This is because ammonia reacts with the fumes of $HCl$ to give ammonium chloride.
$NH _3 + HCl \rightarrow NH _4Cl$

A solution of hydrogen chloride gas was named as :

chemistry p- block elements-ii hydrogen chloride chlorine - 17 group p-block elements

  1. blue vitriol

  2. green vitriol

  3. muriatic acid

  4. none of the above

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Correct Option: C
Explanation:
HCl was named initially as muriatic acid or spirits of salt because it was produced from rock salt and green vitriol.

$HCl$ occurs in:

chemistry p- block elements-ii hydrogen chloride chlorine - 17 group p-block elements

  1. free state

  2. combined state

  3. Both A and B

  4. None of the above

Show answer
Correct Option: A
Explanation:

In the free state HCl gas is found in the trace amount in volcanic regions.

HCl is secreted as gastric juices in the stomach during digestion of food. 

A piece of zinc may be distinguished from a piece of magnesium by: 
(1) determining which conducts electricity
(2) determining which releases $H _2$ gas from a 1-molar hydrochloric acid solution
(3) measuring the density of each

chemistry p- block elements-ii hydrogen chloride chlorine - 17 group p-block elements

  1. If 1, 2 and 3 are correct

  2. If only 1 and 2 are correct

  3. If only 2 and 3 are correct

  4. If only 1 is correct

  5. If only 3 is correct

Show answer
Correct Option: E
Explanation:

Both zinc and magnesium conduct electricity. Both zinc and magnesium reacts with hydrochloric acid to give hydrogen gas. They can be distinguished by measuring their densities.

Which of the following are the sources of hydrochloric acid?

chemistry p- block elements-ii hydrogen chloride chlorine - 17 group p-block elements

  1. Volcanic gases

  2. Blood of mammals

  3. Hairs of human beings

  4. Citrus juices

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Correct Option: A
Explanation:

$HCl$ is available in free state in volcanic gases and it is also available in gastric juices of mammals and helps in digestion process of mammals.

Which of the following name is given to the hydrochloric acid by Lavoiser?

chemistry p- block elements-ii hydrogen chloride chlorine - 17 group p-block elements

  1. Mutaric acid

  2. Glutaric acid

  3. Tartaric acid

  4. King of acids

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Correct Option: A
Explanation:

Mutaric acid is the name given to the hydrochloric acid by Lavoisier

$HCl$ is present in which of the following things?

chemistry p- block elements-ii hydrogen chloride chlorine - 17 group p-block elements

  1. Gastric juices of mammals

  2. Volcanic emissions

  3. Both $A$ and $B$

  4. None of the above

Show answer
Correct Option: C
Explanation:

$HCl$ is present in free state in volcanic emissions and it is also available in gastric juices of mammals and helps in digestion process.
Hence option C is correct.