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

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

  1. Liberate $H _2$ gas
  2. Liberate $Cl _2$ gas
  3. Precipitate $Mg$

  4. No reaction will take place
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Metals that are more reactive than hydrogen, such as magnesium, react with hydrochloric acid to produce a metal chloride salt and hydrogen gas.

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

Which of the follwoing statements is correct?

  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
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

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

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

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

  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
Reveal answer Fill a bubble to check yourself
B Correct answer
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.
$NH _3 + HCl \rightarrow NH _4Cl$
Multiple choice chemistry p- block elements-ii hydrogen chloride chlorine - 17 group p-block elements

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

  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
Reveal answer Fill a bubble to check yourself
E Correct answer
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.

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

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

  1. Gastric juices of mammals

  2. Volcanic emissions
  3. Both $A$ and $B$

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
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.