Tag: hydrogen chloride

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

 $\displaystyle { HCl(g) }$ and $\displaystyle { HCl (aq) }$ have different behaviour towards litmus.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

$HCl$ can produce ions only in aqueous solution making aqueous $HCl$acidic. So, aqueous $HCl$ turns blue litmus red whereas dry $HCl$ does not dissociate and acts inert to litmus.

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

Aqua-regia dissolves gold. 
which is correct?

  1. Aqua regia, or nitro-hydrochloric acid is a highly corrosive mixture of acids , a fuming yellow or red solution.

  2. The mixtures is formed by freshly mixing concentrated nitric acid and hydrochloric acid hoptimally in a volume ratio of 1:3.

  3. it can dissolve the noble metalsgold and platinum

  4. all of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Aqua regia, or nitro-hydrochloric acid is a highly corrosive mixture of acids, a fuming yellow or red solution. The mixtures is formed by freshly mixing concentrated nitric acid and hydrochloric acid hoptimally in a volume ratio of 1:3. It was named so because it can dissolve the noble metalsgold and platinum
Hence answer 1 is correct.

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

What is the pH number of hydrochloric acid?

  1. Below 7

  2. Above 7

  3. 7

  4. Between 8 and 10
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The pH of acids is given by the pH scale from 1-7. Strength of acids increases by moving down the scale from 7 to 1. High acidity ranks as 1 on the pH scale and 7 are neutral. HCl is highly acidic so it has pH less than 7 while on this scale basicity increases going from 7 to 14. So all the acids have pH under 7.


Option A is correct.

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.