Tag: hydrogen chloride

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

When three parts of conc. HCl and one part of conc. $HNO _{3}$ is mixed, a compound 'X' is formed. The correct option related to 'X' is:

  1. 'X' is known as aqua-regia

  2. 'X' is used for dissolving gold

  3. 'X' is used for decomposition of salts of weaker acids

  4. both (a) and (b)
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Aqua regia is also called as royal water is a mixture of nitric acid and hydrochloric acid in the  molar ratio of 1:3. Aqua regia is a yellow-orange fuming liquid.Aqua regia is used for the decomposition of weak acids.

Hene option D is correct.

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

A and B are two gases. A is identified with the glass rod dipped in $NH _3$ and $\mathrm{B}$ is identified with the glass rod dipped in $HCl$. Then A and B are :

  1. $\mathrm{H}\mathrm{Cl},\ \mathrm{N}\mathrm{O} _{2}$
  2. $\mathrm{H}\mathrm{Cl},\ \mathrm{N}\mathrm{H} _{3}$
  3. $\mathrm{N}\mathrm{H} _{3}$, H$\mathrm{Cl}$
  4. $\mathrm{N}\mathrm{H} _{3},\ \mathrm{S}\mathrm{O} _{2}$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

When glass rod dipped in $NH _3$, it is $HCl$ which reacts to form $NH _4Cl$ and when dipped in $HCl$, it is $NH _3$ which react to form $NH _4Cl$. 

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

Statement I: $HCl$ is considered to be an acid.

Statement II: $HCl$ is a proton donor.

  1. <p>Both Statement 1 and Statement 2 are correct and Statement 2 is the correct explanation of Statement 1.</p>

  2. <p>Both Statement 1 and Statement 2 are correct and Statement 2 is not the correct explanation of Statement 1.</p>

  3. <p>Statement 1 is correct but Statement 2 is not correct.</p>

  4. <p>Statement 1 is not correct but Statement 2 is correct.</p>

  5. <p>Both the Statement 1 and Statement 2 are not correct. </p>
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

An acid is a substance that can donate a hydrogen ion ($H^+$) or proton to another substance. $HCl$ can donate proton so it is a acid.

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

The reaction of zinc metal and $HCl$ produces which of the following?
i. $H _2(g)$
ii. $Cl _2(g)$
iii. $ZnCl _2(aq)$

  1. ii only

  2. iii only

  3. i and ii only

  4. i and iii only

  5. i, ii and iii
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Zn being an active metal it readily reacts HCl at room temperature.

$Zn+HCl\rightarrow ZnCl _{ 2 }+{ H } _{ 2 }$
It is a diplacement reation. 
Zinc displaces hydrogen from $HCl$.

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

Which of the following acids is capable of dissolving gold?

  1. Hydrochloric acid

  2. Nitric acid

  3. Sulfuric acid

  4. A combination of A and B

  5. A combination of A and C
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Aqua regia is a mixture of hydrochloric acid and nitric acid in the ration $3:1$. It is a very strong acid and can dissolve any metals including noble metals like gold and silver.

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

$HCl$ gas can fume in moist air.

  1. True

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

Concentrated hydrochloric acid or fuming HCl acid forms acidic mists. Both the mist and the solution have a corrosive effect on human tissue like eyes, skin, intestines etc. This moisture can be prevented during the preparation of HCl by using a guard tube with calcium chloride in it.

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

There are two colourless solutions (A) and (B), both give white ppt with $AgNO _3$ which dissolves in $aq \, NH _3$. Also (A) on reaction with $H _2O$ gives orange turbidity while (B) gives white turbidity. Identify (A) and (B). 

  1. (A) $SbCI _3 ;\, \, \,$ (B) $BiCI _3$
  2. (A) $BiCI _3 ;\, \, \,$ (B) $SbCI _3$
  3. (A) $SeCI _3; \, \, \,$ (B) $BiCI _3$
  4. (A) $BiCI _3; \, \, \,$ (B) $SeCI _3$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

$SbCI _3$ or $BiCI _3 + AgNO _3 \longrightarrow \underset {white\, \, ppt }{ AgCI\downarrow}$ (due to $CI^-$)

              $AgCI + 2NH _3 (aq) \longrightarrow [\underset{soluble}{Ag(NH _3) _2}] CI$

                      $SbCI _3 + H _2O \longrightarrow \underset{orange}{SbOCI}\downarrow + 2HCI$

                  $SbOCl + 2HCI \longrightarrow \underset{soluble}{SbCI _3}+H _2O$

                      $BiCI _3 + H _2O \longrightarrow \underset{white}{BiOCI\downarrow}+ 2HCI$

                  $BiOCI + 2HCI \longrightarrow \underset{soluble}{BiCI _3}+H _2O$
Turbidity can be dissolved in dil. $HCl$.