Tag: p-block elements

Quizzes (27) Questions (202)

Questions Related to p-block elements

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

The metal that cannot displace hydrogen from dilute hydrochlocric acid is 

  1. aluminium

  2. iron

  3. copper

  4. zinc

  5. magnesium
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Metals below hydrogen in the reactivity series, such as copper, cannot displace hydrogen from dilute acids. Aluminium, iron, zinc, and magnesium are all more reactive than hydrogen.

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

Name the ion(s) obtained when $HCl$ dissociates in aqueous solution.

  1. ${ H } _{ 3 }{ O }^{ + }$
  2. ${ Cl }^{ - }$
  3. Both $A$ and $B$

  4. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Acidic nature of $HCl$ is due to hydrogen ions which reacts with water to form hydronium ions. 
$HCl(g) +{ H } _{ 2 }O \rightleftharpoons { H } _{ 3 }{ O }^{ + }+{ Cl }^{ - }$

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

Equations relating to acidic properties of an aq. solution of HCl gas is/are :

  1. $HCl\left( g \right) +{ H } _{ 2 }O\rightleftharpoons { H } _{ 3 }{ O }^{ + }+{ Cl }^{ - }$
  2. $Zn\left( OH \right) _{ 2 }+2{ H }Cl\rightarrow { ZnCl } _{ 2 }+2{ H } _{ 2 }O$
  3. $ { MnO } _{ 2 }+4HCl\rightarrow { MnCl } _{ 2 }+{ Cl } _{ 2 }+2{ H } _{ 2 }O$

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

1) $HCl\left( g \right) +{ H } _{ 2 }O\rightleftharpoons { H } _{ 3 }{ O }^{ + }+{ Cl }^{ - }$
2) ${ 2KMnO } _{ 4 }+16HCl\rightarrow { 2MnCl } _{ 2 }+{ 8H } _{ 2 }O+2KCl+{ 5Cl } _{ 2 }$
3) $ { MnO } _{ 2 }+4HCl\rightarrow { MnCl } _{ 2 }+{ Cl } _{ 2 }+2{ H } _{ 2 }O$
4) $Zn\left( OH \right) _{ 2 }+{ H }Cl\rightarrow { ZnCl } _{ 2 }+{ H } _{ 2 }O$

All of the above equation shows the acidic properties of hydrochloric acid.

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

    Appearance  Reaction with dilute $HCl$  Reaction with dilute $HNO _3$
 Unknown metal #1  Dull gray solid with white oxide coating Dissolved with bubbles of clear gas   Dissolved with bubbles of clear gas
 Unknown metal #2  Solid; lustrous, smooth silver-gray surface  No reaction  Dissolved with bubbles of orange gas

Identify metal #1.

  1. Mercury

  2. Copper

  3. Zinc

  4. Iron

  5. Silver
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

 Zinc being an active metal readily reacts with hydrochloric acid at room temperature to form soluble zinc chloride and hydrogen.

   $Zn+2{ H }Cl\rightarrow Zn{ Cl } _{ 2 }+{ H } _{ 2 }$
Zinc reacts with dilute nitric acid  and libreates nitric oxie.
$3Zn+{ 8HNO } _{ 3 }\rightarrow { 3Zn(NO _{ 3 }) } _{ 2 }+4{ H } _{ 2 }O+2NO$

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

Statement I : The reactivity of powdered zinc will be greater than the larger piece of zinc of the same mass with $\displaystyle HCl$.
Statement II : The larger piece of zinc of the same mass has more surface area than the powdered zinc.

  1. True, False

  2. False, True

  3. True, True

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

Statement I : The reactivity of powdered zinc will be greater than the larger piece of zinc of the same mass with HCl.
Statement II : The  powdered zinc has more surface area than the larger piece of zinc of the same mass. Higher is the surface area, higher is the reactivity.

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

Which of the following is produced by the reaction of zinc metal, $Zn$ and hydrochloric acid, $HCl$?
I. $H _2(g)$
II. $Cl _2(g)$
III. $Zn^{2+}(aq)$

  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

$\displaystyle H _2$ and $\displaystyle Zn^{2+}$ is produced by the reaction of zinc metal, $Zn$, and hydrochloric acid, $HCl$.
$\displaystyle Zn + 2HCl  \rightarrow ZnCl _2 + H _2$

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

The addition of dilute $HCl$ to unknown metal produced a transparent gas. What is the likely identity of this gas?

  1. $Cl _{2}$
  2. $H _{2}$
  3. $O _{2}$
  4. $CO _{2}$
  5. $NO _{2}$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Metals that come before hydrogen in the reactivity series form their corresponding chlorides when heated with HCl and liberate hydrogen gas.

Eg:
$Ca+2HCl\rightarrow { CaCl } _{ 2 }+{ H } _{ 2 }$

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

| |  Appearance |  Reaction with dilute $HCl$ |  Reaction with dilute $HNO _3$ | | --- | --- | --- | --- | |  Unknown metal #1 |  Dull gray solid with white oxide coating | Dissolved with bubbles of clear gas  |  Dissolved with bubbles of clear gas | |  Unknown metal #2 |  Solid; lustrous, smooth silver-gray surface |  No reaction |  Dissolved with bubbles of orange gas |

Identify metal #2.

  1. Carbon

  2. Copper

  3. Zinc

  4. Sodium

  5. Silver
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Silver has a lustrous smooth gray surface.

It reacts with $HNO _3$ as:
$3Ag+2{ HNO } _{ 3 }\rightarrow { 4AgNO } _{ 3 }+{ NO } _{ 2 }+{ H } _{ 2 }O$.
The orange gas obtained is $NO _2$.