Tag: chemical properties of metals and non metals

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Multiple choice chemistry reactivity series and electrochemistry reactivity series and displacement reactions chemical properties of metals chemical properties of metals and non metals

Out of $Cu, Ag, Fe$ and $Zn$, the metal which can displace all others from their salt solution is:

  1. $Ag$
  2. $Cu$
  3. $Fe$
  4. $Zn$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

This answer can be explained by Reduction potential values:

$Zn^{+2}+2e^- \longrightarrow Zn$  $[-0.76]$
$Ag^++e^- \longrightarrow Ag$         $[0.22]$
$Cu^++e^- \longrightarrow Cu$        $[0.52]$
$Fe^{+3}+e^- \longrightarrow Fe^{+2}$   $[0.77]$
As the reduction potential for $Zn$ is low it can replace that element from their compound state for which their reduction potential is above than that.

Multiple choice chemistry reactivity series and electrochemistry reactivity series and displacement reactions chemical properties of metals chemical properties of metals and non metals

$H^{+}$ ions are reduced at platinum electrode prior to__________.

  1. $Zn^{2+}$
  2. $Cu^{2+}$
  3. $Ag^{+}$
  4. $I _{2}$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

$H^+$ ions are reduced at platinum electrode prior to $Zn^{2+}$.

Because reduction potential of $\underset {(aq.)}{Zn^{+2}}+2e^- \longrightarrow Zn (s)$  $(-0.76)$
It means that it favours for oxidation rather than reduction.
Where reduction potential of $\underset {(aq.)}{2H^+}+2e^- \longrightarrow H _2 (g)$         $ (0)$
                                                  $\underset {(aq.)}{Cu^{+2}}+2e^- \longrightarrow Cu (s)$     $(0.16)$
                                                  $\underset {(aq.)}{Ag^+}+e^- \longrightarrow Ag(s)$         $(0.22)$
                                                  $\underset {(s)}{I _2}+2e^- \longrightarrow \underset {(aq.)}{2I^-} $               $(0.54)$

Multiple choice chemistry reactivity series and electrochemistry reactivity series and displacement reactions chemical properties of metals chemical properties of metals and non metals

Which one of the following four metals would be displaced from the solution of its salts by other three metals?

  1. $Mg$
  2. $Ag$
  3. $Zn$
  4. $Cu$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In a displacement reaction, a more reactive metal of the activity series can displace a less active one in its salt solution. Reactivity order is: 
$Mg> Zn> Cu> Ag.$
Thus, we see that Ag is least reactive and of the given four metals, Ag would be displaced from the solution of its salts by other three metals.

Multiple choice chemistry reactivity series and electrochemistry reactivity series and displacement reactions chemical properties of metals chemical properties of metals and non metals

A gas $Cl _{2}$ at $1\ atm$ is bubbled through a solution containing a mixture of $1\ M\ Br^{-1}$ and $1\ M\ F^{-1}$ at $25^{\circ}C$. If the reduction potential is $F > Cl > Br$, then

  1. $Cl$ will oxidise $Br$ and not $F$
  2. $Cl$ will oxidise $F$ and not $Br$
  3. $Cl$ will oxidise both $Br$ and $F$
  4. $Cl$ will reduce both $Br$ and $F$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Based on the reduction potential order F > Cl > Br, chlorine is a stronger oxidizing agent than bromine but weaker than fluorine. Therefore, chlorine will oxidize bromide ions (Br-) to bromine but cannot oxidize fluoride ions (F-).

Multiple choice chemistry reactivity series and electrochemistry reactivity series and displacement reactions chemical properties of metals chemical properties of metals and non metals

What happens when a piece of aluminium metal is added to dilute hydrochloric acid?

  1. Aluminium displaces hydrogen

  2. Aluminium chloride is formed along with dilute hydrochloric acid

  3. Hydrogen gas is evolved

  4. No reaction
Reveal answer Fill a bubble to check yourself
A,C Correct answer
Explanation

On adding aluminium(Al) to dilute hydrochloric acid(HCl), the following displacement reaction takes place:
$2Al(s)  +  6HCl(aq)  \rightarrow   2AlCl _{3}(aq)  +  3H _{2}(g)$
Aluminium being more reactive than hydrogen, displaces the latter in hydrochloric acid $(HCl)$ to form aluminium chloride($AlCl _{3}$).

Multiple choice chemistry reactivity series and electrochemistry reactivity series and displacement reactions chemical properties of metals chemical properties of metals and non metals

The correct order of increasing chemical reactivity is :

  1. $Zn < Fe < Mg < K$
  2. $Fe < Mg < Zn < K$
  3. $Fe< Mg < K < Zn$
  4. $Fe < Zn < Mg < K$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The reactivity series is a series in which metals are arranged in decreasing order of their reactivities.
$Fe<Zn<Mg<K$
In the reactivity series, the most active metal is at the left side of the series and the least active metal is at the right side of the series.

Multiple choice chemistry reactivity series and electrochemistry reactivity series and displacement reactions chemical properties of metals chemical properties of metals and non metals

Which of the following metals can displace the other three metals from their salt solutions?

  1. Iron

  2. Copper

  3. Zinc

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

Zinc is present above iron and copper in the activity series so it can displace both iron and copper from the salt solution. but question mention about other 3 so answer is none of these.

Multiple choice chemistry reactivity series and electrochemistry reactivity series and displacement reactions chemical properties of metals chemical properties of metals and non metals

Zinc sulphate forms a colourless solution in water. Colour on adding copper  is :

  1. blue

  2. black

  3. brown

  4. no change in colour
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

There will be no change in colour as copper(Cu) is less reactive metal than zinc(Zn) and thus cannot displace the latter from $ZnSO _{4}$ solution.