Tag: reactivity series and electrochemistry

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Questions Related to reactivity series and electrochemistry

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

The reactivity series is a list of metals arranged in the order of their _______ activities.

  1. decreasing

  2. Increasing

  3. chemical

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

The reactivity series is a series of metals, arranged in order of reactivity from highest to lowest. It is used to determine the products of single displacement reactions, whereby metal A will replace another metal B in a solution if A is higher in 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

The metallic oxide/s which cannot be reduced by normal reducing agents.

  1. Magnesium oxide
  2. Copper $(II)$ oxide

  3. Zinc oxide
  4. Iron $(III)$ oxide
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Among given metal oxides, magnesium have very low reduction potential so it can not be reduced by normal reducing agents.

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

Name a metal from the activity series which displaces hydrogen from steam?

  1. Zinc

  2. Iron

  3. Copper

  4. Magnesium
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Magnesium can displace hydrogen from steam. Mg is better reducing agent than hydrogen as Mg les above hydrogen in the reactivity series.
Hence, the tendency for the reaction $\displaystyle Mg \rightarrow Mg^{2+} + 2e^-$ is greater than the tendency for the reaction $\displaystyle 2H^+ + 2e^- \rightarrow H _2$. Hence, Mg will be oxidised and $\displaystyle H^+$ will be reduced.

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

Metals above hydrogen in activity series :

  1. react with base to liberate hydrogen ions

  2. react with acids to liberate hydrogen gas

  3. react with water at ordinary temperature

  4. none of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The activity series is a listing of the metals in decreasing order of their reactivity with hydrogen ion sources such as water and acids. In the reaction with hydrogen ion source the metal is oxidized to a metal ion and the hydrogen is reduced to hydrogen gas. They are also good reducing agents and poor oxidizing agents.

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

A small piece of silver is placed in a solution containing both magnesium nitrate and copper (II) nitrate. Which one of the following occurs?

  1. No reaction takes place

  2. The silver dissolves and only copper is precipitated

  3. The silver dissolved and only magnesium is precipitated

  4. A mixture of magnesium and copper forms on the silver
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Silver is the metal which is present at the bottom of reactivity series below $Mg$ and $Cu$ metals so it cannot displace these metals from its solution. In this case, no reaction takes place by this piece of silver.

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

In order to prevent the spoilage of potato chips, they are packed in plastic bags in an atmosphere of:

  1. $Cl _2$
  2. $H _2$
  3. $N _2$
  4. $O _2$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

In order to prevent the spoilage of potato chips, they are packed in plastic bags in an atmosphere of $N _2$ to prevent from being rancid or oxidised. 
Nitrogen is added to the potato chip packet to add strength to the packaging. Normally aluminium cans are used for packaging beverages, these beverages are carbonated drinks and the carbon dioxide present in them provides the internal pressure in the can and thus gives internal strength to the aluminium can. But in non-carbonated drinks, there is no carbon dioxide present and so Nitrogen is added to it to give the required strength to the packing.

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

Two metals lighter than water are:

  1. $Li,\ Na$
  2. $Al,\ Mn$
  3. $Pb,\ Mg$
  4. $Co,\ Mn$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

$Li$ and $Na$ both metals belong to the alkali metals.


They are soft metals and have low ionization enthalpy,


Lithium is lighest elemental metal nearly half as dense as water, so if floats on the surface and ultimately diasppears, giving off hydrogen gas and forming a colourless solution of lothium hydroxide.

Sodium is also lighter than water nad have a density of $0.971 g/cm^3$,

hence, $Li$ and $Na$ both metals are lighter than water.


Hence, the correct option is $\text{A}$