Tag: reactivity series and electrochemistry

Quizzes (5) Questions (59)

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

X, Y, Z are three elements which undergo chemical changes according to the following equations:
$I:\, X _2O _3 + 2Y \rightarrow Y _2O _3 + 2X$
$II:\, Y _2O _3 + 3Z \rightarrow 3ZO + 2Y$
The order of increasing reactivity is:

  1. X < Y < Z

  2. Y < X < Z

  3. Z < X < Y

  4. Z < Y < X
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Y has displaced X in reaction I. So, Y is more reactive than X.
Z has displaced Y is reaction II. So, Z is more reactive than Y. 

Thus, Z is most reactive and X is the least reactive.

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 statement is incorrect?

  1. Metals like $Cu, Ag, Au$ cannot displace $H$ from acids

  2. In reactivity series metals are arranged in order of increasing reactivity
  3. Silver cannot displace $Cu$ form $Cu(NO _3) _2$
  4. Zinc displaces $Cu$ from $CuSO _4$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In activity series metals are arranged in decreasing order of reactivity. The metals present at top of the series are highly reactive while metals present at the bottom are relatively inert in nature.

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

Metals which loses electrons more easily than hydrogen are more reactive than $H _2$ and they can :

  1. not displace $H _2$ from dilute acids

  2. displace hydrogen from dilute acids

  3. not react with water easily

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

Metals present on top of the reactivity series above the hydrogen can displace the metals present below them from their salt solution.

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

Iron can displace ________ from its solution.

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

Iron can displace $Cu$ from its solution

Reactivity series: Highest $\longrightarrow$ Lowest
$K>Na>Ca>Mg>Al>Zn>Fe>Sn>Pb>Cu>Ag>Au$
Highly reactive elements can displace less reactive elements from their solution.

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

Copper can be displaced from aqueous solution of copper sulphate by adding:

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

$Fe(s)+CuSO _4(aq)\longrightarrow Cu(s)+FeSO _4(aq)$

Metals like $Zn, Pb, Fe$ and $Al$, displace $Cu$ from copper salt solution.
Reactivity series of metals: $K>Na>Ca>Mg>Al>Zn>Fe>Sn>Pb>Cu>Ag>Au$
So, $K$ is most reactive and $Au$ is least reactive. Metals which are more reactive than that element can displace that element from its salt solution.

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

An element is oxidized by fluorine but not by chlorine, could this element is oxidized?

  1. Sodium

  2. Sulphur

  3. Oxygen

  4. Aluminium
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Oxygen is the second most electronegative element in the periodic table and has electronegative value 3.5. So, it creates polarity that strongly attract the electron towards itself.

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

If $A, B, C, D, E, F, G, H, I, J, K$ represents metals in the decreasing order of their reactivity, which one of item is most likely, to occur in a free state in nature?

  1. A

  2. C

  3. J

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

Metal higher in the activity series is said to be more metallic than another which is below and the metals at the top of the activity series are so reactive that they are never found in nature in free state.

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

Mark the incorrect statement.

  1. Reactive metals can displace less reactive metals from their compounds in solution

  2. All metals are not equally reactive

  3. Both A and B

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

Reactive metals can displace less reactive metals from their compounds in solution or molten form. All metals are not equally reactive. Their reactivity is different for different metals.

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 oxides can't be reduced by carbon?

  1. Sodium, magnesium, calcium, aluminium

  2. Sodium, potassium, tin, lead

  3. Both A and B

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

Carbon cannot reduce the oxides of sodium, magnesium, calcium, aluminium etc. to the respective metals. This is because these metals have more affinity for oxygen than carbon.