p-Block Elements Test

Result

p-Block Elements Test - 9

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Weekly Quiz Competition

Question 1
4 / -1

Which of the following is used to prepare Cl₂ gas at room temperature from concentrated HCl?

A
MnO₂

B
H₂S

C
KMnO₄

D
Cr₂O₃

Solution

KMnO₄ reacts with concentrated HCl to produce chlorine gas.
2KMnO₄ + 16HCl ⟶ 2KCl + 2MnCl₂ + 8H₂O + 5Cl₂
Question 2
4 / -1

If chlorine is passed through a solution of hydrogen sulphide in water, the solution turns turbid due to the formation of:

A
Free chlorine

B
Free sulphur

C
Nascent oxygen

D
Nascent hydrogen

Solution

If chlorine is passed through a solution of hydrogen sulphide in water, the solution turns turbid due to the formation of free sulfur
Hydrogen sulfide is oxidized by chlorine producing sulfur and hydrochloric acid.
Cl₂ + H₂S → S + 2HCl.
Question 3
4 / -1

A black powder when heated with conc. HCl gives a greenish yellow gas. The gas acts as an oxidizing and a bleaching agent. When it is passed over slaked lime, a white powder is formed which is a ready source of gas. The black powder and white powder respectively are:

A
KClO₃ and NaClO₃

B
MnO₂ and Ca(OCl)₂

C
MnO₂ and KClO₃

D
MnCl₄ and COCl₂

Solution

Bleaching agent is Ca(OCl)₂.
Black powder + HCl
Question 4
4 / -1

On heating KClO₃ we get:

A
KClO₂ + O₂

B
KCl + O₂

C
KCl + O₃

D
KCl + O₂ + O₃
Question 5
4 / -1

When three parts of conc. HCl and one part of conc. HNO₃ is mixed, a compound 'X' is formed. The correct option related to 'X' is:

A
'X' is known as aqua-regia

B
'X' is used for dissolving gold

C
'X' is used for decomposition of salts of weaker acids

D
both (a) and (b)

Solution

Aqua regia is used for dissolving noble metals like gold, platinum. HCI decomposes salts of weaker acids e.g., carbonates, hydrogen carbonates, sulphites, etc.