d and f-Block Elements Test

Result

d and f-Block Elements Test - 20

Score
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Rank
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TIME Taken - -

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Weekly Quiz Competition

Question 1
1 / -0

(T) imparts violet colour (V) Red gas (W) Red ppt.
(W) Red ppt. white ppt.
(U) gas (gives white fumes with HCl)
sublimes on heating Identify (T) to (Z).

A
T = KMnO₄, U = HCl, V = Cl₂, W = HgI₂, X =Hg(NH₂)NO₃, Y = Hg₂Cl₂, Z = N₂

B
T = K₂Cr₂O₇, U = NH₄Cl, V = CrO₂Cl₂, W = Ag₂CrO₄, X = [Ag(NH₃)₂]⁺, Y = AgCl,Z=NH₃

C
T = K₂CrO₄, U = KCl, V = CrO₂Cl₂, W = HgI₂, X = Na₂CrO₄, Y = BaCO₃, Z = NH₄Cl

D
T = K₂MnO₄, U = NaCl, V = CrO₃, W = AgNO₂, X = (NH₄)₂CrO₄, Y = CaCO₃, Z = SO₂

Solution

The correct answer is option B
Question 2
1 / -0

The number of moles of acidified KMnO₄ required to convert one mole of sulphite ion into sulphate ion is-

A
2/5

B
3/5

C
4/5

D
1

Solution
Question 3
1 / -0

N₂(g) + 3H₂ (g) 2NH₃(g) ; Haber's process, Mo is used as -

A
A catalyst

B
A catalytic promoter

C
An oxidising agent

D
As a catalytic poison

Solution

MO is catalytic promoter & it improves catalytic properties as catalyst
Question 4
1 / -0

Iron becomes passive by..................due to formation of ................

A
Dil. HCl, Fe₂O₃

B
80% conc. HNO₃, Fe₃O₄

C
Conc. H₂SO₄, Fe₃O₄

D
Conc. HCl, Fe₃O₄

Solution

Fe + HNO₃ → Fe₂O₃ + NO₂ + H₂O
80%
Question 5
1 / -0

Bayer's reagent used to detect olifinic double bond is-

A
Acidified KMnO₄

B
Aqueous KMnO₄

C
1% alkaline KMnO₄ solution

D
KMnO₄ in benzene

Solution

Cold dilute alkaline KMnO₄ is Bayer’s neagent.