The p-Block Elements Test

Result

The p-Block Elements Test - 74

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following compounds of boron does not exist in the free form?

A
$$BCl_3$$

B
$$BF_3$$

C
$$BBr_3$$

D
$$BH_3$$

Solution

Hydride of boron does not exist in $$BH_3$$ form. It is stable as its dimer diborane ($$B_2H_6$$)

Option D is correct.
Question 2
1 / -0

Composition of borax is

A
$$Na_2B_4O_7.4H_2O$$

B
$$Na_2B_4O_7.10H_2O$$

C
$$NaBO_2$$

D
$$Na_2BO_3$$

Solution

Borax is $$\mathrm{Na_2B_4O_7.10H_2O}$$
Hence, Option "B" is the correct answer.
Question 3
1 / -0

Column-I Column-II
$$A: He$$ $$i: $$ High electron affinity
$$B: Cl$$ $$ii:$$ Most electropositive element
$$C: Ca$$ $$iii:$$ Strongest reducing agent
$$D: Li$$ $$iv:$$ Highest ionization energy
The correct match of contents in Column -I with those in Column -II is:

A
$$A-iii, B-i, C-ii, D-iv$$

B
$$A-iv, B-iii, C-ii, D-i$$

C
$$A-i, B-ii, C-iii, D-iv$$

D
$$A-iv, B-i, C-ii, D-iii$$

E
$$A-ii, B-iv, C-i, D-iii$$

Solution
Question 4
1 / -0

Which reagent is used to remove $$SO_{4}^{2-}$$ and $$Cl^{-}$$?

A
$$BaSO_{4}$$

B
$$NaOH$$

C
$$Pb(NO_{3})_{2}$$

D
$$KOH$$

Solution

$$PbSO_{4}$$ and $$PbCl_{2}$$ are insoluble in cold water hence the reagent $$Pb(NO_{3})_{2}$$ is used to remove $$SO_{4}^{2-}$$ and $$Cl^{-}.$$
Question 5
1 / -0

In the electrothermal process, the compound displaced by silica from calcium phosphate is:

A
Calcium

B
Phosphine

C
Phosphorus

D
Phosphorus pentoxide

Solution

In the electrothermal process, the compound displaced by silica from calcium phosphate is phosphorus pentoxide. It is then reduced by coke in electric furnace to get white phosphorus.

$$Ca_3(PO_4)_2 +3SiO_2 \to 3CaSiO_3 +P_2O_5$$
Question 6
1 / -0

In laboratory silicon can be prepared by the reaction :

A
By heating Carbon in electric furnace

B
By heating Potassium with Potassium dichromate

C
Silica with Magnesium

D
None of these

Solution

In laboratory, Silicon is prepared by the reaction of Silica with Magnesium.
Reaction :

$$\mathrm{SiO_2 + 2Mg \rightarrow Si +2MgO}$$

Hence, Option "C" is the correct answer.
Question 7
1 / -0

Silica is added to roasted copper ore during smelting in order to remove

A
Cuprous sulphide

B
Cuprous oxide

C
Ferrous oxide

D
Ferrous sulphide

Solution

Silica is added during smelting in order to remove iron oxides from copper sulphide and oxides as slag.

$$ \underset{\text{Impurity}}{FeO}+\underset{\text{Flux}}{SiO_2} \rightarrow \underset{\text{Slag}}{FeSiO_3}$$
Question 8
1 / -0

Increasing order of stability of the +2 oxidation state of the ions ?

A
$$Ca^{2+} < Ba^{2+} < Sr^{2+}$$

B
$$Pb^{2+} < Ge^{2+} < Sn^{2+}$$

C
$$Ge^{2+} < Sn^{2+} < Pb^{2+}$$

D
$$Cu^{2+} < Au^{2+} < Ag^{2+} $$

Solution

According to inert pair effect, the +2 oxidation state is more stable down the group.
The relative stability of the +2 oxidation state increases on moving from top to bottom.

Hence option C is correct.
Question 9
1 / -0

Which of the following compounds does not exist?

A
$$SbCl_3$$

B
$$BiCl_5$$

C
$$SbCl_5$$

D
$$AsCl_5$$

Solution

$$BiCl_5$$ does not not exist because $$+3$$ oxidation state of $$Bi\ $$ is more stable than $$+5$$ due to inert pair effect.
Question 10
1 / -0

Which of the following halides is inert towards hydrolysis at room temperature?

A
$$SiCl_4$$

B
$$PCl_3$$

C
$$NCl_3$$

D
$$NF_3$$

Solution

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Re-Attempt Weekly Quiz Competition

Column-I	Column-II
$$A: He$$	$$i: $$ High electron affinity
$$B: Cl$$	$$ii:$$ Most electropositive element
$$C: Ca$$	$$iii:$$ Strongest reducing agent
$$D: Li$$	$$iv:$$ Highest ionization energy

The p-Block Elements Test - 74

Result

The p-Block Elements Test - 74

Score

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Rank

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SHARING IS CARING

Question 1

$$BCl_3$$

$$BF_3$$

$$BBr_3$$

$$BH_3$$

Solution

Question 2

$$Na_2B_4O_7.4H_2O$$

$$Na_2B_4O_7.10H_2O$$

$$NaBO_2$$

$$Na_2BO_3$$

Solution

Question 3

$$A-iii, B-i, C-ii, D-iv$$

$$A-iv, B-iii, C-ii, D-i$$

$$A-i, B-ii, C-iii, D-iv$$

$$A-iv, B-i, C-ii, D-iii$$

$$A-ii, B-iv, C-i, D-iii$$

Solution

Question 4

$$BaSO_{4}$$

$$NaOH$$

$$Pb(NO_{3})_{2}$$

$$KOH$$

Solution

Question 5

Calcium

Phosphine

Phosphorus

Phosphorus pentoxide

Solution

Question 6

By heating Carbon in electric furnace

By heating Potassium with Potassium dichromate

Silica with Magnesium

None of these

Solution

Question 7

Cuprous sulphide

Cuprous oxide

Ferrous oxide

Ferrous sulphide

Solution

Question 8

$$Ca^{2+} < Ba^{2+} < Sr^{2+}$$

$$Pb^{2+} < Ge^{2+} < Sn^{2+}$$

$$Ge^{2+} < Sn^{2+} < Pb^{2+}$$

$$Cu^{2+} < Au^{2+} < Ag^{2+} $$

Solution

Question 9

$$SbCl_3$$

$$BiCl_5$$

$$SbCl_5$$

$$AsCl_5$$

Solution

Question 10

$$SiCl_4$$

$$PCl_3$$

$$NCl_3$$

$$NF_3$$

Solution

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