Alpha Question Bank for Engineering: Chemistry>Chapter 19 - The p-Block Elements>Exercise-4>Q 57

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Aluminium oxide exists in nature as gems with different colours. The reason for the difference in colour is that:

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Important Questions on The p-Block Elements

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Alpha Question Bank for Engineering: Chemistry>Chapter 19 - The p-Block Elements>Exercise-4>Q 58

White lead is

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Alpha Question Bank for Engineering: Chemistry>Chapter 19 - The p-Block Elements>Exercise-4>Q 59

In borax bead test, the borax used is

{Na}_{2} B_{4} O_{7} . 10 H_{2} O

. However, the species that is responsible for the test is:

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Alpha Question Bank for Engineering: Chemistry>Chapter 19 - The p-Block Elements>Exercise-4>Q 60

Thallium forms stable chloride,

TlCl

, unlike Aluminium which forms chloride

{AlCl}_{3}

. This is because:

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Alpha Question Bank for Engineering: Chemistry>Chapter 19 - The p-Block Elements>Exercise-4>Q 61

Silicones are water repelling in nature because-

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Alpha Question Bank for Engineering: Chemistry>Chapter 19 - The p-Block Elements>Exercise-4>Q 63

Lead dissolves most readily in dilute:

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Alpha Question Bank for Engineering: Chemistry>Chapter 19 - The p-Block Elements>Exercise-4>Q 64

The most abundant element in the earth's crust is:

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Alpha Question Bank for Engineering: Chemistry>Chapter 19 - The p-Block Elements>Exercise-4>Q 65

In chlorides, the common oxidation states of aluminium and thallium are

+ 3

and

+ 1

respectively

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Alpha Question Bank for Engineering: Chemistry>Chapter 19 - The p-Block Elements>Exercise-4>Q 66

{Sn}^{2 +}

compounds like

SnO

and

{SnCl}_{2}

are well known reducing agents, while

{PbO}_{2}

acts as an oxidizing agent. Which of the following statements support these reactivities?

I

.

S n O

is more stable than

Sn 0_{2}

i i

.

{Sn}^{4 +}

is more stable than

{Sn}^{2}

thore

I I I

.

P b^{4 +}

is more stable than

P b^{2}

IV.

P b^{2 +}

is more stable than

P b^{4}