Beta Question Bank for Engineering: Chemistry>Chapter 16 - The s-Block Elements>EXERCISE-1>Q 8

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(Yellow ppt) $T \overset{K_{2} {CrO}_{4}}{⟶} X \overset{dil. HCl}{⟶} Y$ (Yellow ppt) $+ Z ↑$ (pungent smelling gas) If $X$ gives green flame test. Then, $X$ is:

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Important Questions on The s-Block Elements

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Beta Question Bank for Engineering: Chemistry>Chapter 16 - The s-Block Elements>EXERCISE-1>Q 9

The reaction of an element

A

with water produces combustible gas

B

and an aqueous solution of

C .

When another substance

D

reacts with this solution

C

also produces the same gas

B .

D

also produces the same gas even on reaction with dilute

H_{2} {SO}_{4}

at room temperature. Element

A

imparts golden yellow colour to Bunsen flame. Then

A, B, C

and

D

may be identified as :

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Beta Question Bank for Engineering: Chemistry>Chapter 16 - The s-Block Elements>EXERCISE-1>Q 10

In electrolysis of

NaCl

when

Pt

electrode is taken then

H_{2}

is liberated at cathode while with

Hg

cathode it forms sodium amalgam:

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Beta Question Bank for Engineering: Chemistry>Chapter 16 - The s-Block Elements>EXERCISE-1>Q 11

Maximum thermal stability is shown by

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Beta Question Bank for Engineering: Chemistry>Chapter 16 - The s-Block Elements>EXERCISE-1>Q 12

The stable superoxide is formed by the element

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Beta Question Bank for Engineering: Chemistry>Chapter 16 - The s-Block Elements>EXERCISE-1>Q 13

Calcium is obtained by the

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Beta Question Bank for Engineering: Chemistry>Chapter 16 - The s-Block Elements>EXERCISE-1>Q 14

Which of the following does not illustrate the anomalous properties of

Li ?

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Beta Question Bank for Engineering: Chemistry>Chapter 16 - The s-Block Elements>EXERCISE-1>Q 17

A metal

X

on heating in nitrogen gas gives

Y .

on treatment with

H_{2} O

gives a colourless gas which when passed through

{CuSO}_{4}

solution gives a blue colour.

Y

is -

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Beta Question Bank for Engineering: Chemistry>Chapter 16 - The s-Block Elements>EXERCISE-1>Q 18

The substance not likely to contain

{CaCO}_{3}

is