Beta Question Bank for Engineering: Chemistry>Chapter 20 - The d- and f-Block Elements>EXERCISE-1>Q 20

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${({NH}_{4})}_{2} {Cr}_{2} O_{7}$ (Ammonium dichromate) is used in fire works. The green coloured powder blown in air is:

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Important Questions on The d- and f-Block Elements

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Beta Question Bank for Engineering: Chemistry>Chapter 20 - The d- and f-Block Elements>EXERCISE-1>Q 21

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

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Beta Question Bank for Engineering: Chemistry>Chapter 20 - The d- and f-Block Elements>EXERCISE-1>Q 22

Question Image

x, y

and

z

Are respectively :

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Beta Question Bank for Engineering: Chemistry>Chapter 20 - The d- and f-Block Elements>EXERCISE-1>Q 23

In the equation :

M + 8 {CN}^{-} + 2 H_{2} O + O_{2} ⟶ 4 {[M (CN)_{2}]}^{-} + 4 {OH}^{-}

, metal

M

is :

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Beta Question Bank for Engineering: Chemistry>Chapter 20 - The d- and f-Block Elements>EXERCISE-1>Q 24

A metal

M

which is not affected by strong acids like conc.

{HNO}_{3}

, conc.

H_{2} {SO}_{4}

and conc. solution of alkalies like

NaOH, KOH

forms

{MCl}_{3}

which finds use for toning in photography. The metal

M

is:

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Beta Question Bank for Engineering: Chemistry>Chapter 20 - The d- and f-Block Elements>EXERCISE-1>Q 25

Number of moles of

{SnCl}_{2}

required for the reduction of

K_{2} {Cr}_{2} O_{7}

into

{Cr}_{2} O_{3}

is (in acidic medium):

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Beta Question Bank for Engineering: Chemistry>Chapter 20 - The d- and f-Block Elements>EXERCISE-1>Q 26

The Ziegler-Natta catalyst used for polymerisation of ethene and styrene is

{TiCl}_{4} + {(C_{2} H_{5})}_{3} Al

, the catalysing species (active species) involved in the polymerisation is :

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Beta Question Bank for Engineering: Chemistry>Chapter 20 - The d- and f-Block Elements>EXERCISE-1>Q 27

Which of the following raction is possible at anode?

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Beta Question Bank for Engineering: Chemistry>Chapter 20 - The d- and f-Block Elements>EXERCISE-1>Q 28

Colourles solution of the following four salts are placed separately in four different test tubes and a strip of coper is dipeed in each one of these. Which solution will turn blue?