Al 2 O 3 can be converted to anhydrous AlCl 3 by heating-

a mixture of A l 2 O 3 and carbon in dry C l 2 gas

A l 2 O 3 with NaCl in solid-state

monobasic and weak Bronsted acid

monobasic and strong Lewis acid

tribasic and weak Bronsted acid

CO 2 and N 2 are non-supporters of combustion. However, for putting out fires CO 2 is preferred over N 2 because CO 2 :

Forms non-combustible products with burning substances.

Chemistry - Pblock Elements Xi - Quiz-4

Al₂O₃ can be converted to anhydrous AlCl₃ by heating-

0%

$A l_{2} O_{3} w i t h H C l g a s$
0%

$A l_{2} O_{3}$ with NaCl in solid-state
0%

a mixture of $A l_{2} O_{3}$ and carbon in dry $C l_{2}$ gas
0%

$A l_{2} O_{3}$ with $C l_{2}$ gas

Which of the following species is not stable?

0%

${[{SiCl}_{6}]}^{2 -}$
0%

${[{SiF}_{6}]}^{2 -}$
0%

${[{GeCl}_{6}]}^{2 -}$
0%

${[Sn {(OH)}_{6}]}^{2 -}$

An acid among the following is-

0%

$B {(OH)}_{3}$
0%

$Al {(OH)}_{3}$
0%

$Fe {(OH)}_{3}$
0%

None of the above

Boric acid is polymeric because of:

0%

Its acidic nature
0%

Presence of hydrogen bonds
0%

Its monobasic nature
0%

Its geometry

Boric acid on heating at $150 ° C$ gives:

0%

$B_{2} O_{3}$
0%

$H_{2} B_{4} O_{7}$
0%

${HBO}_{2}$
0%

$H_{2} {BO}_{3}$

The product formed in the reaction,

$B C l_{3} + H_{2} O \to$ Product is:

0%

$H_{3} B O_{3} + H C l$
0%

$B_{2} O_{3} + H O C l$
0%

$B_{2} H_{6} + H C l$
0%

no reaction

$H_{3} B O_{3}$ is:

0%

monobasic and weak Lewis acid
0%

monobasic and weak Bronsted acid
0%

monobasic and strong Lewis acid
0%

tribasic and weak Bronsted acid

On the addition of mineral acid to an aqueous solution of borax, the compound formed is:

0%

borodihydride
0%

orthoboric acid
0%

metaboric acid
0%

pyroboric acid

Borax is prepared by treating boric acid with:

0%

$N a N O_{3}$
0%

NaCl
0%

$N a_{2} C O_{3}$
0%

$N a H C O_{3}$

The main factor responsible for weak acidic nature of B-F bonds in $B F_{3}$ is:

0%

large electronegativity of F
0%

three centred two electrons bonds in $B F_{3}$
0%

px- $d π$ back bonding
0%

$p π - pπ$ back bonding

Which among the following is a gas?

0%

$B F_{3}$
0%

$B C l_{3}$
0%

$B B r_{3}$
0%

$B I_{3}$

B-F bond order in $B F_{3}$ is:

0%

1
0%

2
0%

3
0%

4/3

Aluminium reacts with nitrogen to form:

0%

AlN
0%

$A l_{2} N_{3}$
0%

$A l_{2} N$
0%

$A l_{4} N_{6}$

Which metal is powdered, suspended in oil and used as paint?

0%

Fe
0%

Sn
0%

Ag
0%

Al

Aluminium metal is corroded in coastal places near to the sea, because protective oxide film:

0%

is removed by sea water
0%

reacts with sea water
0%

is attacked by salts present in sea water
0%

reacts with sand particles

Aluminium deposited as vapours on glass forms a good mirror, essentially because:

0%

it has better shine than Ag
0%

it does not scratch
0%

coating is much smoother
0%

it does not tarnish in air

Conc. $H N O_{3}$ can be stored in a container of:

0%

Cu
0%

Al
0%

Zn
0%

Sn

Duralumin is an alloy of:

0%

Al and Mg
0%

Mg and Cu
0%

Al, Mg, Mn and Cu
0%

Al and Cu

Aluminium is not used:

0%

In thermite welding
0%

As oxidiser in metallurgy
0%

For making utensils
0%

In silvery paints

When Al is added to the potassium hydroxide solution:

0%

No reaction takes place
0%

Oxygen gas is evolved
0%

Water is produced
0%

Hydrogen gas is evolved

A metal powder if spread in air, becomes hazardous is-

0%

Al
0%

B
0%

Ca
0%

K

CO₂ and N₂ are non-supporters of combustion. However, for putting out fires CO₂ is preferred over N₂ because CO₂:

0%

Does not burn.
0%

Forms non-combustible products with burning substances.
0%

Is denser than nitrogen.
0%

Is a more reactive gas.

When sodium or potassium oxide is heated in a current of $C O_{2} a t 360 ° C$ , we get:

0%

sodium formate
0%

sodium oxalate
0%

sodium acetate
0%

sodium carbonate

Which can be directly brought into gaseous state from solid state?

0%

CO
0%

Solid $C O_{2}$
0%

$P H_{3}$
0%

$C O + H_{2}$

Which is amphoteric oxide?

0%

ZnO
0%

MnO^-₄
0%

CO₂
0%

SiO

Which is a true acid anhydride?

0%

$A l_{2} O_{3}$
0%

CO
0%

CaO
0%

$C O_{2}$

$C C l_{4}$ does not show hydrolysis but $S i C l_{4}$ is readily hydrolysed because:

0%

carbon cannot expand its octet but silicon can expand.
0%

electronegativity of carbon is higher than of silicon
0%

IP of carbon is higher than of silicon
0%

carbon forms double and triple bonds but not silicon

Which is formed when $S i C l_{4}$ vapours are passed over hot Mg?

0%

$S i C l_{2} + M g C l_{2}$
0%

$S i + M g C l_{2}$
0%

$M g_{2} S i + C l_{2}$
0%

$M g S i C l_{6}$

Asbestors is chemically:

0%

silicate of calcium and magnesium
0%

calcium alumino silicate
0%

magnesium alumino silicates
0%

calcium silicate + calcium aluminates

Aqueous solution of sodium silicate is:

0%

neutral
0%

insoluble
0%

acidic
0%

alkaline

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Practice Chemistry Quiz Questions and Answers

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Practice Chemistry Quiz Questions and Answers

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