Chemistry Test

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Chemistry Test - 1

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Weekly Quiz Competition

Question 1
3 / -1

The alcohol manufactured from water gas is

A
Ethanol

B
Methanol

C
Isobutanol

D
Butanol

Solution

Water gas and H₂ reacts to produce methanol.
Question 2
3 / -1

One gm of oxygen at NTP occupies the volume

A
2.4 litre

B
4.8 litre

C
1.4 litre

D
1.2 litre

Solution

We know that the atomic weight of oxygen is 16. At NTP volume of 16 gm of oxygen is 22.4 litre. Hence, volume of 1 gm of oxygen at NTP
Question 3
3 / -1

Number of unpaired electrons in 1s², 2s² 2p³ is

A
1

B
2

C
3

D
4

Solution
Question 4
3 / -1

When primary amine is heated with CS2 in presence of excess of mercuric chloride, it produce isothiocyanate. This reaction is known as

A
Hoffmann bromide reaction

B
Carbylamine reaction

C
Hoffmann mustard oil reaction

D
Hinsberg's reaction

Solution

Primary amine on heating with CS₂ is presence of excess of HgCI₂ produce ethyl isothiocyanate which has smell of mustard oil. Therefore, it is known as Hoffmann’s mustard oil reaction.
Question 5
3 / -1

The most stable carbonium ion is

A

B

C

D

Solution

The most stable carbonium ion is triphenyl methyl carbonium ion because the π-electrons of three benzene rings are delocalized with tb vacant π-orbital of central carbon atom. Therefore, it is stabilized by resonance.
Question 6
3 / -1

Total number of electrons in all the p-orbitals of bromine will be

A
7

B
9

C
15

D
15

Solution

The electronic configuration of bromine atom is

1s², 2s² 2p⁶, 3s² 3p⁶ 3d¹⁰,4s² 4p⁵

Hence, total number of p-electrons is 17.
Question 7
3 / -1

Flux is used to remove

A
silica

B
metal oxide

C
silica and metal oxide

D
impurities from ore

Solution

Flux is used to remove silica and undesirable metal oxide. It is an external material added during smelting to convert infusible impurities into an easily fusible material known as slag.
Question 8
3 / -1

Ionization constant of acetic acid is 1.8 * 10-5. The concentration of H+ ions in 0.1 M solution is

A
1.8 x 10^-3 M

B
1.8 x 10^-5 M

C
1.3 * 1 0^-3 M

D
1.34 * 10^-3 M

Solution

Since, acetic acid is a weak electrolyte, hence
Question 9
3 / -1

Acetone and acetaldehyde can be identified by

A
Molisch test

B
bromo form test

C
Schiffs test

D
iodoform test

Solution

Acetaldehyde and acetone both comes under carbonyl group. Both respond to 2, 4-dinitrophenyl hydrazine to produce yellow or orange precipitate. Aldehydes produce colour with Schiff’s reagent while ketones do not respond to this test.
Question 10
3 / -1

On heating one end of a piece of metal, tlhe other end becomes hot because of

A
Mobility of atoms in the metal

B
Resistance of the metal

C
Minor purturbation in the energy of the metal

D
Energised electrons moving to the other end

Solution

On heating the one end of the metal piece the other end becomes hot this is due to the movement of energised electrons from one end to other end.