Chemistry Test

Result

Chemistry Test - 18

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Weekly Quiz Competition

Question 1
1 / -0

In Bosch's process, which gas is utilised for the production of elemental carbon?

A
Producer gas

B
Water gas

C
Coal gas

D
Natural gas

Solution
Question 2
1 / -0

One fermi is?

A
10⁻¹⁵cm

B
10⁻¹³cm

C
10⁻¹⁰cm

D
10⁻¹²cm

Solution

One fermi= 10⁻¹⁵m = 10⁻¹³cm.
Question 3
1 / -0

The process by which smaller molecules combine to give a molecule with a higher molecular weight is known as:

A
condensation

B
polymerisation

C
catenation

D
isomerisation

Solution

Polymers are large sized molecules having high molecular weight, built by joining together numerous small sized molecules, also known as monomers. The reaction in which monomers (subunits) combine to form a polymer (macromolecule) is known as polymerization.
Question 4
1 / -0

General formula of alkene is

A
C_nH_2n+2

B
C_nH_2n

C
C_nH_2n−2

D
C_nH_2n+1

Solution

General formula of alkane C_nH_2n+2

General formula of alkene C_nH_2n

General formula of alkyne C_nH_2n−2

General formula of alkyl group C_nH_2n+1
Question 5
1 / -0

Water exists in ........... state(s).

A
one

B
two

C
three

D
four

Solution

Water exists in three states namely solid, liquid and gas in the form of ice, water and vapour.
Question 6
1 / -0

Ethyl bromide and isopropyl chloride can be distinguished by:

A
alcoholic AgNO₃

B
comparing their colours

C
burning the compounds on spatula

D
aqueous KOH solution

Solution

With alcoholic AgNO₃, ethyl bromide gives a light yellow and isopropyl chloride gives white ppt.
Question 7
1 / -0

Carbon is insoluble in:

A
water

B
alcohol

C
oil

D
all of these

Solution

Option (D) is correct.

Carbon is insoluble in any solvent due to its very stable structure and bonds formed.Carbon needs other atoms attached to it to become polar enough to be soluble in water. For example, carbon is insoluble, but carbon dioxide (CO₂) dissolves in water.
Question 8
1 / -0

What should be our mantra to reduce water pollution?

A
Reduce

B
Reuse

C
Recycle

D
All of the above

Solution

Reduce, reuse and recycle should be our mantra to reduce water pollution.
Question 9
1 / -0

Acid dissociation constant is:

A
pH

B
pOH

C
K_a

D
conjugate acid

Solution

Option C is the correct answer.

Acid dissociation constant is denoted by K_a. It gives a measure of the strength of an acid in a solution.
Question 10
1 / -0

The uncertainty in position of an electron is equal to its de Broglie wavelength. The minimum percentage error in its measurement of velocity under this circumstance will be approximately.

A
4

B
8

C
2

D
18

Solution

\(\lambda=\frac{h}{p}\)
Or \(\Delta x=\frac{h}{p}\)
By uncertainty principle \(\Delta x \cdot \Delta p=\frac{h}{4 \pi}\)
or \(\frac{h}{p} \times \Delta p=\frac{h}{4 \pi}\)
\(\frac{\Delta p}{p}=\frac{1}{4 \pi}\)

\(\frac{m \times \Delta v}{m \times v}=\frac{1}{4 \pi}\)
\(\frac{\Delta v}{v}=\frac{1}{4 \pi}\)
\(\%\) uncertainty in velocity \(=\frac{\Delta v}{v} \times 100=\frac{1}{4 \pi} \times 100=8 \%\)

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Chemistry Test - 18

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Chemistry Test - 18

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Question 1

Producer gas

Water gas

Coal gas

Natural gas

Solution

Question 2

10−15cm

10−13cm

10−10cm

10−12cm

Solution

Question 3

condensation

polymerisation

catenation

isomerisation

Solution

Question 4

CnH2n+2

CnH2n

CnH2n−2

CnH2n+1

Solution

Question 5

one

two

three

four

Solution

Question 6

alcoholic AgNO3

comparing their colours

burning the compounds on spatula

aqueous KOH solution

Solution

Question 7

water

alcohol

oil

all of these

Solution

Question 8

Reduce

Reuse

Recycle

All of the above

Solution

Question 9

pH

pOH

Ka

conjugate acid

Solution

Question 10

4

8

2

18

Solution

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10⁻¹⁵cm

10⁻¹³cm

10⁻¹⁰cm

10⁻¹²cm

C_nH_2n+2

C_nH_2n

C_nH_2n−2

C_nH_2n+1

alcoholic AgNO₃

K_a