Chemistry Test

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Chemistry Test - 20

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following complex has five unpaired electrons?

A
[Mn(H₂O)₆]²⁺

B
[Mn(CN)₆]³⁻

C
[CrCl₃(H₂O₃]

D
[Ag(NH₃)₂]⁺

Solution

Mn²⁺ has d⁵ configuration, since H₂O is weak ligand field, so it does not causes pairing of electrons and hence it has 5 unpaired electrons.
Question 2
1 / -0

x% Oleum in water is treated with 0.5l of 2.75 M Ca(OH)₂ solution. The resulting solution required 15.7 gm of H₃PO₃ (Assume strong acid) solution for complete neutralization. Calculate the amount of free SO₃ in 100 gms of oleum

A
7.111gm

B
0.7111gm

C
71.11 gm

D
None of these

Solution
Question 3
1 / -0

Iodine, camphor, ammonium chloride and naphthalene. Name the property that is common to all these substances.

A
Equal densities

B
Sublimation property

C
Equal melting points

D
Pure homogeneous mixtures

Solution

They all usually change their state from solid to gas phase either at room temperature or at heating.

Thus all of them sublimate.
Question 4
1 / -0

Which of the following hormone controls the metabolism of glucose and maintains glucose level in the blood?

A
Insulin

B
Cortisone

C
Oxytocin

D
Estrogens

Solution

Insulin controls the metabolism of glucose and maintains glucose level in the blood. Insulin is a peptide hormone and is secreted in pancreas.
Question 5
1 / -0

The chemical method used in the concentration of ore is also known as:

A
Bleaching

B
Leaching

C
Roasting

D
Calcination

Solution

Chemical method used in concentration of ore is also known as Leaching.
Question 6
1 / -0

Find the organic structure designation that includes the functional group of an aldehyde:

(∗∗ Alkyl group that is not necessarily the same as R)

A
R−OH

B
R−O−R∗

C

D
RCHO

Solution

Aldehyde functional group can be represented by RCHO.

Thus option D is the correct.
Question 7
1 / -0

Which of the following represents non-renewable sources of energy.

A
Fossil fuels

B
Wind energy

C
Solar energy

D
Hydro power plant

Solution

Fossil fuels represents non-renewable sources of energy. Wind energy, solar energy and hydro power plant represents renewable sources of energy.
Question 8
1 / -0

Which pressure is NOT standard pressure?

A
750 torr

B
0.987 atm

C
100 kPa

D
70 mm Hg

Solution
Question 9
1 / -0

Reaction of aniline with NaNO₂ + dil. HCl at 0^∘C followed by reaction with CuCN yields.

A
I

B
II

C
III

D
IV

Solution
Question 10
1 / -0

Which layer protects us from harmful ultraviolet rays of the sun?

A
First layer

B
Second layer

C
Ozone layer

D
Exosphere

Solution

The ozone layer protects us from harmful ultraviolet rays of the sun.