General Science Jkssb Chemistry Set 1 Mcqs (504 MCQs) | JKSSB & SSC Quiz

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jkssb chemistry set 1 mcqs

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Practice Questions

504 Total
Question 431 Discuss
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The 'Brownian Movement' of colloidal particles is caused by:

A
convection currents
B
unbalanced bombardment by solvent molecules
C
electrical charge on particles
D
gravity

Answer & Explanation

Correct Option: B

Random collisions with fast-moving solvent molecules cause the zig-zag motion of dispersed particles.
Question 432 Discuss
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Which of the following is used as an 'antidote' for lead poisoning?

A
edta
B
aspirin
C
charcoal
D
magnesium sulphate

Answer & Explanation

Correct Option: A

EDTA acts as a chelating agent, binding to lead ions to form a soluble complex excreted by kidneys.
Question 433 Discuss
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The 'Bond Angle' in a water molecule is approximately:

A
109.5
B
120
C
104.5
D
180

Answer & Explanation

Correct Option: C

Bent shape of water due to two lone pairs reduces the tetrahedral angle to 104.5 degrees.
Question 434 Discuss
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Which of the following 'Halogens' is a solid at room temperature?

A
fluorine
B
chlorine
C
bromine
D
iodine

Answer & Explanation

Correct Option: D

Iodine has high molecular weight and strong Van der Waals forces, making it solid.
Question 435 Discuss
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Which among the following is used as a 'Refrigerant' that is ozone-friendly?

A
cfcs
B
hfcs
C
carbon tetrachloride
D
halons

Answer & Explanation

Correct Option: B

Hydrofluorocarbons (HFCs) do not contain Chlorine and thus do not deplete the ozone layer.
Question 436 Discuss
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The 'Common Ion Effect' describes the:

A
increase in solubility
B
suppression of dissociation of a weak electrolyte
C
increase in degree of ionization
D
formation of a complex ion

Answer & Explanation

Correct Option: B

Adding an ion already present in a weak electrolyte solution shifts equilibrium to the left.
Question 437 Discuss
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Which of the following has the highest 'Boiling Point'?

A
hf
B
hcl
C
hbr
D
hi

Answer & Explanation

Correct Option: A

HF exhibits strong intermolecular hydrogen bonding, significantly raising its boiling point compared to other hydracids.
Question 438 Discuss
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The 'Gold Foil' experiment led to the conclusion that:

A
electrons revolve in orbits
B
most of the atom is empty space
C
protons are in the nucleus
D
neutrons exist in the nucleus

Answer & Explanation

Correct Option: B

Rutherford observed most alpha particles passed through the foil undeflected, indicating an empty atomic structure.
Question 439 Discuss
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Which chemical is used to remove 'Permanent Hardness' of water?

A
slaked lime
B
washing soda
C
baking soda
D
bleaching powder

Answer & Explanation

Correct Option: B

Washing soda reacts with soluble chlorides/sulphates of Ca and Mg to form insoluble carbonates.
Question 440 Discuss
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The 'Isomerism' shown by compounds having the same molecular formula but different functional groups is:

A
chain isomerism
B
position isomerism
C
functional isomerism
D
metamerism

Answer & Explanation

Correct Option: C

Example: Ethanol and Dimethyl ether both have the formula C2H6O but different groups.
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