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 481 Discuss
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Which of the following elements is a 'metalloid'?

A
sodium
B
germanium
C
chlorine
D
iron

Answer & Explanation

Correct Option: B

Germanium has properties intermediate between those of metals and non-metals.
Question 482 Discuss
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The 'Graham's Law' deals with the:

A
diffusion of gases
B
solubility of gases
C
pressure of gases
D
expansion of gases

Answer & Explanation

Correct Option: A

It states that the rate of diffusion is inversely proportional to the square root of the molar mass of the gas.
Question 483 Discuss
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The 'Specific Conductance' of an electrolyte:

A
increases with dilution
B
decreases with dilution
C
remains constant
D
depends only on temperature

Answer & Explanation

Correct Option: B

Specific conductance (conductivity) decreases with dilution because the number of ions per unit volume decreases.
Question 484 Discuss
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Which of the following is not a 'Radioactive' isotope of carbon?

A
carbon-12
B
carbon-13
C
carbon-14
D
both a and b

Answer & Explanation

Correct Option: D

C-12 and C-13 are stable; C-14 is radioactive and used in radiocarbon dating.
Question 485 Discuss
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What is the 'pH' of gastric juice in the human stomach?

A
1.5 to 3.5
B
7.0 to 7.4
C
8.0 to 9.0
D
12.0 to 14.0

Answer & Explanation

Correct Option: A

Gastric juice is highly acidic due to the presence of Hydrochloric acid (HCl).
Question 486 Discuss
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The 'Bessemer Process' was historically used for the mass production of:

A
aluminum
B
copper
C
steel
D
sodium

Answer & Explanation

Correct Option: C

It was the first inexpensive industrial process for mass-producing steel from molten pig iron.
Question 487 Discuss
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Which of the following is 'Paramagnetic'?

A
co
B
no
C
cn-
D
n2

Answer & Explanation

Correct Option: B

Nitric oxide (NO) has 11 valence electrons, meaning it must have at least one unpaired electron.
Question 488 Discuss
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The 'Activation Energy' of a reaction can be lowered by:

A
increasing temperature
B
adding a catalyst
C
increasing pressure
D
increasing concentration

Answer & Explanation

Correct Option: B

A catalyst provides an alternative pathway with a lower energy barrier.
Question 489 Discuss
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What is the common name of 'Dinitrogen Oxide'?

A
laughing gas
B
teargas
C
water gas
D
producer gas

Answer & Explanation

Correct Option: A

N2O is used as an anesthetic and is known as laughing gas because it induces euphoria.
Question 490 Discuss
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Which of the following 'Ores' is concentrated by froth flotation?

A
hematite
B
bauxite
C
galena
D
cassiterite

Answer & Explanation

Correct Option: C

Froth flotation is used for sulfide ores like Galena (PbS) which are preferentially wetted by oil.
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