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 71 Discuss
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What is the chemical formula for sodium bicarbonate?

A
Na2CO3
B
NaOH
C
NaCl
D
NaHCO3

Answer & Explanation

Correct Option: D

Sodium bicarbonate (NaHCO3), commonly known as baking soda, is a salt composed of a sodium cation and a bicarbonate anion.
Question 72 Discuss
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Which element is located in Group 18 of the periodic table and is known for its lack of chemical reactivity?

A
Chlorine
B
Fluorine
C
Helium
D
Oxygen

Answer & Explanation

Correct Option: C

Group 18 elements are the noble gases; they are chemically inert because they have a stable, full valence shell of electrons.
Question 73 Discuss
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Metals are often described as having which two physical properties?

A
Malleability and sonorous
B
Ductility and lustre
C
Malleability and lustre
D
Lustre and sonorous

Answer & Explanation

Correct Option: C

Malleability allows metals to be hammered into sheets, while lustre refers to their characteristic shiny appearance when polished.
Question 74 Discuss
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What is the theoretical state where the particles of a substance have minimum motion?

A
freezing point of water
B
zero-point energy
C
standard temperature
D
absolute zero temperature

Answer & Explanation

Correct Option: D

Absolute zero (0 Kelvin) is the lowest possible temperature where the thermal motion of atoms theoretically reaches its minimum.
Question 75 Discuss
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Select the imbalanced chemical equation from the following.

A
10KClO3 +3P4 → 3P4O10 +10KCl
B
3CaCl2 + 2Na3PO4 → Ca3(PO4)2 + 6NaCl
C
6HClO4 +P4O10 → 4H3PO4 +6Cl2O7
D
3Hg(OH)2 +2H3PO4 → Hg3(PO4)2 +6H2O

Answer & Explanation

Correct Option: C

In equation C, the number of phosphorus and hydrogen atoms are not equal on both sides, requiring coefficients to satisfy the law of conservation of mass.
Question 76 Discuss
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Select the INCORRECT statement regarding Ozone.

A
Ozone is a deadly poison
B
Ozone(O_3),like oxygen,is a life supporting gas
C
Ultraviolet radiation causes skin cancer
D
Ozone is formed from oxygen in the presence of ultraviolet radiation.

Answer & Explanation

Correct Option: B

While ozone protects the Earth in the upper atmosphere, it is a toxic pollutant and a strong oxidant at ground level.
Question 77 Discuss
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What is the chemical formula for the compound commonly known as 'laughing gas'?

A
NO
B
N2O3
C
N2O
D
NO2

Answer & Explanation

Correct Option: C

Nitrous oxide (N2O) is referred to as laughing gas due to the euphoric effects it produces when inhaled.
Question 78 Discuss
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What is the primary gas responsible for the leavening effect in bread when yeast ferments sugars?

A
Carbon dioxide
B
Oxygen
C
Nitrogen
D
Helium

Answer & Explanation

Correct Option: A

During fermentation, yeast consumes sugars and releases carbon dioxide gas, which gets trapped in the dough and causes it to rise.
Question 79 Discuss
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Below are two chemical equations: Zn(s) +CuSO4(aq) →ZnSO4(aq)+Cu(s) Pb(s) +CuCl2(aq) → PbCl2(aq)+ Cu(s) Why does copper get separated from its compound form in both the cases?

A
Zinc and Lead are unstable in element form.
B
Zinc and Lead are more reactive than Copper.
C
Copper compounds break down under high pressure.
D
Copper is more reactive than Zinc and Lead.

Answer & Explanation

Correct Option: B

In the reactivity series, more active metals like zinc and lead can displace less active metals like copper from their salt solutions.
Question 80 Discuss
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JJ Thomson is known for developing which model in 1898?

A
Plum pudding model
B
Double-slit model
C
Gold foil model
D
Oil drop model

Answer & Explanation

Correct Option: A

Thomson's model suggested that atoms were spheres of positive charge with negatively charged electrons embedded in them, like plums in a pudding.
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