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 1 Discuss
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What kind of radiation is absorbed by the ozone layer?

A
Green radiation
B
Infrared radiation
C
Visible radiation
D
Ultraviolet radiation

Answer & Explanation

Correct Option: D

The ozone layer in the stratosphere acts as a shield by absorbing the majority of the sun's harmful high-frequency ultraviolet radiation.
Question 2 Discuss
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Identify the structural formula for magnesium hydroxide.

A
MgOH
B
MgO2
C
Mg2H2
D
Mg(OH)2

Answer & Explanation

Correct Option: D

Magnesium has a valency of +2 and the hydroxide ion has a valency of -1, resulting in the formula Mg(OH)2 to achieve electrical neutrality.
Question 3 Discuss
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Which of the following chemical reactions takes place when quick lime reacts with water?

A
CaO(s) +H2O(I) → Ca+H2(aq)
B
C(s) + O2( g) → CO2( g)
C
CaO(s) +H2O(I) → Ca(OH)2(aq)
D
CH4( g) +2O2( g) → CO2( g)+ 2H2O(g)

Answer & Explanation

Correct Option: C

Quick lime (calcium oxide) reacts vigorously with water to produce slaked lime (calcium hydroxide) in an exothermic combination reaction.
Question 4 Discuss
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Which number is called Avogadro's constant, named after the 19th century scientist Amedeo Avogadro?

A
6.022 × 10^23
B
6.020 × 10^20
C
6.032 × 10^19
D
6.012 × 10^21

Answer & Explanation

Correct Option: A

Avogadro's constant represents the number of constituent particles (usually atoms or molecules) per mole of a substance.
Question 5 Discuss
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'Au' is the symbol for which of the following elements?

A
Gold
B
Zinc
C
Silver
D
Copper

Answer & Explanation

Correct Option: A

The symbol 'Au' for gold is derived from its Latin name 'Aurum', which means 'shining dawn'.
Question 6 Discuss
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Which of the following gases get released when dilute sulphuric acid (H2SO4) reacts with magnesium (Mg) ?

A
SO3
B
SO2
C
O2
D
H2

Answer & Explanation

Correct Option: D

When an active metal like magnesium reacts with a dilute acid, it undergoes a displacement reaction to produce a salt and hydrogen gas.
Question 7 Discuss
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Identify a monoatomic molecule.

A
Helium
B
Oxygen
C
Carbon dioxide
D
Hydrogen

Answer & Explanation

Correct Option: A

Noble gases like Helium exist as single atoms because they have stable, complete outer electron shells.
Question 8 Discuss
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Which of the following is NOT a physical change?

A
Heating of iron rod to red hot
B
Curdling of milk
C
Evaporation of diesel
D
Sublimation of NH4Cl

Answer & Explanation

Correct Option: B

Curdling of milk is a chemical change because it involves the formation of new substances (lactic acid) and cannot be easily reversed.
Question 9 Discuss
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Transition elements are the elements that are found in Groups 3-12 of the modern periodic table, that constitute the ____ block.

A
d-block
B
s-block
C
p-block
D
f-block

Answer & Explanation

Correct Option: A

Transition elements are located in the d-block of the periodic table because their d-orbitals are being progressively filled.
Question 10 Discuss
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How many carbon dioxide and water molecules will be there in the product side, if the following equation is made balanced? C2H5OH+O2 → CO2+H2O

A
3 and 6, respectively
B
1 and 1, respectively
C
2 and 3, respectively
D
3 and 2, respectively

Answer & Explanation

Correct Option: C

The balanced equation is C2H5OH + 3O2 → 2CO2 + 3H2O, showing 2 molecules of carbon dioxide and 3 molecules of water are produced.
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