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 21 Discuss
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According to Mendeleev's Periodic Table, which elements' properties matched up remarkably well with ekasilicon?

A
Gallium
B
Scandium
C
Titanium
D
Germanium

Answer & Explanation

Correct Option: D

Mendeleev predicted the existence of Germanium, calling it 'ekasilicon', and its discovery later confirmed his periodic laws.
Question 22 Discuss
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Which of the following is a crystalline form of carbon used in nanotechnology?

A
Graphene
B
Lonsdaleite
C
Carbophene
D
Fullerene

Answer & Explanation

Correct Option: D

Fullerenes are cage-like carbon molecules, such as C60, which have unique properties utilized in medicine and material science.
Question 23 Discuss
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Why does the milkman add a very small amount of baking soda to fresh milk?

A
To reduce the pH of the fresh milk from 6 to slightly more acidic
B
To increase the pH of the fresh milk from 6 to slightly alkaline
C
To maintain the pH of the fresh milk at 6 for a longer time
D
To reduce the pH of the fresh milk from 6 to slightly alkaline

Answer & Explanation

Correct Option: B

Baking soda is alkaline and helps neutralize the lactic acid produced by bacteria, preventing the milk from souring too quickly.
Question 24 Discuss
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Who is credited with the hypothesis that equal volumes of gases at the same temperature and pressure contain equal numbers of molecules?

A
Robert Boyle
B
Amadeo Avogadro
C
Fred Hoyle
D
Jacques Charles

Answer & Explanation

Correct Option: B

Amadeo Avogadro proposed this fundamental principle in 1811, which helped distinguish between atoms and molecules.
Question 25 Discuss
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The principle that mass is neither created nor destroyed in a chemical reaction is known as the:

A
Law of Conservation of Mass
B
Law of Multiple Proportions
C
Law of Definite Proportions
D
Law of Conservation of Energy

Answer & Explanation

Correct Option: A

Formulated by Antoine Lavoisier in the late 18th century, this law states that the total mass of reactants equals the total mass of products.
Question 26 Discuss
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In a chemical reaction, if the concentration of a reactant is doubled, the rate of reaction remains unchanged. The order of the reaction is:

A
Second
B
First
C
Zero
D
Half

Answer & Explanation

Correct Option: C

In zero-order reactions, the rate of reaction is independent of the concentration of the reactants.
Question 27 Discuss
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Who first stated the principle of refraction that postulates that every substance has a specific bending ratio 'refractive index'?

A
Dennis Gabor
B
Thomas Young
C
Willebrord Snellius
D
David Brewster

Answer & Explanation

Correct Option: C

Willebrord Snellius discovered the law of refraction, now known as Snell's Law, in 1621 to describe how light bends across different media.
Question 28 Discuss
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The breakdown of rocks through processes that change their chemical composition is called:

A
physical weathering
B
chemical weathering
C
mass wasting
D
biochemical weathering

Answer & Explanation

Correct Option: B

Chemical weathering involves the decomposition of minerals through chemical reactions like oxidation, hydrolysis, and carbonation.
Question 29 Discuss
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When haloalkanes and aryl and vinyl halides react with magnesium metal they yield which reagent?

A
Hinsberg reagent
B
Grignard reagent
C
Tollens' reagent
D
Fehling reagent

Answer & Explanation

Correct Option: B

Victor Grignard discovered these organomagnesium compounds in 1900, which are vital for forming new carbon-carbon bonds.
Question 30 Discuss
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Who developed the theory of combustion as a process of combining with oxygen?

A
Antoine Lavoisier
B
Robert Boyle
C
Friedrich Wöhler
D
Johann Becher

Answer & Explanation

Correct Option: A

Lavoisier disproved the phlogiston theory by demonstrating that combustion is a chemical reaction involving oxygen.
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