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

General Science

jkssb chemistry set 1 mcqs

Download PDF

Topics

jkssb physics set 1 mcqs jkssb chemistry set 1 mcqs jkssb biology set 1 mcqs

Practice Questions

504 Total
Question 361 Discuss
Ask a Friend

The bond angle in a water molecule is approximately 104.5 degrees instead of 109.5 degrees due to:

A
lone pair-lone pair repulsion
B
bond pair-bond pair repulsion
C
high electronegativity of oxygen
D
hydrogen bonding

Answer & Explanation

Correct Option: A

According to VSEPR theory, lone pair-lone pair repulsion is stronger than bond pair repulsion, compressing the H-O-H angle.
Question 362 Discuss
Ask a Friend

Which of the following is a 'Pseudo-solid'?

A
caesium chloride
B
glass
C
rock salt
D
diamond

Answer & Explanation

Correct Option: B

Amorphous solids like glass are called pseudo-solids or supercooled liquids because they lack a definite crystalline structure.
Question 363 Discuss
Ask a Friend

The 'Cracking' process in the petroleum industry is used to convert:

A
alkanes to alcohols
B
heavy molecular weight fractions to light fractions
C
light fractions to heavy fractions
D
petrol to diesel

Answer & Explanation

Correct Option: B

Cracking breaks down large hydrocarbon molecules into smaller, more useful ones like gasoline.
Question 364 Discuss
Ask a Friend

Which law states that the total pressure exerted by a mixture of non-reacting gases is equal to the sum of partial pressures?

A
graham's law
B
dalton's law
C
raoult's law
D
henry's law

Answer & Explanation

Correct Option: B

Dalton's Law of Partial Pressures applies to ideal gas mixtures that do not chemically react with each other.
Question 365 Discuss
Ask a Friend

What is the bond order of the Oxygen molecule (O2)?

A
1
B
2
C
3
D
1.5

Answer & Explanation

Correct Option: B

Oxygen has a double bond between its atoms, resulting in a bond order of 2.
Question 366 Discuss
Ask a Friend

Which of the following is used as an 'anti-knocking' agent in gasoline?

A
tetraethyl lead
B
ethyl alcohol
C
methyl benzene
D
glycol

Answer & Explanation

Correct Option: A

Tetraethyl lead (TEL) was widely used to improve octane ratings, though it is being phased out for environmental reasons.
Question 367 Discuss
Ask a Friend

The internal energy (U) of an ideal gas depends only on its:

A
pressure
B
volume
C
temperature
D
molecular size

Answer & Explanation

Correct Option: C

According to Joule's Law, the internal energy of an ideal gas is a function of temperature alone.
Question 368 Discuss
Ask a Friend

Which substance is used to absorb carbon dioxide in a laboratory?

A
dilute hcl
B
potassium hydroxide solution
C
concentrated sulphuric acid
D
calcium carbonate

Answer & Explanation

Correct Option: B

KOH reacts with CO2 to form potassium carbonate and water, making it an excellent absorbent for the gas.
Question 369 Discuss
Ask a Friend

The 'Half-Life' of a first-order reaction is:

A
inversely proportional to initial concentration
B
directly proportional to initial concentration
C
independent of initial concentration
D
square of initial concentration

Answer & Explanation

Correct Option: C

For first-order reactions, $t_{1/2} = 0.693/k$, which does not include the concentration term.
Question 370 Discuss
Ask a Friend

Which of the following elements shows the property of 'maximum catenation'?

A
silicon
B
germanium
C
carbon
D
sulfur

Answer & Explanation

Correct Option: C

Carbon has the strongest C-C bond energy, allowing it to form long stable chains and rings.
Previous Next