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 371 Discuss
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The 'Aqua Regia' is a mixture of concentrated HCl and concentrated HNO3 in the ratio:

A
1:3
B
3:1
C
2:1
D
1:2

Answer & Explanation

Correct Option: B

Aqua Regia (Royal Water) consists of 3 parts HCl and 1 part HNO3; it can dissolve gold and platinum.
Question 372 Discuss
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Which of the following is an example of an 'efflorescent' substance?

A
washing soda
B
common salt
C
anhydrous calcium chloride
D
concentrated sulphuric acid

Answer & Explanation

Correct Option: A

Efflorescent substances lose their water of crystallization when exposed to dry air.
Question 373 Discuss
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Which of the following is the most acidic oxide?

A
na2o
B
mgo
C
al2o3
D
p4o10

Answer & Explanation

Correct Option: D

Acidity of oxides increases across the periodic table; Phosphorus pentoxide is a strong acidic oxide.
Question 374 Discuss
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Which among the following is an 'electrophile'?

A
nh3
B
h2o
C
bf3
D
cn-

Answer & Explanation

Correct Option: C

BF3 is electron-deficient (incomplete octet), making it an electron-loving species or electrophile.
Question 375 Discuss
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Which process is used for the purification of 'Bauxite' ore?

A
baeyer's process
B
froth flotation
C
magnetic separation
D
liquation

Answer & Explanation

Correct Option: A

Baeyer's process involves leaching bauxite with hot sodium hydroxide to separate alumina from impurities.
Question 376 Discuss
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The temperature at which a real gas behaves like an ideal gas over an appreciable range of pressure is called:

A
critical temperature
B
boyle temperature
C
inversion temperature
D
absolute zero

Answer & Explanation

Correct Option: B

At Boyle temperature, the attractive and repulsive forces between gas molecules balance out.
Question 377 Discuss
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Which of the following contains the highest percentage of Nitrogen?

A
urea
B
ammonium sulphate
C
calcium nitrate
D
potassium nitrate

Answer & Explanation

Correct Option: A

Urea (NH2CONH2) contains approximately 46% nitrogen by mass, making it a concentrated fertilizer.
Question 378 Discuss
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What is the shape of the 'SF6' molecule?

A
tetrahedral
B
trigonal bipyramidal
C
octahedral
D
hexagonal

Answer & Explanation

Correct Option: C

SF6 has 6 bond pairs and 0 lone pairs, leading to an $sp^3d^2$ hybridisation and octahedral geometry.
Question 379 Discuss
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Which of the following is an 'Isotope' of Hydrogen that is radioactive?

A
protium
B
deuterium
C
tritium
D
ortho-hydrogen

Answer & Explanation

Correct Option: C

Tritium (T) emits low-energy beta particles and has a half-life of about 12.3 years.
Question 380 Discuss
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The 'Octane Number' of a fuel is a measure of its:

A
ignitability
B
resistance to knocking
C
viscosity
D
calorific value

Answer & Explanation

Correct Option: B

Higher octane numbers indicate better resistance to premature combustion (knocking) in spark-ignition engines.
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