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

General Science

jkssb chemistry set 1 mcqs

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Practice Questions

504 Total
Question 401 Discuss
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Which of the following is known as 'Glauber's Salt'?

A
na2so4.10h2o
B
mgso4.7h2o
C
caso4.2h2o
D
cuso4.5h2o

Answer & Explanation

Correct Option: A

Sodium sulphate decahydrate is named after Johann Glauber and is used in various industrial processes.
Question 402 Discuss
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The 'Lassaigne's Test' is used to detect:

A
carbon and hydrogen
B
nitrogen, sulfur, and halogens
C
oxygen only
D
metals only

Answer & Explanation

Correct Option: B

Organic compounds are fused with Sodium metal to convert covalently bonded atoms into ionic sodium salts for detection.
Question 403 Discuss
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Which among the following is a 'Broad Spectrum' antibiotic?

A
penicillin g
B
chloramphenicol
C
terpineol
D
aspirin

Answer & Explanation

Correct Option: B

Broad-spectrum antibiotics like Chloramphenicol are effective against a wide range of gram-positive and gram-negative bacteria.
Question 404 Discuss
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The number of 'sigma' and 'pi' bonds in a benzene molecule are:

A
6 sigma, 3 pi
B
12 sigma, 3 pi
C
9 sigma, 3 pi
D
12 sigma, 6 pi

Answer & Explanation

Correct Option: B

Benzene has 6 C-C sigma bonds, 6 C-H sigma bonds, and 3 delocalized pi bonds.
Question 405 Discuss
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Which of the following is used in 'MRI' (Magnetic Resonance Imaging)?

A
ferromagnetic substances
B
paramagnetic substances
C
superconducting magnets
D
radioactive dyes only

Answer & Explanation

Correct Option: C

MRI machines utilize powerful superconducting magnets cooled by liquid helium to generate high magnetic fields.
Question 406 Discuss
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The 'Moseley's Law' relates the frequency of X-rays to the element's:

A
atomic mass
B
atomic number
C
mass number
D
valency

Answer & Explanation

Correct Option: B

Henry Moseley showed that, proving that atomic number is the fundamental property of elements.
Question 407 Discuss
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Which of the following is not a property of 'Hydrophilic' colloids?

A
high stability
B
reversible nature
C
easy coagulation by electrolytes
D
strong affinity for solvent

Answer & Explanation

Correct Option: C

Hydrophilic (solvent-loving) sols are stable and require high concentrations of electrolytes for coagulation.
Question 408 Discuss
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Which gas is used in the 'Acker Process' for producing magnesium?

A
helium
B
argon
C
chlorine
D
neon

Answer & Explanation

Correct Option: C

The electrolysis of fused magnesium chloride involves the production of magnesium and chlorine gas.
Question 409 Discuss
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What is the hybridisation of Phosphorus in 'PCl5'?

A
sp3
B
sp3d
C
sp3d2
D
dsp2

Answer & Explanation

Correct Option: B

PCl5 has 5 bond pairs, resulting in $sp^3d$ hybridisation and a trigonal bipyramidal geometry.
Question 410 Discuss
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Which among the following is the 'Source' of Bio-gas?

A
crude oil
B
natural gas
C
animal and agricultural waste
D
coal

Answer & Explanation

Correct Option: C

Bio-gas is produced by the anaerobic decomposition of organic matter like cow dung and crop residue.
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