Chemistry - MOST IMPORTANT CG PCS Previous Year Questions
Practice real questions from previous year exams of CG PCS.
📘 Electron Configuration📚 Valency
Q1
Correctly match the following: List I (Elements): A. Silicon, B. Fluorine, C. Aluminium, D. Sulphur. List II (Valency): 1. 1, 2. 2, 3. 3, 4. 4.
🎯 CG PCS (Pre) 2022
📘 Carbon Allotropes📚 Carbon Allotrope (Crystalline)
Q2
Graphite and diamonds are basically made up of atoms of
🎯 CG PCS (Pre) 2023
📘 Phase Changing Processes and Their Factors📚 Melting
Q3
Arrange the following carbon compounds in the decreasing order of their melting points:
🎯 CG PCS (Pre) 2022
📘 Carbon Allotropes📚 Carbon Allotrope (Crystalline)
Q4
Which one among the following is used in making lead pencils?
🎯 CG PCS (Pre) G.S. 2010-11
📘 Organic Chemistry📚 Other functional groups
Q5
The characteristic odour of garlic is due to:
🎯 CG PCS (Pre) G.S. 2004-05
📘 Chemistry in Everyday Life📚 Misc
Q6
Consider the following statements and choose the right options given below.
(1) Fuel obtained from plastic waste has low octane rating.
(2) Lower the octane number, more is the ability of the fuel to withstand compression without detonating.
🎯 CG PCS (Pre) 2023
📘 Chemistry in Everyday Life📚 Common Gases used in daily life (LPG, CNG, etc.)
Q7
Consider the following reaction:
$CH_4(g) + H_2O(g) \xrightarrow{1270K} CO(g) + 3H_2(g)$
In the reaction given above, the mixture of CO and $H_2$ is:
🎯 CG PCS (Pre) 2016-17
📘 Chemistry in Everyday Life📚 Common Gases used in daily life (LPG, CNG, etc.)
Q8
Which of the following is the main component of the natural gas?
🎯 CG PCS (Pre) 2016-17
📘 Chemistry in Everyday Life📚 Misc
Q9
Which one is not a fossil fuel?
🎯 CG PCS (Pre) Ist G.S., 2014
📘 Radioactivity📚 Nuclear Fission
Q10
Which is not used as nuclear fuel?
🎯 CG PCS (Pre) Ist G.S., 2014
📘 Organic Chemistry📚 Alcohol
Q11
Molasses is the best raw material for:
🎯 CG PCS (Pre) G.S. 2004-05
📘 Chemistry in Everyday Life📚 Medicines (Antacids, Analgesics, etc.)
Q12
Which one of the following is stimulating?
🎯 CG PCS (Pre) G.S., 2003
📘 Catalyst📚 General Facts and Properties
Q13
Which of the following metals are used as catalyst in the Catalytic converters to eliminate poisonous gases?
🎯 CG PCS (Pre) 2023
📘 Physical States of Matter and Their properties📚 Gas
Q14
In which of the following conditions distance between molecules of carbon dioxide filled in a container may increase? i. On increasing the volume of container, ii. On leakage of some carbon dioxide gas from the container, iii. On increasing air pressure in the container, iv. On adding more carbon dioxide gas in container without changing its size
🎯 CG PCS (Pre) 2021
📘 Corrosion📚 Silver Corrosion
Q15
Example of chemical change corrosion is:
🎯 CG PCS (Pre) 2016-17
📘 Acids, Bases and Salts📚 pH Scale
Q16
Which of the following soil has the lowest pH value?
🎯 CG PCS (Pre) 2024
📘 Chemistry in Everyday Life📚 Medicines (Antacids, Analgesics, etc.)
Q17
Antacids are :
🎯 CG PCS (Pre) 2016-17
📘 Environmental Chemistry📚 Acid Rain
Q18
'Acid rain' consists of the following:
🎯 CG PCS (Pre) 2020
📘 Acids, Bases and Salts📚 pH Scale
Q19
A solution turns red litmus to blue; pH value of solution is:
🎯 CG PCS (Pre) 1st G.S., 2014
📘 Radioactivity📚 General Facts
Q20
The ultimate product of radioactive disintegration of uranium is
🎯 CG PCS (Pre) Ist G.S., 2013