Chemistry - MOST IMPORTANT UPSC CSE Previous Year Questions
Practice real questions from previous year exams of UPSC CSE.
π Radioactivityπ Applications of Radioactivity
Q1
Which one of the following is used for dating archaeological specimens in wood, bones and shells?
π― UPSC CSE PRE 1993
π Environmental Chemistryπ Acid Rain
Q2
Acid precipitation is now regarded as a serious problem in some European and Asian countries. Its major cause or source is:
π― UPSC CSE PRE 1993
π Solutionπ Colloid and its types
Q3
Which one of the following colloidal systems is represented by fog?
π― UPSC CSE PRE 1993
π Pure Substance- Element-Classification of Matter on the basis of Chemical Properties- IIπ Metalloids
Q4
The Government of India has totally banned the export of βBurnt Coal' (Jhama), because it contains recoverable amount of a metal/element used in transistors. Which one is the element?
π― UPSC CSE PRE 1993
π Phase Changing Processes and Their Factorsπ Freezing
Q5
Assertions (A): A mixture of salt and ice gives temperature below 0Β°C.
Reason (R): The salt raises the freezing point of ice.
In the context of the above two statements, which one of the following is correct?
π― UPSC CSE PRE 1993
π Acids, Bases and Saltsπ Name of Acid present in compounds
Q6
Vinegar is an aqueous solution of:
π― UPSC CSE PRE 1993
π Metallurgyπ Metals and Their Ores
Q7
Monazite is an ore of
π― UPSC CSE PRE 1994
π Corrosionπ Iron Corrosion
Q8
Galvanised iron sheets are protected from rusting due to the presence of a layer of
π― UPSC CSE PRE 1994
π Environmental Chemistryπ Misc
Q9
Which one of the following fuels causes minimum environmental pollution?
π― UPSC CSE PRE 1995
π Chemistry in Everyday Lifeπ Misc
Q10
The chemical used as a 'fixer' in photography is:
π― UPSC CSE PRE 1995
π Polymerπ Misc
Q11
Which one of the following polymers is widely used for making bullet proof material?
π― UPSC CSE PRE 1995
π Chemistry in Everyday Lifeπ Fertilizers
Q12
Which one of the following is a mixed fertilizer?
π― UPSC CSE PRE 1995
π Metallurgyπ Alloys and Their compositions
Q13
Which one of the following statements is alloyed with iron to produce steel which can resist high temperatures and also have high hardness and abrasion resistance?
π― UPSC CSE PRE 1996
π Organic Chemistryπ Misc
Q14
Which one of the following is an active component of oil clove?
π― UPSC CSE PRE 1997
π Pure Substance- Element-Classification of Matter on the basis of Chemical Properties- IIπ Non-metals and its properties
Q15
Which one of the following is paramagnetic in nature?
π― UPSC CSE PRE 1997
π Periodic Propertiesπ Electronegativity
Q16
The most reactive among the halogens is
π― UPSC CSE PRE 1997
π Chemistry in Everyday Lifeπ Misc
Q17
Match List-I with List-II and select the correct answer using the codes given below the lists:
List-I
A. Potassium bromide
B. Potassium nitrate
C. Potassium sulphate
D. Monopotassium Tartarate
List-II
1. Fertilizer
2. Photography
3. Bakery
4. Gun-power
π― UPSC CSE PRE 1998
π Organic Chemistryπ Hydrocarbons
Q18
Consider the following statements about acetylene:
1. It is used in welding industry.
2. It is a raw material for preparing plastics.
3. It is easily obtained by mixing silicon carbide and water.
Of these statements
π― UPSC CSE PRE 1998
π Radioactivityπ Misc
Q19
Which one of the following elements is essential for the construction of nuclear reactors?
π― UPSC CSE PRE 1998
π Pure Substance- Element-Classification of Matter on the basis of Chemical Properties- IIπ Metals and its properties
Q20
Assertion (A): Sodium metal is stored under Kerosene.
Reason (R): Metallic sodium melts when exposed to air.
π― UPSC CSE PRE 1998