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Chemistry - MOST IMPORTANT UPPSC RO/ARO Previous Year Questions

Practice real questions from previous year exams of UPPSC RO/ARO.

📘 Phase Changing Processes and Their Factors📚 Boiling or Vaporization

Q1

Given below are two statements, in which one is labelled as Assertion (A) and other as Reason (R) :
Assertion (A): The boiling point of water decreases as the altitude increases.
Reason (R): The atmospheric pressure increases with altitude.

🎯 UPPSC RO/ARO (Pre) Nirsat Exam-2023

A.

(A) is true but (R) is false.

B.

(A) is false but (R) is true.

C.

Both (A) and (R) are true and (R) is correct explanation of (A).

D.

Both (A) and (R) are true but (R) is not correct explanation of (A).

📘 Structure of Atom📚 Electron

Q2

Consider the following events and arrange them in correct chronological order starting from the earliest to the last activity :
I. Discovery of pi meson
II. Discovery of Neutron
III. Discovery of Electron
IV. Discovery of Proton

🎯 UPPSC RO/ARO (Pre) Nirsat Exam-2023

A.

I, III, IV, II

B.

III, II, I, IV

C.

III, IV, II, I

D.

III, IV, I, II

📘 Solution📚 Misc

Q3

Consider the following statements with reference to osmosis :

If the semi permeable membrane is placed between the solvent and solution, the solvent molecules will flow through the membrane from pure solvent to the solution.
The process of flow of solvent is called as reverse osmosis.

🎯 UPPSC RO/ARO (Pre) Nirsat Exam-2023

A.

Both $\displaystyle 1$ and $\displaystyle 2$

B.

Only $\displaystyle 1$

C.

Neither $\displaystyle 1$ nor $\displaystyle 2$

D.

Only $\displaystyle 2$

📘 Chemistry in Everyday Life📚 Misc

Q4

Match List-I with List-II and choose the correct answer using the code given below
List-I
A. Vitamin-C
B. Folic Acid
C. Vitamin-A
D. Vitamin-B1
List-II

Night blindness
Beri-Beri
Anemia
Scurvy

🎯 UPPSC RO/ARO (Pre) Nirsat Exam-2023

A.

A- $\displaystyle 1$ , B- $\displaystyle 2$ , C- $\displaystyle 4$ , D- $\displaystyle 3$

B.

A- $\displaystyle 4$ , B- $\displaystyle 3$ , C- $\displaystyle 1$ , D- $\displaystyle 2$

C.

A- $\displaystyle 4$ , B- $\displaystyle 3$ , C- $\displaystyle 2$ , D- $\displaystyle 1$

D.

A- $\displaystyle 2$ , B- $\displaystyle 3$ , C- $\displaystyle 1$ , D- $\displaystyle 4$

📘 Acids, Bases and Salts📚 Physical Properties of Salt

Q5

Given below are two statements, in which one is labelled as Assertion (A) and other as Reason (R) :
Assertion (A): Saline soils in India are not appropriate for cultivation of crops.
Reason (R): Saline soils have high proportion of salt, largely because of dry climate and poor drainage.

🎯 UPPSC RO/ARO (Pre) Nirsat Exam-2023

A.

Both (A) and (R) are true but (R) is not correct explanation of (A).

B.

(A) is false but (R) is true.

C.

(A) is true but (R) is false.

D.

Both (A) and (R) are true and (R) is correct explanation of (A).

📘 Environmental Chemistry📚 Water Pollutants

Q6

The cause of 'Minamata' disease is –

🎯 UPPSC RO/ARO (Pre) Nirsat Exam-2023

A.

Cadmium polluted water

B.

Lead polluted water

C.

Mercury polluted water

D.

Chromium polluted water

📘 Pure Substance- Element-Classification of Matter on the basis of Chemical Properties- II📚 Misc

Q7

Which one of the following Payloads was used in Chandrayaan-3 Mission to determine the elemental composition (Mg, Al, Si, K, Ca, Ti, Fe) of lunar soil and rocks around the lunar landing site?

🎯 UPPSC RO/ARO (Pre) Nirsat Exam-2023

A.

ILSA

B.

LRA

C.

APXS

D.

None of the above

📘 Environmental Chemistry📚 Misc

Q8

Given below are two statements, in which one is labelled as Assertion (A) and the other as Reason (R) :
Assertion (A): The colour of Red Soil is due to the wide diffusion of iron rather than to a high proportion of it.
Reason (R): They are generally poor in nitrogen, phosphorous and humus.

🎯 UPPSC RO/ARO (Pre) Nirsat Exam-2023

A.

Both (A) and (R) are true and (R) is correct explanation of (A).

B.

(A) is false but (R) is true.

C.

(A) is true but (R) is false.

D.

Both (A) and (R) are true but (R) is not correct explanation of (A).

📘 Important Chemical Compounds📚 Bleaching Powder

Q9

Which one of the following pairs is not correctly matched?

🎯 UPPSC RO/ARO (Mains) Exam-2021

A.

Bleaching powder - Calcium oxychloride

B.

Plaster of Paris - Calcium bicarbonate

C.

Washing Powder - Sodium carbonate

D.

Baking Soda - Sodium bicarbonate

📘 Environmental Chemistry📚 Air Pollutants

Q10

'Ringelmann Scale' is used to measure the density of the following-

🎯 UPPSC RO/ARO (Mains) Exam-2021

A.

fog

B.

noise

C.

polluted water

D.

smoke

📘 Environmental Chemistry📚 Ozone Depletion

Q11

Which one among the following is measured by Dobson unit?

🎯 UPPSC RO/ARO (Mains) Exam-2021

A.

Ozone concentration

B.

Thermal conductivity

C.

Soil moisture

D.

Radiation

📘 Organic Chemistry📚 Misc

Q12

Match List-I with List-II and select the correct answer.
List-I
A. Vitamin
B. Enzyme
C. Hormone
D. Protein
List-II

Pepsin
Carotene
Keratin
Progesterone

🎯 UPPSC RO/ARO (Mains) Exam-2021

A.

A- $\displaystyle 1$ , B- $\displaystyle 2$ , C- $\displaystyle 3$ , D- $\displaystyle 4$

B.

A- $\displaystyle 1$ , B- $\displaystyle 2$ , C- $\displaystyle 4$ , D- $\displaystyle 3$

C.

A- $\displaystyle 2$ , B- $\displaystyle 1$ , C- $\displaystyle 3$ , D- $\displaystyle 4$

D.

A- $\displaystyle 2$ , B- $\displaystyle 1$ , C- $\displaystyle 4$ , D- $\displaystyle 3$

📘 Organic Chemistry📚 Misc

Q13

What is cholesterol among the following?

🎯 UPPSC RO/ARO (Mains) Exam-2021

A.

Steroid

B.

Vitamin

C.

Enzyme

D.

Insecticide

📘 Polymer📚 Polythene

Q14

Which one of the following gases is used in manufacturing of polythene?

🎯 UPPSC RO/ARO (Mains) Exam-2021

A.

Ethylene

B.

Carbon-di-oxide

C.

Nitrogen

D.

Carbon monoxide

📘 Chemistry in Everyday Life📚 Medicines (Antacids, Analgesics, etc.)

Q15

Tulsi plant has medicinal values due to the presence of the following-

🎯 UPPSC RO/ARO (Pre) Exam-2021

A.

Inorganic Acid

B.

Organic Acid

C.

Phenols and Flavonoids

D.

Lithium Bicarbonate

📘 Environmental Chemistry📚 Air Pollutants

Q16

The chief source of Hydrogen Sulphide pollutant is-

🎯 UPPSC RO/ARO (Pre) Exam 2021

A.

Decaying vegetation and animal matter

B.

Automobiles

C.

Oil Refineries

D.

Thermal Power plants

📘 Environmental Chemistry📚 Water Pollutants

Q17

Water Pollution of river is measured by-

🎯 UPPSC RO/ARO (Pre) Exam 2021

A.

Amount of Chlorine dissolved in water

B.

Amount of Ozone dissolved in water

C.

Amount of Nitrogen dissolved in water

D.

Amount of Oxygen dissolved in water

📘 Chemistry in Everyday Life📚 Common Gases used in daily life (LPG, CNG, etc.)

Q18

Which of the following is related to Brent Index?

🎯 UPPSC RO/ARO (Pre) Exam 2021

A.

Crude oil prices

B.

Copper future Prices

C.

Gold future prices

D.

Shipping rate Index

📘 Organic Chemistry📚 Misc

Q19

How is liver affected on fasting for more than 10 day?

🎯 UPPSC RO/ARO (Pre) Exam 2021

A.

Glucose level in liver diminished

B.

Glucose Level in liver increases

C.

In liver triglycerides decrease

D.

In liver triglycerides increase

📘 Organic Chemistry📚 Other functional groups

Q20

Which of the following pair/s is/are correctly matched?
(1) Beet - Sugar
(2) Honey - Glucose and Fructose
(3) Cotton - Cellulose
(4) Milk - Lactose

🎯 UPPSC RO/ARO (Pre) Exam 2021

A.

Only ( $\displaystyle 1$ ), ( $\displaystyle 2$ ) and ( $\displaystyle 3$ )

B.

Only ( $\displaystyle 2$ ), ( $\displaystyle 3$ ) and ( $\displaystyle 4$ )

C.

Only ( $\displaystyle 1$ ), ( $\displaystyle 2$ ) and ( $\displaystyle 4$ )

D.

( $\displaystyle 1$ ), ( $\displaystyle 2$ ), ( $\displaystyle 3$ ) and ( $\displaystyle 4$ )

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