Chemistry Previous Year Questions 2026 | Allahabad HC ARO

Chemistry - MOST IMPORTANT Allahabad HC ARO Previous Year Questions

Practice real questions from previous year exams of Allahabad HC ARO.

📘 Classification of Matter on the basis of Chemical Properties- I📚 Mixture (Impure substance)- Homogeneous and Heterogeneous
Q1

Liquids that form separate layers and do not mix are known as ___ .

🎯 Allahabad HC ARO 19/12/2021 Shift-II
📘 Separation of Mixtures📚 Sublimation
Q2

Camphor is purified by the process of :

🎯 Allahabad HC RO/ARO Exam-28/09/2014
📘 Structure of Atom📚 Electron
Q3

J.J. Thomson was awarded the "Nobel Prize" in physics in 1906 for the discovery of:

🎯 Allahabad HC ARO 15/12/2021 Shift-I
📘 Periodic Properties📚 Atomic Radius
Q4

The term atomic size refers to:

🎯 Allahabad HC ARO 19/12/2021 Shift-II
📘 Structure of Atom📚 Neutron
Q5

Neutron ______ .

🎯 Allahabad HC ARO 19/12/2021 Shift-II
📘 Structure of Atom📚 Isotopes
Q6

Which one of the following is not an isotope of hydrogen?

🎯 Allahabad HC ARO 15/12/2021 Shift-I
📘 Structure of Atom📚 Isotopes
Q7

Which of the following statement is incorrect about isotopes?

🎯 Allahabad HC ARO 19/12/2021 Shift-I
📘 Structure of Atom📚 Isobar
Q8

Which one of the following pairs are isobars ?

🎯 Allahabad HC ARO 20/12/2021 Shift-I
📘 Matter in Our Surroundings📚 General Facts
Q9

Which of the following sets of phenomena would increase on raising the temperature?

🎯 Allahabad HC RO/ARO Exam-28/09/2014
📘 Radioactivity📚 Applications of Radioactivity
Q10

In the following, which one is used to date the archaeological remains of wood, bone and shell?

🎯 Allahabad HC ARO 16/12/2021 Shift-I
📘 Radioactivity📚 Applications of Radioactivity
Q11

Which isotope is used in the nuclear power plants to generate electricity ?

🎯 Allahabad HC ARO 20/12/2021 Shift-I
📘 Electron Configuration📚 Valency
Q12

How many valence electrons are present in a sodium atom ?

🎯 Allahabad HC ARO 15/12/2021 Shift-I
📘 Electron Configuration📚 Valency
Q13

The combining capacity of an element is called

🎯 Allahabad HC ARO 19/12/2021 Shift-I
📘 Acids, Bases and Salts📚 Chemical Properties of Acids
Q14

Concentrated Nitric acid is an example of ___.

🎯 Allahabad HC ARO 19/12/2021 Shift-II
📘 Chemistry in Everyday Life📚 Medicines (Antacids, Analgesics, etc.)
Q15

Chemically antacids are ‐

🎯 Allahabad HC ARO 20/12/2021 Shift-I
📘 Chemistry in Everyday Life📚 Medicines (Antacids, Analgesics, etc.)
Q16

Which of the following types of medicines is used for treating indigestion?

🎯 Allahabad HC ARO 19/12/2021 Shift-II
📘 Important Chemical Compounds📚 Baking Soda
Q17

Which of the following is an example of a mild non‐corrosive basic salt?

🎯 Allahabad HC ARO 20/12/2021 Shift-I
📘 Acids, Bases and Salts📚 Physical Properties of Salt
Q18

The chemical name of common salt is :

🎯 Allahabad HC RO/ARO Exam-06/02/2011
📘 Acids, Bases and Salts📚 pH Scale
Q19

Which pH range is most suitable for life of fresh water plants and animals?

🎯 Allahabad HC ARO 19/12/2021 Shift-II
📘 Acids, Bases and Salts📚 pH Scale
Q20

Which of the following statements is not correct?

🎯 Allahabad HC ARO 14/12/2021 Shift-II