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Chemistry - MOST IMPORTANT Executive Civil Previous Year Questions

Practice real questions from previous year exams of Executive Civil.

📘 Important Chemical Compounds📚 Sodium Hydroxide

Q1

One of the best methods for the large scale manufacturing of sodium hydroxide is ________.

🎯 DFCCIL Executive Civil 2025

A.

electrolysis of water

B.

electrolysis of ammonia

C.

electrolysis of brine

D.

electrolysis of acetic acid

📘 Organic Chemistry📚 Misc

Q2

Which of the following is the correct definition of a homologous series?

🎯 DFCCIL Executive Civil 2025

A.

A series of compounds with different functional groups.

B.

A series of compounds with the same molecular formula.

C.

A group of compounds with varying physical and chemical properties.

D.

A series of compounds having the same functional group and similar chemical properties.

📘 Organic Chemistry📚 Nomenclature

Q3

A hydrocarbon has the molecular formula C5H12. If one hydrogen atom at the second carbon is replaced by a hydroxyl (-OH) group, what is the correct IUPAC name of the compound?

🎯 DFCCIL Executive Civil 2025

A.

1-Pentanol

B.

2-Pentanol

C.

2-Methylbutanol

D.

Pentanol

📘 Pure Substance- Element-Classification of Matter on the basis of Chemical Properties- II📚 Metals and its properties

Q4

Why are metals like potassium and sodium kept immersed in kerosene oil?

🎯 DFCCIL Executive Civil 2025

A.

To prevent them from rusting

B.

To enhance their reactivity

C.

To protect them from reacting with oxygen and catching fire

D.

To improve their conductivity

📘 Solution📚 Colloid and its types

Q5

Which of the following statements are true about the colloids? i. A colloid is a heterogeneous mixture. ii. The size of particles of a colloid is too small to be individually seen with naked eyes. iii. They cannot be separated from the mixture by the process of filtration. But a special technique of separation known as centrifugation can be used to separate the colloidal particles.

🎯 DFCCIL Executive Civil 2025

A.

Only ii and iii

B.

Only i and iii

C.

Only i and ii

D.

i, ii and iii

📘 Acids, Bases and Salts📚 pH Scale

Q6

Which of the following statements is/are correct regarding the pH scale? I. The pH of a neutral solution is 7. II. Values more than 7 on the pH scale represent an acidic solution.

🎯 DFCCIL Executive Civil 2023

A.

Only I

B.

Only II

C.

Both I and II

D.

Neither I nor II

📘 Organic Chemistry📚 Hydrocarbons

Q7

Which of the following fuels is/are fossil fuels? I. Coal II. Petroleum III. Wood

🎯 DFCCIL Executive Civil 2023

A.

I and III

B.

II and III

C.

I and II

D.

I, II and III

📘 Important Chemical Compounds📚 Misc

Q8

What is the chemical formula for marble?

🎯 DFCCIL Executive Civil 2023

A.

Ca(OH)2

B.

CaSO4

C.

CaO

D.

CaCO3

📘 Periodic Table📚 Dobereiner's Triad

Q9

Which of the following statements is/are correct regarding Döbereiner's Triads? I. Döbereiner showed that when the three elements in a triad were written in the order of increasing atomic masses; the atomic mass of the middle element was roughly the average of the atomic masses of the other two elements. II. Döbereiner identified eight triads from the elements known at that time.

🎯 DFCCIL Executive Civil 2023

A.

Both I and II

B.

Neither I nor II

C.

Only I

D.

Only II

📘 Atomicity📚 Triatomic

Q10

Ozone is a molecule formed by ____ atoms of oxygen.

🎯 DFCCIL Executive Civil 2023

A.

four

B.

three

C.

five

D.

two

📘 Periodic Properties📚 Atomic Radius

Q11

In the modern periodic table, the atomic radius ____ in moving from left to right along a period.

🎯 DFCCIL Executive Civil 2023

A.

first decreases then increases

B.

decreases

C.

increases

D.

first increases then decreases

📘 Acids, Bases and Salts📚 Name of Acid present in compounds

Q12

Which acid is found in tomato?

🎯 DFCCIL Executive Civil 2021

A.

Acetic

B.

Tartaric

C.

Methanoic

D.

Oxalic

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