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Chemistry - MOST IMPORTANT NDA Previous Year Questions

Practice real questions from previous year exams of NDA.

📘 Chemical Reactions📚 Misc

Q1

Let there be an object having some chemicals in it. It starts moving with a uniform velocity v and a chemical reaction starts happening. In this case, which of the following statement(s) is/are correct? 1. Chemical reactions happening in the system cannot change the velocity (v) of the centre of mass of the object. 2. Chemical reactions happening in the system cannot change kinetic energy of the particles inside with respect to the centre of mass of object. Select the correct answer using the code given below:

🎯 NDA 2019 (II)

A.

Only 1

B.

Only 2

C.

Both 1 and 2

D.

Neither 1 nor 2

📘 Oxidation and Reduction📚 Oxidation

Q2

Which one of the following compounds does not exhibit a different oxidation number of the same element?

🎯 NDA 2019 (II)

A.

Pb3O4

B.

Fe3O4

C.

Fe2O3

D.

Mn3O4

📘 Physical States of Matter and Their properties📚 Misc

Q3

Which one of the following statements about glass is not correct?

🎯 NDA 2019 (II)

A.

Glass is often said to be a supercooled liquid.

B.

Glass has no definite melting point.

C.

Soda glass is harder than pyrex glass.

D.

Boron is present in pyrex glass.

📘 Phase Changing Processes and Their Factors📚 Boiling or Vaporization

Q4

Which one of the following statements is correct?

🎯 NDA 2019 (II)

A.

Both boiling and evaporation are surface phenomena.

B.

Boiling is a surface phenomenon, but evaporation is a bulk phenomenon.

C.

Both boiling and evaporation are bulk phenomena.

D.

Boiling is a bulk phenomenon, but evaporation is a surface phenomenon.

📘 Carbon Allotropes📚 Carbon Allotrope (Crystalline)

Q5

Which one of the following statements about diamond and graphite is not correct?

🎯 NDA 2019 (II)

A.

Diamond has a tetrahedral structure, whereas graphite has a hexagonal planar structure.

B.

Both physical and chemical properties of diamond and graphite are different.

C.

Graphite is soft, but diamond is hard.

D.

Graphite is a good conductor of electricity, while diamond is not.

📘 Important Chemical Compounds📚 Misc

Q6

The raw materials used for the manufacture of Portland cement are

🎯 NDA 2019 (II)

A.

lime, silica and sulphur dioxide

B.

lime, silica and carbon dioxide

C.

lime, silica and alumina

D.

lime, silica and boric acid

📘 Water📚 Misc

Q7

Which one of the following statements about water is not true?

🎯 NDA 2019 (II)

A.

Hydrogen bonds are present in liquid water.

B.

Water has a high boiling point.

C.

Water has a high heat of fusion.

D.

Water is a non-polar molecule.

📘 Chemistry in Everyday Life📚 Cleansing Agents (Soaps and Detergents)

Q8

A sample of 'soft soap' contains

🎯 NDA 2019 (II)

A.

caesium

B.

potassium

C.

calcium

D.

magnesium

📘 Acids, Bases and Salts📚 Types of Salts -Acidic, Basic, etc.

Q9

Which one of the following does not represent the salt, calcium carbonate?

🎯 NDA 2019 (II)

A.

Lime water

B.

Limestone

C.

Chalk

D.

Marble

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

Q10

Which one of the following substances is not a mixture?

🎯 NDA 2019 (II)

A.

Tin

B.

Sea water

C.

Soil

D.

Air

📘 Important Chemical Compounds📚 Misc

Q11

Which one of the following is termed as 'dry ice'?

🎯 NDA 2019 (II)

A.

Ice present in ice-cream

B.

Solid water at Antarctica

C.

Solid state of carbon dioxide

D.

Solid water of ionosphere

📘 Solution📚 Misc

Q12

Net movement of water from a dilute to a concentrated solution through a selectively permeable membrane is called

🎯 NDA 2019 (II)

A.

Diffusion

B.

Dispersion

C.

Osmosis

D.

Absorption

📘 Atomic Models📚 Cathode Ray Experiment

Q13

Which one of the following statements regarding cathode rays is not correct?

🎯 NDA 2019 (II)

A.

Cathode ray particles are electrons.

B.

Cathode ray particles start from anode and move towards cathode.

C.

In the absence of electrical and magnetic fields, cathode rays travel in straight lines.

D.

Television picture tubes are cathode ray tubes.

📘 Important Chemical Compounds📚 Misc

Q14

A very large volume of hydrogen can be accommodated by making

🎯 NDA 2019 (II)

A.

non-metallic hydrides

B.

hydrogen peroxide

C.

non-stoichiometric hydrides

D.

alkali metal hydrides

📘 Atomicity📚 Monoatomic

Q15

Which one of the following is not a monoatomic element?

🎯 NDA 2019 (II)

A.

Copper

B.

Helium

C.

Iodine

D.

Barium

📘 Electrochemistry📚 Electrode Potential

Q16

Which one of the following represents the correct order of electron releasing tendency of metals?

🎯 NDA 2019 (II)

A.

Zn > Cu > Ag

B.

Ag > Cu > Zn

C.

Cu > Zn > Ag

D.

Cu > Ag > Zn

📘 Bond Parameters📚 Bond Enthalpy or Energy

Q17

Which one of the following energy is stored in the links between the atoms?

🎯 NDA 2019 (I)

A.

Nuclear energy

B.

Chemical energy

C.

Potential energy

D.

Thermal energy

📘 Radioactivity📚 Applications of Radioactivity

Q18

Which one of the following minerals is used as a fuel in nuclear power stations?

🎯 NDA 2019 (I)

A.

Bauxite

B.

Quartz

C.

Feldspar

D.

Pitch-blende

📘 Chemistry in Everyday Life📚 Cleansing Agents (Soaps and Detergents)

Q19

Which one of the following is not a synthetic detergent?

🎯 NDA 2019 (I)

A.

CH3(CH2)10CH2OSO3Na+

B.

[CH3(CH2)15-N-(CH3)3]+Br-

C.

CH3(CH2)16COO-Na+

D.

CH3(CH2)16COO(CH2CH2O)nCH2CH2OH

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

Q20

Which one of the following is an example of a clean fuel?

🎯 NDA 2019 (I)

A.

Coke

B.

Propane

C.

Petrol

D.

Wax

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