Chemistry · NDA previous year questions

Which one among the following compounds has a sweet and fruity smell?

1. A.Ethyl alcohol
2. B.Acetic acid
3. C.Ethyl acetate
4. D.Acetophenone

What is the coordination number of Na⁺ and Cl⁻ ions in NaCl lattice?

1. A.6, 1
2. B.1, 6
3. C.6, 6
4. D.5, 5

Which one among the following is present in the nettle leaf hairs that causes burning pain?

1. A.Methanoic acid
2. B.Ethanol acid
3. C.Benzoic acid
4. D.Acetic acid

Which one among the following is known as Milk of Magnesia?

1. A.Magnesium bicarbonate
2. B.Magnesium carbonate
3. C.Magnesium sulphate
4. D.Magnesium hydroxide

Which one among the following oxides has the highest melting point?

1. A.$\mathrm{N}{\mathrm{a}}_2\mathrm{O}$
2. B.$\mathrm{MgO}$
3. C.$\mathrm{F}{\mathrm{e}}_2{\mathrm{O}}_3$
4. D.$\mathrm{CuO}$

Of the following, which does not belong to a nuclear reactor?

1. A.A turbine
2. B.A heat exchanger
3. C.A mechanism to reduce $\mathrm{C}{\mathrm{O}}_2$ emission
4. D.A reaction chamber

Which one of the following scientists mentioned that an electron in an atom could revolve in certain stable orbits without the emission of radiant energy?

1. A.Ernest Rutherford
2. B.J.J. Thomson
3. C.Niels Bohr
4. D.Albert Einstein

Which one of the following is primarily responsible for conduction of current in a metal?

1. A.Bound electrons
2. B.Free electrons
3. C.Both bound and free electrons
4. D.Ions

The heating element in an electric iron is usually made of

1. A.Constantan
2. B.Tungsten
3. C.Nichrome
4. D.Copper

Which one of the following alloys contains a non-metal as one of its constituent?

1. A.Brass
2. B.Bronze
3. C.Amalgam
4. D.Steel

Buckminster fullerene, which looks like a football, is an allotropic form of

1. A.Phosphorus
2. B.Sulfur
3. C.Carbon
4. D.Tin

Consider the following reaction: $$\mathrm{F}{\mathrm{e}}_2{\mathrm{O}}_3(\mathrm{s})+2Al(\mathrm{s})\to 2Fe(\mathrm{s})+\mathrm{A}{\mathrm{l}}_2{\mathrm{O}}_3(\mathrm{s})$$ Which of the following statements about the given reaction is NOT correct?

1. A.It is an example of displacement reaction
2. B.It is highly endothermic reaction
3. C.$\mathrm{F}{\mathrm{e}}_2{\mathrm{O}}_3$ acts as oxidizing agent
4. D.This reaction is applicable to joining of railway tracks

Match List I with List II and select the correct answer using the code given below the Lists: $$\begin{array}{llll}\text{LIST I}& & \text{LIST II}& \\ \text{(Chemical process)}& & \text{(Reaction)}& \\ \text{A.}& \text{Electrolysis of water}& 1.& \text{Double displacement reaction}\\ \text{B.}& \text{Burning of coal}& 2.& \text{Combination reaction}\\ \text{C.}& \text{Iron nail immersed in copper sulphate solution}& 3.& \text{Decomposition reaction}\\ \text{D.}& \text{Addition of barium chloride solution to aluminium sulphate solution}& 4.& \text{Displacement reaction}\end{array}$$

1. A.A - 3, B - 4,C - 2, D - 1
2. B.A - 4, B - 2,C - 1, D - 3
3. C.A - 3, B - 2,C - 4, D - 1
4. D.A - 4, B - 1,C - 2, D - 3

Which one of the following processes involves chemical reaction?

1. A.Evaporation of petrol
2. B.Dissolution of salt in water
3. C.Storing of oxygen gas under pressure in a gas cylinder
4. D.Burning of magnesium ribbon in air

Which one of the following metals does NOT react with cold water to liberate hydrogen gas?

1. A.Potassium
2. B.Iron
3. C.Calcium
4. D.Sodium 2 3

Consider the following reaction: $$2HgO\stackrel{\mathrm{\Delta }}{\to }2Hg+{\mathrm{O}}_2$$ The respective state of $\mathrm{HgO}$, $\mathrm{Hg}$ and ${\mathrm{O}}_2$ in the above reaction is

1. A.Liquid, solid, gas
2. B.Solid, solid, gas
3. C.Liquid, solid, liquid
4. D.Solid, liquid, gas

Which one of the following acid is used by goldsmith for cleaning of gold and silver articles?

1. A.Sulphuric acid
2. B.Nitric acid
3. C.Hydrochloric acid
4. D.Phosphoric acid

What is the action of litmus on ethanol?

1. A.Litmus is neutral towards ethanol
2. B.Ethanol turns blue litmus to red; confirming acidic nature of ethanol
3. C.Ethanol turns red litmus to blue; confirming basic nature of ethanol
4. D.Ethanol decolorizes litmus through bleaching action

Which one of the following metal is NOT an essential component in stainless steel?

1. A.Iron
2. B.Nickel
3. C.Chromium
4. D.Tin

Which one of the following metals can be extracted using carbon as reducing agent?

1. A.Zinc
2. B.Silver
3. C.Gold
4. D.Aluminum

How many of the following materials can be attracted by a magnet? 1. Plastic 2. Carbon 3. Aluminium 4. Stainless Steel Select the correct answer using the code given below:

1. A.1
2. B.2
3. C.3
4. D.None

Which of the hydrocarbons are arranged as per the increasing order of their boiling points?

1. A.Methane, Butane, Propane, Heptane
2. B.Propane, Butane, Pentane, Octane
3. C.Propane, Butane, Heptane, Methane
4. D.Octane, Ethane, Methane, Propane

An iron nail dipped in copper sulphate solution turns brown. This is due to which one of the following types of reactions?

1. A.Addition reaction
2. B.Decomposition reaction
3. C.Substitution reaction
4. D.Displacement reaction

Toothpaste prevents tooth decay by:

1. A.neutralizing the excess acidity.
2. B.means of emulsification.
3. C.the action of fluoride.
4. D.making a coat of calcium over the teeth surface.

Mica is mainly used in:

1. A.food and beverage industry.
2. B.iron and steel industry.
3. C.aluminium industry.
4. D.electrical and electronic industries. 1 2 1 1 2 2