[Solved] JEXPO 2018 Chemistry Question Paper

[Solved] JEXPO 2018 Chemistry Question Paper

JEXPO 2018 Physics Question Paper with Solution

Q.1) The number of covalent bonds present in ethylene is

5

6

4

7

Q.2) The fraction of petroleum used as the jet fuel is

alcohol

kerosene

diesel

petrol

Q.3) Wood charcoal is used in gas masks because

dissolves poisonous gases

has good smell

absorbs poisonous gases

reacts with poisonous gases

Q.4) Complete combustion of hydrocarbons produces

CO + H₂O

CO + H₂

CO₂ + H₂O

CO₂ + H

Q.5) Neopentane and isopentane are

homologues

isobars

isomers

allotropes

Q.6) Dry ice is

solid CO

solid CO₂

solid SO₂

solid He

JEXPO 2018 Physics Question Paper with Solution

Q.7) Cinnabar is an ore of

Pb

Hg

Zn

Cu

Q.8) Gold is alloyed with which metal to make it harder?

C

Hg

Ag

Cu

Q.9) Which of the following is used for making magnets?

Magnalium

Duralumin

Bronze

Alnico

Q.10) Which one of the following metal is the most reactive?

Sodium

Magnesium

Potassium

Lead

Q.11) Which of the following reactions led to the discovered neutron?

C 6 14  +  H 1 1 → N 7 14  +  n 0 1

B 5 11  +  H 1 2 → C 6 12  +  n 0 1

B 4 8 e +  H 2 4 e→ C 6 11  +  n 0 1

B49e + H24e→C612 + n01

Q.12) The pH of a neutral solution at 35°C is

< 7

7

> 7

Zero

Q.13) Which one of the following is used as “clean fuel”?

Petrol

Methane

Mineral Oil

LPG

Q.14) The element with lowest IE₁ is

sodium

cesium

magnesium

barium

Explanation

/p>

Q.15) Which of the following elements is most electropositive?

Si

Mg

Ca

H

Q.16) Which one of the following has the smallest size?

Al

Al⁺²

Al⁺

Al⁺³

Q.17) Which of the following hydroxide is most basic?

Be(OH)₂

Ba(OH)₂

Mg(OH)₂

Ca(OH)₂

Q.18) Elements of which family form anion most readily?

Nitrogen

Alkali Metals

Oxygen

Halogens

Q.19) Which of the following is known as “Indian saltpetre”?

Calcium nitrate

Sodium nitrate

Sodium chloride

Potassium nitrate

Q.20) Liquor ammonia has a specific gravity of

1

2

0.94

0.88

Q.21) What is the decreasing order of given metals in which they displace each other from the solution of their salts?

Zn > Al > Mg > Cu > Fe

Cu < Fe < Mg < Zn < Al

Mg > Al > Zn > Fe > Cu

Fe < Cu < Zn < Al < Mg

Q.22) In Galvanic cell, which form of energy is converted into which form?

Chemical to electrical

Electrical to chemical

Mechanical to chemical

Chemical to mechanical

Q.23) The quantity of charge required to liberate one gram equivalent of substance is

90000 coulomb

98500 coulomb

96500 coulomb

99500 coulomb

Q.24) ________ are ________ at the anode and _______ at the cathode.

Ions, reduced, oxidised

Atoms, reduced, oxidised

Ions, oxidised, reduced

Metals, oxidised, reduced

Q.25) Complete equipment of electrolysis is known as

electrolytic circuit

electrolytic cell

electrolytic current

electrolytic process

Q.26) In electrolysis of pure ionic molten compounds, metal is formed at

anode

inert electrode

cathode

base of apparatus

Q.27) Effect of High Voltage needed to discharge OH-ion is called

over voltage effect

hydroxyl effect

All of these

high effect

Q.28) For electrolysis of aluminium oxide, it must be

liquid

solid

vapour

molten

Q.29) Oxidation number of any isolated element is

unit

infinite

zero

None of those

Q.30) Which type of salts are stored in air-tight containers?

Anhydrous

Hydrated

Deliquescent

Dehydrated

Q.31) Which of the following is spread on icy roads to melt ice in cold countries?

None of those

Rock salt

NaOH

Na₂CO₃

Q.32) What happens when hydrated copper sulphate is heated?

It becomes colourless

It loses water of crystallization

It turns into anhydrous salt

All of these

Q.33) Which of the following acid is present in Guava?

Acetic acid

Tartaric acid

Lactic acid

Oxalic acid

Q.34) Soda ash is a mixture of

weak acid and strong base

strong acid and weak base

weak acid and weak base

strong acid and strong base

Q.35) Which of the following acid is used in fire extinguishers?

Sulfuric acid (H₂SO₄)

Hydrochloric acid (HCl)

Nitric acid (HNO₃)

Oxalic acid

Q.36) A pH – 2 solution is more acidic than one with pH – 6 by a factor of

4000

2

8000

10000

Q.37) As the electron moves away from the nucleus, its potential energy

None of those

decreases

remains constant

increases

Q.38) Which of the following contains only one unpaired electron in the valence shell?

₂₁Sc

₁₁Na

₉F

₇N

Q.39) Rutherford’s scattering formula fails for very small scattering angles because

kinetic energy of α particles is larger

the full nuclear charge of the target atom is partially screened by the electrons

the gold foil is very thin

All of these

Q.40) The nucleus of a hydrogen atom is called

nucleons

electron

proton

neutron

Q.41) An element has electronic configuration 2,8,4. It will be classified as

non-metal

metal

metalloid

None of those

Q.42) A hydrocarbon contains 75% of carbon. Then the molecular formula of it will be

CH₄

C₂H₆

C₂H₄

C₂H₂

Q.43) 1 mmHg represents a pressure of

760 atm

1 760

atm

1 76 × 10 −2

atm

1 76

atm

Q.44) Buckminster fullerene is an allotropic form of

Phosphorus

Sulphur

Carbon

Boron

Q.45) Upto which element the law of octaves are found to be applicable

Oxygen

Cobalt

Calcium

Potassium

Q.46) When lead nitrate reacts with hydrogen sulphide gas, the colour of the precipitate so formed is

yellow

black

gelatinous white

green

Q.47) Which among the following is a gaseous covalent compound?

Hydrogen chloride

Glucose

Hydrochloric acid

Water

Q.48) What is the value of “R” in cal/mol/K in the equation PV = nRT?

1.987

2.987

4.987

3.987

Q.49) ______is an example of bent molecule.

Water

Methane

Ammonia

Carbon-dioxide

Q.50) Octet rule is not violated in case of

CH₄

SF₆

BF₃

AlCl₃

JEXPO 2018 Physics Question Paper with Solution

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