Wed. Apr 24th, 2024
[Solved] JEXPO 2018 Chemistry Question Paper


[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

 

Answer

Correct Answer: 6

Explanation

No explanation

 

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

alcohol

kerosene

diesel

petrol

 

Answer

Correct Answer: kerosene

Explanation

No explanation

 

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

dissolves poisonous gases

has good smell

absorbs poisonous gases

reacts with poisonous gases

 

Answer

Correct Answer: absorbs poisonous gases

Explanation

No explanation

 

Q.4) Complete combustion of hydrocarbons produces

CO + H2O

CO + H2

CO2 + H2O

CO2 + H

 

Answer

Correct Answer: CO2 + H2O

Explanation

Complete combustion of hydrocarbon produces  CO2 + H2O  but incomplete combustion of hydrocarbon produces  CO + H2O

Complete Combustion of Hydrocarbon
CH4 + 2O2 = CO2 + 2H2O

Incomplete Combustion of Hydrocarbon
2CH4 + 3O2 = 2CO + 4H2O

 

Q.5) Neopentane and isopentane are

homologues

isobars

isomers

allotropes

 

Answer

Correct Answer: isomers

Explanation

No explanation

 

Q.6) Dry ice is

solid CO

solid CO2

solid SO2

solid He

 

Answer

Correct Answer: solid CO2

Explanation

Dry ice, sometimes referred to as “cardice”, is the solid form of carbon dioxide. It is used primarily as a cooling agent. Dry ice sublimates at 194.65 K (−78.5°C; −109.3°F), at Earth atmospheric pressures.
Ref : https://en.wikipedia.org/wiki/Dry_ice

JEXPO 2018 Physics Question Paper with Solution

Q.7) Cinnabar is an ore of

Pb

Hg

Zn

Cu

 

Answer

Correct Answer: Hg

Explanation

To get the properties, chemical formula and all other details, click here.

 

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

C

Hg

Ag

Cu

 

Answer

Correct Answer: Cu

Explanation

Gold is highly malleable metal. Ornaments can’t be made from pure gold because its softness and can’t maintain its rigidity.

In order to maintain its rigidity and easier to work, gold is alloyed with copper or silver. And this also gives a lustrous yellow appearance to the ornaments

 

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

Magnalium

Duralumin

Bronze

Alnico

 

Answer

Correct Answer: Alnico

Explanation

No explanation

 

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

Sodium

Magnesium

Potassium

Lead

 

Answer

Correct Answer: Potassium

Explanation

 

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

 

Answer

Correct Answer:

B49e + H24e→C612 + n01

Explanation

No explanation

 

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

< 7

7

> 7

Zero

 

Answer

Correct Answer: < 7

Explanation

The pH of a neutral solution at 25°C is 7 but it decreases with increases the temperature.

 

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

Petrol

Methane

Mineral Oil

LPG

 

Answer

Correct Answer: LPG

Explanation

LPG, CNG etc. is used as clean fuel. Because they emit less amount of pollutant gas like carbon di-oxide in the air. Hence they cause less air pollution.

 

Q.14) The element with lowest IE1 is

sodium

cesium

magnesium

barium

 

Answer

Correct Answer: cesium

Explanation

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

Si

Mg

Ca

H

 

Answer

Correct Answer: Ca

Explanation

No explanation

 

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

Al

Al+2

Al+

Al+3

 

Answer

Correct Answer: Al+3

Explanation

Al atom loses 3 electrons from its outer most orbits to form Al+3 ion. After losing 3 electrons, the attractive force between protons and electrons get increases, hence atomic radius get decreases.

 

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

Be(OH)2

Ba(OH)2

Mg(OH)2

Ca(OH)2

 

Answer

Correct Answer: Ba(OH)2

Explanation

No explanation

 

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

Nitrogen

Alkali Metals

Oxygen

Halogens

 

Answer

Correct Answer: Halogens

Explanation

No explanation

 

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

Calcium nitrate

Sodium nitrate

Sodium chloride

Potassium nitrate

 

Answer

Correct Answer: Potassium nitrate

Explanation

No explanation

 

Q.20) Liquor ammonia has a specific gravity of

1

2

0.94

0.88

 

Answer

Correct Answer: 0.88

Explanation

No explanation

 

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

 

Answer

Correct Answer: Mg > Al > Zn > Fe > Cu

Explanation

No explanation

 

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

 

Answer

Correct Answer: Chemical to electrical

Explanation

No explanation

 

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

90000 coulomb

98500 coulomb

96500 coulomb

99500 coulomb

 

Answer

Correct Answer: 96500 coulomb

Explanation

No explanation

 

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

Ions, reduced, oxidised

Atoms, reduced, oxidised

Ions, oxidised, reduced

Metals, oxidised, reduced

 

Answer

Correct Answer: Ions, oxidised, reduced

Explanation

No explanation

 

Q.25) Complete equipment of electrolysis is known as

electrolytic circuit

electrolytic cell

electrolytic current

electrolytic process

 

Answer

Correct Answer: electrolytic cell

Explanation

No explanation

 

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

anode

inert electrode

cathode

base of apparatus

 

Answer

Correct Answer: cathode

Explanation

No explanation

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

over voltage effect

hydroxyl effect

All of these

high effect

 

Answer

Correct Answer: over voltage effect

Explanation

No explanation

 

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

liquid

solid

vapour

molten

 

Answer

Correct Answer: molten

Explanation

No explanation

 

Q.29) Oxidation number of any isolated element is

unit

infinite

zero

None of those

 

Answer

Correct Answer: zero

Explanation

No explanation

 

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

Anhydrous

Hydrated

Deliquescent

Dehydrated

 

Answer

Correct Answer: Deliquescent

Explanation

No explanation

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

None of those

Rock salt

NaOH

Na2CO3

 

Answer

Correct Answer: Rock salt

Explanation

No explanation

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

 

Answer

Correct Answer: All of these

Explanation

No explanation

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

Acetic acid

Tartaric acid

Lactic acid

Oxalic acid

 

Answer

Correct Answer: Lactic acid

Explanation

No explanation

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

 

Answer

Correct Answer: weak acid and strong base

Explanation

No explanation

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

Sulfuric acid (H2SO4)

Hydrochloric acid (HCl)

Nitric acid (HNO3)

Oxalic acid

 

Answer

Correct Answer: Sulfuric acid (H2SO4)

Explanation

No explanation

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

4000

2

8000

10000

 

Answer

Correct Answer: 10000

Explanation

No explanation

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

None of those

decreases

remains constant

increases

 

Answer

Correct Answer: increases

Explanation

No explanation

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

21Sc

11Na

9F

7N

 

Answer

Correct Answer: 11Na

Explanation

No explanation

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

 

Answer

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

Explanation

No explanation

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

nucleons

electron

proton

neutron

 

Answer

Correct Answer: nucleons

Explanation

No explanation

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

non-metal

metal

metalloid

None of those

 

Answer

Correct Answer: metalloid

Explanation

No explanation

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

CH4

C2H6

C2H4

C2H2

 

Answer

Correct Answer: CH4

Explanation

No explanation

Q.43) 1 mmHg represents a pressure of

760 atm

1 760

atm

1 76 × 10 −2

atm

1 76

atm

 

Answer

Correct Answer:

1 760atm

Explanation

No explanation

Q.44) Buckminster fullerene is an allotropic form of

Phosphorus

Sulphur

Carbon

Boron

 

Answer

Correct Answer: Carbon

Explanation

No explanation

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

Oxygen

Cobalt

Calcium

Potassium

 

Answer

Correct Answer: Calcium

Explanation

No explanation

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

yellow

black

gelatinous white

green

 

Answer

Correct Answer: black

Explanation

No explanation

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

Hydrogen chloride

Glucose

Hydrochloric acid

Water

 

Answer

Correct Answer: Hydrogen chloride

Explanation

No explanation

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

 

Answer

Correct Answer: 1.987

Explanation

No explanation

Q.49) ______is an example of bent molecule.

Water

Methane

Ammonia

Carbon-dioxide

 

Answer

Correct Answer: Water

Explanation

No explanation

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

CH4

SF6

BF3

AlCl3

 

Answer

Correct Answer: CH4

Explanation

No explanation

JEXPO 2018 Physics Question Paper with Solution


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