Question # 1

Cathode rays are actually

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Electrons

Protons

Neutrons

Photons

Nelson's cells used to prepare caustic soda along with gases. Which of the following gas is produced at cathode?

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CI₂

H₂

O₃

O₂

Metals are ________________

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Liquid

Solid

Gas

Malleable

Force per unit area is called:

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volume

pressure

weight

density

Non-metals do not reaction with

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Strong bases

Concentrated acids

Dilute acids

Salts

Which one metal is least reactive?

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K

Fe

Cu

AI

Which one of the following is an electron deficient molecule?

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HN₃

BF₃

N₂

O₂

positive ion hare formed by _________ of electrons.

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Gain

Loss

Sharing

Bonding

The solubility of which salt increases in heating?

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Li₂SO₄

Ce₂(SO₄)₃

NaCI

KCI

Canal rays are actually

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Electrons

Protons

Neutrons

X-rays

Which one of the following is not an electrolytic cell:

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Down cell

Galvanic cell

Nelson' cell

Both a and c

Traces of acetylene are present in coal gas about.

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0.06 %

0.08%

1.1%

90%

How many percentage of sunlight is absorbed by atmosphere gases.

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12%

18%

24%

30%

Which base is more corrosive?

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NH₄OH

NaOH

Ca(OH)₂

AL(OH)₂

Bond energy of C-C is.

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200 KJmol^-1

452 KJmol^-1

300 KJmol^-1

355 KJmol^-1

Atmosphere is divided into;

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3 regions

4 regions

5 regions

6 regions

_______ is the king of chemicals.

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Hydrochloric acid

Nitric Acid

Sulphuric acid

Phosphoric acid

The coal in which the percentage of carbon is 60%

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Peat

Lignite

Bituminous

Anthracit

Incinerator reduces solid waste into .

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Ash

Flue gas

Heat

All of them

If Qc < Kc the reaction goes in:

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Forward

Reverse

At equilibrium state

None

Sindh alkalies limited was established near Karachi in.

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1965

1966

1970

2000

The region of ozone decomposition in stratosphere is.

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20 km

30 km

40 km

50 km

When aqueous NaCl is electrolyzed, which of the following ions gas discharged at anode.

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Cl-

OH-

Na+

H+

Compound which undergo sublimation is

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KMnO4

CaCO3

NH4Cl

Na2CO3

Two solutions of NaCl and KCl are prepared separately by dissolving same amount of the solute in water. Which of the following statements is true for these solution.

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KCl solution will have higher boiling pint than NaCl solution

Both the solutions have different boiling point

KCl and NaCl solutions possess same vapour pressure

KCl solution possesses lower freezing point than NaCl solution

Solvent extraction is an equilibrium process and is controlled by.

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Law of mass action

The mount of solvent used

The amount of solute

Distribution law

X- rays have same nature as

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Alpha rays

Beta rays

Gamma rays

Cathods rays

Gas equation is derived by combining

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Avogadro's and Charles's Law

Boyle's and Charles's Law

Avogadro's and Boyle's Law

Avogadro's, Boyle's and Charles's Law

The molecules of CO2 i dry ice form the.

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Ionic crystals

Molecular crystals

Amorphous

Covalent crystals

In solvent extraction, solute can be separated from solution, by shaking the solution with solvent in which the solute is.

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More soluble

Partially soluble

Insoluble

soluble at high temp

Select the correct answer out of the following alternative suggestions London dispersion forces are the only forces present among the.

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Molecules of water in liquid state

Atoms of helium is gaseous state at high temperature.

Molecules of solid I2

Molecule of H-Cl gas

Molarity of pure water is

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1

18

55.5

6

pKa of CH3COOH is 4.74. The pKb value of CH3COO- ions will be

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7

14

9.26

zero

The reactivity order of alkyl halides for a particular alkyl group is

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Fluoride > Chloride > Bromide > iodide

Chloride > Bromide > Fluoride > iodide

Bromide > iodide > chloride > Fluoride

Iodide > Bromide > Chloride > Fluoride

Bromine can be liberated from KBr solution by the action of.

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I2 solution

Chlorine

NaCl

KI

Which acid is used in the manufacture of synthetic fibre

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Formic acid

Oxalic acid

Carbonic acid

Acetic acid

A polymeric substance that is formed in the liquid state and then hardened to a rigid solid is called a

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fibre

plastic

varnish

polyamide resin

Chlomyl chloride test is used for the confirmation of

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Cl-

CO3^-2

NO3-

Cu2+

Which one of the following oxide is brown in colour.

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NO

NO2

N2O

N2O3

Formation of cyanohydrin from an aldehyde in an example of.

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Nucleophilic substitution

Nucleophilic addition

Electrophilic addition

Electrophilic substitution

Water will be considered polluted if it has dissolved oxygen.

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3ppm

4ppm

5ppm

6 ppm

Cyanogen chloride reacts with ethyl magnesium bromide to give

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CH₃CH₂Cl

CH₃CH₂Br

C₄H₁₀⁺

CH₃CH₂CN

Which is called marsh gas

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S2Cl2

SOCl2

CH4

CHBr3

Which chemicals used for detection of amino acids.

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NaOH + I2

Phenyl hydrazine

Ninhydrin

Benedict's solution