Question # 1

Which one of the following is not an electrolyte?

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sugar solution

sulphuric acid solution

Lime solution

Sodium chloride solution

Salt & water is a _________ mixture.

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Homogeneous

Heterogeneous

It is not mixture

Nil

CO2 the oxidation number of C =.

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+1

+2

+3

+4

The period of Alchemists extends from _________ AD.

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800 to 1800

600 to 1600

900 to 1900

700 to 1700

Solids are fixed ____________

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Shape

Velocity

Mass

Atoms

At freezing point which one of the following coexists in dynamic equilibrium?

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gas and solid

liquid and gas

liquid and solid

all of these

Transition temperature of sulphur is ____________

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95.6

95

95.5

96

positive ion hare formed by _________ of electrons.

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Gain

Loss

Sharing

Bonding

The symbol of sodium is :

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Sa

Na

Pa

Ca

4th & 5th consist of ________________ elements.

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8

18

32

infinite

In the redox reaction between zn and HCI. the oxidizing agent is:

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zn

H⁺

C

H²

Dehydrohalogenation takes place in the presence of .

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NaOH aqueous

Alcoholic KOH

Aqeous KOH

Alcoholic NaOH

Who was prepared acetic acid in laboratory?

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Berzelius

Wohler

Kolbe

Dalton

Building block of lipids are.

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Fatty acids

Carboxylic acids

Mineral acids

Alcohols

Ultraviolet radiations can causes.

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Hepatitis

Asthma

Skin cancer

Night blindness

Crude oil is heated to the fractionating furnace upto.

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300 ^oC

350^oC

400^oC

450^oC

Almost all aircrafts fly in:

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troposphere

mesosphere

stratosphere

themosphere

When the numbers of moles of both sides are equal in a reaction, then the unit of K_c will be:

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No unit

mol^-2 dm⁶

mol dm³

mol^-2dm

Which salt is used as a table salt?

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NaCl

Na₂CO₃

Na₂SiO₃

NaCl

Halogenation of methane produces following valuable chemical compounds used as solvents except.

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Carbonterachloride

Chloroform

Carbon Black

Chloromethane

In a chemical reaction, the substance that combine are called.

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Reactant

Products

Mass

Material

Which gas is not present in atmosphere?

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Nitrogen

Oxygen

Helium

Carbon dioxide

NH3 shows a maximum boiling point among the hydrides of the group V elements due to.

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Very small size of nitrogen

Long pair of electrons present on nitrogen

Enhanced electronegative character of nitrogen

Pyramidal structure of NH3

During the process of crystallization, the hot saturated solution;

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Is cooled very slowly to get large-sized crystals

Is cooled at a moderated rate to get medium-sized crystals

Is evaporated to get the crystals of the product

Is mixed with an immiscible liquid to get the pure crystals of the produce

Rate of diffusion of CO and N₂are same at room temperature due to the reason, that

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Both are diatomic molecules

Both have same multiple bond in them

Both have lone pairs in them

Both have same molar masses

Which of the following molecules has zero dipole moment

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NH₃

CHCI₃

H₂O

BF₃

Which one of the following inter molecular forces are present in neon gas molecules.

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Hydrogen bond

dipole -Dipole attraction

London dispersion force

Hydrogen bonding and London dispersion force

Splitting of spectral lines when atoms are subjected to strong electric field is called

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Zeeman effect

Stark effect

Photoelectric effect

Compton effect

When i₂present in the aquous layer in the form of I^-1₃foes to CCI₄layer, then the change in colour is from

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Purple to brown

Purple to green

Green to brown

Brown to purple

Gases of air, always remains in the random motion and do not settle due to.

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Elastic collision of gas molecules

Unequal number of different gas molecules

Difference impartial pressure of gas molecules

Difference in molecular masses of air gases

Quantum number values for 2p orbitals are.

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n = 2, 1 =1

n =1, 1 = 2

n =1, 1= 0

n = 2, 1 = 0

A real gas obeying Van der Waal's equation will resemble ideal gas if.

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Both a and b are large

Both a and b are small or zero

A is small and b is large

A is large and b is small

The nature of positive rays depends on

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The nature of electrode

The nature of discharge tube

The nature of residual gas

All of the above

Which has reddish brown colour.

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silver acetylide

Copper acetylide

BaSO4

Aqueous KMnO4 solution

Which one of the following compound has octane number 100.

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2,2,4-trimethyl petane

n- pentane

2,4-dimethyl pentane

2- methyl pentane

Which can produce ketone

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Sec alcohol

Calcium acetate

Propyne

All of these

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

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Fiber

Plastic

Varnish

Polyamid resin

Ionic Hydrides react with water to form

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Proton

Hydride ions

Hydroxide ions

Hydronium ions

Which one of the following is not use of chlorine.

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Formation PVC

Formation of mustard gas

Disinfectant and bleaching agent

Formation of sodium chloride

In primary alkyl halides, the halogen atom is attached to a carbon which is further attached to how many carbon atoms

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Two

Three

One

Four

Which one of the followings is not a pollutant.

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CO2

NO2

CO

SO2

Predict the product or reaction.

Acetaldehyde +NaOH

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An aldol

Acetic acid

Ethanol

Paraldehyde

Systematic name of phthalic acid is

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Benzenedicarboxylic acid

Benzene doioc acid

1,2 benzenedicarboxylic acid

o, carboxylic benzoic acid

The fiber which is made from acrylonitrile as monomer

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PVC

Polyester fiber

Rayon fiber

Acrylic fiber