Question # 1

Air is an example of:

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Gas in gas

Solid in gas

Liquid in gas

Gas in ;iquid

In 9th century scientist accepted by:

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Dalton

Bohars

Rutherford

Nil

Which one of the following is a galvanic cell?

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Daniel cell

Nelson's cell

Down's cell

Both B and C

At ____________ °C water converts to ice.

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101°

100°

99°C

100.2°C

The bond between two atoms will be ionic if the difference between their electronegativities is:

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Less than 1.7

Greater than 1.7

Zero

Less than 1.2

The absolute zero means:

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273.15 °C

-273.15 °C

0 °C

-373.15 °C

The mathematical formula of Boyle's law is:

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PV = k

PT = k

V = kT

T = Vk

The unit of Molarity is :

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Molar

Volume

Both

Nil

Diamonds is ____________

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Soft

Hard

Bulky

Nil

H° - H° has ________________ energy.

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Lower

Higher

Medium

Nil

The fundamental unit of elements is ___________

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Molecule

Atom

Matter

Mixture

Halogenation of methane on the presence of diffused sunlight takes place.

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Only in one step

Slowly in one step

Freshly in two steps

In a series of four steps

A substance which can behave as an acid as well as a base is called.

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Acid

Base

Amphoteric

Neutral

The order or reactivity of hydrogen halides with alkenes is.

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HI/Br

HBr > HI

HCl > HBr

HBr>HCl

Which one of the following is not an air pollutants?

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Nitrogen

Carbon dioxide

Nitrogen oxide

Ozone

Organic compounds contain:

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ionic bond

Covalent bond

Metallic bond

Co-ordinate covalent

Conversion of wood into coal is called.

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Carbonization

Destructive distillation

Fractional distillation

All

The region in which ozone layere depletes is called.

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Ozone hole

Black hole

Both of them

None of them

The accumulation of which vitamin causes bone like deposits in the kidney.

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Vitamin D

Vitamin E

Vitamin B

Vitamin A

The reaction in which the number of moles reactants and products not equal in balance chemical equation the units of Kc for this reactions are

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mol^-2

dm³

mol²

mol dm^-1

In dry cleaning, which chemical is used.

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Chloroform

Carbon tetachloride

Ecetaldehyde

Ethanol

Permanent hardness is removed by adding.

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Na₂ zeolite.

Soda lime

Lime water

Quick lime

The cathodic reaction in the electrolysis of dil H2SO4, with pt electrode sis.

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Reduction

Oxidation

Both oxidation and reduction

Neither oxidation nor reduction

18 g glucose is dissolved in 90 g of water. The relative lowering of vapour pressure is equal to.

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1/5

5.1

1/51

6

Spectrum produced due to the transition of electron from M-Shall to L-Shell is.

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Absorption

Emission

Continuous

X rays

Which of the following mixtures of liquids show negative deviation

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Methyl alcohol water

Hydrochloric acid water

Carbon di sulphide chloroform

Chlorobenzene bromobenzene

The reduction potential of Zn is.

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+0.76 V

-0.34 B

+0.34 V

-0.76 V

An excess of aqueous silver nitrate is added to aqueous barium chloride and precipitate is removed by filtration. What are the main ions in the filtrate

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In cubic and hexagonal closest packing which layer has different arrangement.

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First

Second

Third

Fourth

Which of the following will have highest rate of diffusion

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O2

CO2

NH3

SO2

Which of the following species has unpaired electrons in anti bonding molecular orbitals

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O2

N2

B2

F2

The diffusion of gases at absolute zero will be

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Unchanged

Zero

slightly decreases

Slightly increases

More ideal gas at room temperature is.

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CO2

NH3

SO2

N2

Dennturing of protein is

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Hydrolysis of protein

Unfolding of protein

Three dimensional twisting and folding of peptide chain

Developing hydrogen bonding in peptide chain

Which substance is used for silvering of mirror.

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Acetaldehyde

Ethanol

Ethylene glycol

Acetone

Main source of aromatic compound is

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Petroleum

Coaltar

Living organisms

Dead marine animals

Which acid can not be stored in glass bottles.

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HCl

HF

H2SO4

HNO3

Element of which group are called non typical transition elements.

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IB

II B

II A

VII B

Aromatic hydrocarbons are the derivatives of

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Normal series of paraffins

Alkene

Benzene

Cyclohexane

The oxides of beryllium are

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Basicity

Rancidity

Amphoteric

none of all

Which of the following statement is correct

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Na atom is smaller than Na⁺

Na atom is larger than K atom

F atom is smaller than F^-

F atom is larger than F^-

Group VI-B of transition elements contains

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Zn, Cd, Hg

Fe, Ru, Os

Cr, Mo, W

Mn, Te, Re

The anhydride of HCIO₄is

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CIO

CIO₂

CIO₃

CI₂O₇

Which one of the following acids acts as oxidizing agent but never a reducing agent.

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HCIO

HCIO2

HCIO3

HCIO4