Question # 1

The solubility of which salt decreases with the increase of temperture.

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KNO3

Li2SO4

KCl

NaNO3

The amoutn of energy given out when an electron is added to an eatom is called.

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Electron affinity

Lattice energy

Ionization energy

Electronegativity

A good example of homogeneious mixture is.

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Soil

Ice-Creem

Rock

Wood

Pure alkalis metals can be cut siply by knife but iron cannot bccause of alkali meals have

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Non metalic bonding

Strong metallic bonding

Weak metallic bonding

Moderate metqllic bonding

All metals bear

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Positive charge

Negative charge

Both a and b

None of these

A sub sheel that cna accommodate 6 electrons is

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b

s

f

p

Uni of electron affinity is.

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k J mol-1

k jmol

pm

Newton

How many electrons can nitrogen accept in its outermost shell.

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2

3

4

5

Which of the following contains oxalic acid

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Orange

Sour Milk

Tomato

Tamarind

Platinum alloyed with which metal is used as catalyst in automobiles as atalytic covertor.

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Gold

Rhodium

Palladium

Both a and b

PAN stands for

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Poly aniline nitrate

Proxy acetyl nitrate

Poly acetyl nitrite

Proxy acetyl nitrite

When NaHCO₃is heated if forms:

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CO₂

Ca(OH)₂

CaCO₃

CaO

What is the pOH of Ca(OH)2, 0.02 M Solution.

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1.698

1.397

12.31

12.61

Which one of the not metal.

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Copper

Carbon

chromium

Iron

Oxidation of alkenes produce.

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Glyoxal

Glycol

Oxalic acid

Formic acid

In hydrogenation of vegetable oil catalyst employed is.

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Ni

Pt

ZnO

Cr₂O₃

The carbon contents in lignite is.

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80%

50%

60%

70%

ozone depletion (i.e O3--------------> O2 + O) occurs in:

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lower stratosphere

middle stratosphere

upper stratosphere

troposphere

Arrhenius presented his concept about acids and bases in.

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1785

1787

1923

1930

Which one of these protects us against the disease;

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Carbohydrates

Lipids

Proteins

all of these

Total pressure of mixture of two gases is.

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The sum of their partial pressures.

The difference of their partial pressures

The product of their practical pressures

The ratio of their partial pressures

When small amount of acid or base is added to buffer, its pH.

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Remain same

Always increases

Always decreases

slightly increases or decreases

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

Bohr's model of atom, is contradicted by.

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Planck quantum theory

Pauli's exclusion prinsciple

Heisenberg's uncertainty principle

All of the above

Which of the following has coordinate covalent bond.

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NH4

NaCl

HCl

AlCl3

Chromatographic technique is very useful for

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Isolation

Purification

separation

All of them

A type of meals are usually used as catalyst.

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Coinage metal

Alkali metals

Transition metals

alkaline earth metals

If uncertainty in position of electron is zero, the uncertainty in its momentum would be.

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zero

Less than zero

Infinite

One

The unit of rate constant is the same as that of the rate of reaction is.

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First order reaction

Second order reaction

Zero order reaction

Third order reaction

Which of the following molecules have unpaired electrons is the bonding molecular orbitals.

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N2

O2

B2

F2

In which group, melting point and boiling point increase downward in a group

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IA

II A

VII A

Both a and b

Bleaching powder contains available chlorine approximately

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100%

70-80%

35-40%

10-20%

The disease can be eradicated by using pesticides.

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Malaria

Yellow fever

Sleeping sickness

All of these

During the manufacturing process of cement the temperature of the decomposition zone goes up to.

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600 ^oC

900 ^oC

1000 ^oC

1200 ^oC

Which substance is used to consulate rubber latex

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Ethyl alcohol

Acetaldehyde

Acetic acid

Water

Which one of the following macromolecules contains carbon, hydrogen, nitrogen and oxygen in it.

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Nylon-6,6

Terylene

Starch

Bakelite

Fluorine is in group VIIA of periodic table. Its chemistry will most closely resembles that of.

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Argon

Boron

Iodine

Sulphur

In modern periodic table VI period contains elements

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8

18

10

32

Which one is neutral amino acid

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Lysine

Histidine

Glutamic acid

Valine

Which one of the following gases is used for artificial ripening of fruits

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Ethene

Ethyne

Methane

Propane