Question # 1

O3, Ozone is _________ molecules.

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Homoatomic

Hetroatomic

Monoatomic

Nil

The molecular mass of water is

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16 amu

14 amu

18 amu

20 amu

________________ are formed from chemical reactions.

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Elements

Mixture

Substance

Nil

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

According to Bohr, electrons can revolve only in this orbits whose angular momentum is

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h/2π

n 2h/π

n h2/2π

n h/2π

The types of solutions on the basis of their physical states are

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3

6

9

12

____________ agents gains electrons in chemical reaction.

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Reduction

Oxidation

Both

None of these

Mass per unit volume is:

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Velocity

Dencity

Pressure

Nil

Elements are represented by chemical _________

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Abbreviation

Unit

Symbols

It can be represented

The example of solid solute in gas solvent is

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butter

Sugar in water

Smoke in air

Opals

A heterogeneous mixture of different substance are called:

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Solution

Suspension

Colloids

Nil

When the reaction causes to produced it is called.

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Chemical equlibrium state

Static equilibrium

Dynamic equilibriiun

All

Concentration is a .

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Mixing technique

Separating technique

Boiling technique

cooling technique

The salts of which element are present in detergent that causes the rapid growth of algae in water bodies is.

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Phosphate

Calcium

Sodium

All of them

The source of galactose.

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Fruits

Vegetables

Cereals

All of them

Some organic compound are soluble in water due to the presence of .

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-OH

H⁺

Botha a and b

Covalent bond

The heat capacity of water is greater than rocks.

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4 times

5 times

6 times

7 times

Earth has natural systems.

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One

Two

Three

Four

Which disease is caused by polluted water.

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Cholera

Typhoid

Diarrhea

All of them

Which one of the following are amorphous solids?

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Monosacchrides

Oligosaccharides

Polysaccharides

All of them

Functional group of Alcohols is

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-COOH

-C=0

C-O-C

-OH

Chemical formula for urea is:

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NH4CNO

NH4CH

NH2CONH2

NH4CI

The number of H2O molecules in 9 grams of ice is

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3.01 x 10²³

6.02 x 10²³

6.02 x 10⁸

12.04 x 10²³

The pH of human blood is

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7.0

7.4

4.0

6.5

What type of bonding is present in NH4Cl

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Ionic

Covalent

Co ordinate covalent

All of these

A limiting reactant is one.

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Which is present in least amount

Which produces minimum number of moles of product

Which produces maximum number of moles product

Does not effect the amount of product.

The Rutherford experiment of using a stream of alpha particles on a piece of gold foil proved that.

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The atom was a solid sphere

The atom had electron

The atom had neutrons

The atom had a great empty space in it

When hot saturated solution is cooled very rapidly, we get

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Medium sized crystals

large sized crystals

Premature crystallization of the substance

Old crops of crystals

Which properties of liquid is measured by polarimeter

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Conductance

Refractive index

Optical activity

Change in volume

Which of the following value of heat of formation indicates that the product is least stable.

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-94 KJ

-231.6 KJ

+21.4 KJ

+70 KJ

In methanol, bond between carbon and oxygen.

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Ionic

Non polar

Polar

Co - ordinate

When atoms are subjected to strong electric field, splitting of spectral lines is called.

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Zeeman effect

stark effect

Photoelectric effect

Compton effect

Which one of the following molecule have angle of 120 ^o

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Be Cl2

BF3

CH4

NH3

What are the total numbers of periods in the modern periodic table.

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3

5

7

8

Which one of the following elements commonly exhibits oxidation states of +6 and +3 in aqueous solution.

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Na

Cr

Mg

C

Al reacts with caustic soda to form

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Sodium aluminates

Aluminium hydroxide

Aluminium oxide

sodium tetra aluminate

The element of 2nd period, which has highest ionization energy from the following is

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Be

C

N

O

the percentage of nitrogen in NH3 is

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46%

60%

82%

100%

Which one of the following gases is used welding purpose usualy.

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Methane

Ethane

Ethene

Acetylene

Which compound shows maximum hydrogen bonding with water.

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CH3OH

C2H5OH

CH3-O-CH3

C6H5OH

Bone ash contain calcium phosphate

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40%

50%

70%

80%

Elimination biomolecular reactions involve.

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First order kinetics

Second order kinetics

third order kinetics

Zero order kinetics

What is %age of calcium phosphate in bone ash

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20

40

80

60

Which of the following species is ortho and para director.

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CHO

SO3H

NO2

Cl