Question # 1

According to Arrhenius concept acid is a substance which dissociates in aqueious solutin to give.

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Proton

Pair of Electron

Hydrogen Ions

Hydroxide ion

Washing clothes at 140 ^oF uses almost the energy as at 140 ^oF wash

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Half

Thrice

Twice

None of the above

When we mvoe from top to bottom in a group atomic size.

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Decrease

Increases

First increases then decreases

None of the above

A complete reaction is in which

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Only 10% reactants covert into products

All the reactants covrt into products

All the reactants do no covrt into products

Half reactants covert into produts

Whcih Isotopes is used for diagonosis of goiter?

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Iodine-131

Cobalt -60

P-32

Sr-90

¹³ C and ¹⁴ C are both present in nature.

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0,1 %

1.1 %

0.9 %

1.5 %

Bond dissocialation for H2 is

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435 kJ/mol

440 kJ/mol

430 kJ/mol

445 kJ/mol

Actinidws belong to period.

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4th

5th

6th

7th

How many electrons can be accommodated at the most in the third shell of the elements.

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8

10

18

32

Numbr of hydrogen atoms present in 18 g of water.

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2 x NA

N_A

3 x N_A

1/2 N_A

An atom having six electonsin its valence shell will achieve noble gas electronic confguration by

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Gainign one electron

Gaining two electrons

Losing all electrons

Losing two electrons

Clark's method is used to remove the hardness of water, in this method which is used.

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Ca(HCO₃)₂

Na-Zeolite

Ca-Zeolite

Ca(OH)₂

The substances formed during the chemical reaction are called.

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Product

Reactants

Radicals

Element

Atmosphere is divided into;

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3 regions

4 regions

5 regions

6 regions

The sphere just above the Earth's surface is.

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Mescosphere

Stratosphere

Thermosphere

Troposphere

Which disease is caused by polluted water.

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Cholera

Typhoid

Diarrhea

All of them

According to Arrhenius concept acid is a substance which dissociates in aqueous solution to give.

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Hydrogen ions

Hydroxide ions

Both a and b

None of these

Traces of acetylene are present in coal gas about.

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0.06 %

0.08%

1.1%

90%

What is the percentage of carbon in anthracite?

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60%

70%

80%

90%

Which organ cause to function during Jaundice?

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Liver

Kindney

Stomach

Large intestine.

Chalco-pyite is an ore of:

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iron

aluminium

silver

copper

Freezing point of water is:

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-4°C

0°C

-36°C

-58°C

An aqueous solution of ethanol in water has vapour pressure.

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Equal to that of water

Equal to that of ethanol

More than that of water

Less than that of water

When a reaction proceeds in a sequence of steps, the overall rate is determined by

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Fastest step

Slowest step

Order of different steps

Molecularity of all steps

Ice float over water because.

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Its structure is diamond like

Its density is maximum at 4 ^oC

It is less dense than water

It has no regular arrangement of molecules.

Tin has Isotopes

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7

9

11

5

More abundant isotope of an element is the one with.

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Even atomic number

Odd atomic number

Even mass number

Odd mass number

The nature of bond in diamond is

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Electrovalent

Metallic

Coordinate covalent

Covalent

The mass fo 1.505 x 10²³atoms of sulphur is.

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0.5 g

0.6 g

0.7 g

0.8 g

The molal boiling point constant is the ration of the elevation in boiling point to

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Molarity

Molality

Mole fraction of solvent

Mole fraction of solute

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

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First order reaction

Second order reaction

Zero order reaction

Third order reaction

Which substances has diffused melting point.

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Crystalline solids

Amorphous solids

Metallic solids

Covalent solids

The cathodic reaction in the electrolysis of dill. H₂SO₄with Pt electrodes is

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Reduction

Oxidation

Both oxidation and reduction

Neither oxidation nor reduction

Which substances is called chrome yellow.

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Pb3O4

PbO

2PbCO3.Pb(OH)2

PbCrO4

Which metal is used in the thermite process because of its activity.

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Iron

Copper

Aluminium

Zinc

Which complex shows zero oxidation state of the transition metal.

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[Fe(CO)5]

K3[Fe(CN)6]

K2[Fe(CN)6]

[Cu(NH3)4]SO4

Which of the following noble gas is used for arc welding and cutting

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Helium

Argon

Xenon

Radon

Which one of the following elements exhibits s-inert pair effect.

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B

Al

Pb

Sc

In which of following processes are small organic molecules made into macromolecules

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the cracking of petroleum fractions

the fractional distillation of crude oil

the polymerization of ethene

the hydrolysis of proteins

An element that has a high ionization energy and tends to be chemically inactive would most likely to be

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An alkali metal

A transition element

A noble gas

A halogen

Which are correct oxidation states for lead

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+1, +2

+3 , +5

+2 ,+4

+4 only

Starch mixture of

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Amylose and xylose

Amylopectin and lactose

Lactose and sucrose

amylose and amylopectin

Which type of coal has greater percentage of carbon.

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Peat

Lignite

Bituminous

Anthracite

Whcih water will be considered as polluted water.

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High value of COD

Low value of COD

High value of DO

Low value of BOD