Question # 1

Surfactants are organic compounds used in detergents which reduce the:

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viscosity of water

surface tension of water

boiling points of water

surface ability of water

A single chloride free redical can destroy bow many ozene molecules?

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100

100000

10000

10

CFCs destroy ozone layer. How many ozone molecule a chlorine free radical can destory

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50,000

10,000

20,000

None of these

Which of the following carbohydrates is used in silvering of mirrors

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Sucrose

Cellulose

Fructose

Glucose

Which of the following are thermoplastic materials?

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PVC (poly vinyl chloride)

polystryences

polyethylene

all above

LiF is a crystalline substance and has

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ionic crystal

metallic crystal

covalent crystal

molecular crystal

Which of the following statement about graphite is not true?

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The coordination number of carbon atoms is 4.

the carbon atoms are arranged layers.

the layers in graphite are attracted to each other weak forces.

the corbon atoms use only three of their four outer electrons for covalent bonding.

The value of van der Waal s constant a for gases CO₂, N₂, and SO₂, are 3.59 ,1.39, 1.36, and 6.17 atm dm⁶ mol^-2respectively the gas which can be most easily liquefied is

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CO₂

O₂

N₂

SO₂

Lithosphere extends upto kilometer of earth crust in depth:

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10 km

100 km

1000 km

10000 km

Ice floats on water because

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the hydrogen bonding in ice is stronger than that of in water

empty spaces are left in ice

ice has two-dimensional structure

the bond length of the oxygen and hydrogen bond is different in water and ice

Which of the following metal oxides is antiferromanetic in nature?

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MnO₂

TiO₂

NO₂

CrO₂

The order of reactivity for a given halogen in Grignard's reagent is:

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CH₃X > C₂H₅X > C₃H₄X > C₄H₄X

C₂H₅X > C₃H₇X > C₄H₅X > CH₄X

C₃H₇X > C₄H₇X > CH₃X > C₂H₅X

C₄H₄X > C₃H₇X > C₂H₅X > CH₄X

Variable valency is generally exhibited by

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Normal elements

Transition elements

Metallic elements

None of these

An organic acdi having molecular formula C₂H₄O₂is

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Formic acid

Acetic acid

Oxalic acid

Propionic acid

Ionic radius, in a period from left to right

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Increases

Decreases

Decreases then increases

Increases and decreases

Which element belong to 5d series

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V

Nb

Pd

Hf

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1

2

3

4

Nitration of phenol gives

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o-nitrophenol

p-nitrophenol

m-nitrophenol

Both o and p-nitrophenol

Which of the following salt is soluble in water

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CaCO₃

CaSO₄

MgSO₄

BaSO₄

A compound X contains 50% sulphur and 50% oxygen by mass. What is the empirical formula of compound X?

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SO

SO₂

SO₃

SO₄

The alkynides are used for the ----------- of alkynes

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Pxperation

Purification

Seperation

All of above

Rutherford's model of atom failed because:

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The atom did o have a nucleus and electrons

It did not account fro the attraction b/w protons and neutrons

It did no account for the stability of the atom.

There is actually no space b/w the nucleus ad the electrons.

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