Question # 1

By electrolytic refining of copper , it is ____________ % pure.

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98

99

99.99

100

The shape of H2O is ________________

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Angular

Linear

Triangular

All of above

First energy level is denoted by:

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K

L

M

N

The earth is made up of ____________ % of aluminum.

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6

7

8

9

In a discharge tube, the pressure of a gas is kept at

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10-2 atm

10-4 atm

10-6 atm

10-8 atm

The most common example of corrosion is:

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Chemical decay

Rusting of iron

Rusting of aluminum

Rusting of tin

T (K) =

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(T) °C + 273

(T) °C -273

(T) °C + 373

(T) °C -373

Which one of the following is brittle?

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Sodium

Aluminum

Selenium

Magnesium

The symbol of lead us

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As

Pb

Sb

Na

Intermolecular forces are of three types and are collectively called ____________

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Nelson' forces

Vander Waal's forces

Neurons

Nil

Metals from a ____________ part of earth on which we live.

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Smaller

Larger

Medium

Nil

The formula of ozone is.

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O₂

O₃

O

CO

the chemical formula of chalcopyrite is:

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Cu₂S

CuFe₂S

CuS

FeS

Lipids are macromolecules made up of.

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Fetty acids

Amino acids

Nucleotides

None of them

The unit of molar concentration:

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mol. dm^-2

mol. dm^-1

mol. dm

mol. dm^-3

Which hydrocarbon molecule would have no effect on the aqueous solution of bromine?

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CH₄

C₁₀H₂₀

C₂H₄

C₂H₂

Reaction which have comparable amount of reactants and products at equilibrium state have.

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Very small Kc value

Very large Kc value

Moderate Kc value

None of these

How many percentage of sunlight is absorbed by atmosphere gases.

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12%

18%

24%

30%

The most important oligosaccharide is:

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Sucrose

Glucose

Fractose

Maltose

The heat capacity of water is.

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4.2 Jg^-1 K^-1

2.1 Jg^-1K^-1

3.2 Jg^-1K^-1

5.9 Jg^-1K^-1

Which carbohydrate is used directly by muscles for energy?

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Galactose

Lactos

Glucose

Fructose

Which one of the following is a synthetic fibre?

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Cotton

Wool

nylon

silk

Molal boiling constant for water is 0.52 ^oC. If 6 g of urea is dissolved in 100 g of water, what will be its boiling point.

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100.52 ^oC

-100.52^oC

100^oC

99^oC

The structure of water molecule is.

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angular

Linear

Trigonal

Trigonal pyramidal

For a given process, the heat change at constant pressure (q_p) and at constant volume (q_v) are related to each other as

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q_p= q_v

q_p< q_v

q_p> q_v

q_p= q_v/2

The optimum temperature for the synthesis of NH3 by Haber's process is.

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200 ^oC

300 ^oC

400 ^oC

500 ^oC

Which one of the following salts dissolved in water to form a solution with a pH lesser than 7

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NaCl

CuSO4

Na2CO3

NH4Cl

At which distance a molecule is present from its neighbor molecules of its own diameter, at room temperature.

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100 times

200 times

300 times

400 times

Half life period for 235 U is

92

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710 million years

810 milion years

720 million years

820 million years

Cathode rays strike alumina and produce a ..........colour.

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Red

Blue

Yellow

Green

The distillation of a solution under reduced pressure is called

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Fractional distillation

Destructive distillation

Distillation

Vacuum distillation

Which molecules is 100% covalent

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H2

H2O

HF

NH3

Which of the following molecules has a co-ordinate covalent bond

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NH₄CI

NaCI

HCI

AICI₃

Which is used in the leather industry

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Borax

Boric acid

Boric oxide

Tetra Boric acid

The fiber in which monomer isCH2=CH-Cl is known as

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Saran fiber

PVC

Rayon fiber

Arcylic fiber

Cannizzaro's reaction is given by

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Acetaldehyde

Formaldehyde

Propanal

Propanone

What product are formed by the oxidative cleavage of 2-butene by alkaline KMnO4.

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Propionic acid and formic acid

Ethanoic acid only

Ethanal only

Water and ethanol

Starch mixture of

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Amylose and xylose

Amylopectin and lactose

Lactose and sucrose

amylose and amylopectin

f-block elements are also called

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non typical transition elements

outer transition elements

normal transition elements

inner transition elements

A single chloride free radical can destroy how many ozone molecules

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100

100,000

100,00

unlimited

which one of the general formula of alkene

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CnH2n

Cn2n+2

CnH2n-2

CnH2n+1

When methane reacts with Cl2 is commonly known as

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Mustard gas

Laughing gas

Phosgene gas

Bio gas

Which is simplest amino acid

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Alanine

Protein

Lysine

Glycine

Acetic acid form a dimer in liquid phase because.

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Low ionization constant of acid

High solubility in water

Hydrogen bonding

Greater polarity