Question # 1

Grey tin crystals belong to

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tetragonal

cubic

orthorhombic

rhomtrohedral

Ecosystem is a smaller unity of

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Nydosphere

Biosphere

Lithosphere

Attmosphere

Li resembles with Mg, because

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the ratio of their charge to size is nearly the same

both have nearly same size

both are metallic in nature

both are found together in nature

In which of the following processes the liquids are made to boil at low temperature

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Vacuum distillation

Destructive distillation

Distillation

Vacuum destructive distillation

Which of the following compound shows the geometrical isomerism

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2-butene

2-butyne

2-butanol

Butanol

Which one of the following enzymes brings about the hydrolysis of fats?

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urease

maltase

zymase

lypase

Plastic are a pollution problem because many plastics

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Burn to produce toxic fumes

Decompose to produce toxic products

Are made from petroleum

Are very inflammable

Which of the following statement is not correct for glycogen

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It is main storage of carbohydrates

It structure does not resemble Amylopectin

It has 1 → 4 and 1 → 6 glycosidic linkage

On hydrolysis it yields glucose units

One molecule of gas is approximately Distance______ times its own diameter from its neighbour at room temperature.

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30

3000

3

300

Covalent solids are composed of

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Ions

Different molecules

Neutral atoms

Diethyl ether

Carboxylic acid is given name by replacing "a" of alkane by:

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"oic" acid

"one"

"al"

"ol"

The orbital in Rutherford's model is

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Spiral

Circular

Both

None

Factors affecting quality of water:

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D.O

BOD

COD

All of these

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0.5

4.0

2.5

0.25

Ethyl acetate is obtained when methyl magnesium iodide reacts with

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Ethyl formate

Ethyl choroformate

Acetyl chloride

carbondioxide

Sodium should be stored in

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Air free from moisture

Air free form carbon dioxide

Under water

Under kerosene oil

Which of the following molecules has zero dipole moment>

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NH₃

CHCl₃

H₂O

BF₃

Which statement is incorrect for and ideal solution

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The forces of attractions between solute and solvent molecules are same

There is no evolution or absorption of heat

Volume of the solution is less than sum of volumes of individual components

Vapour pressure of solution is directly proportional to the mole fraction of solvent

In a group form top to bottom, the hardness of alkali metals

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Remains unchanged

Increases

Decreases

None

Write the name of following alkene CH₂= CH - CH = CH₂

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1,3 butadiene

Butra -1, 3-diene

Both a & b

None

Which of the following is a typical transition metal

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Sc

Y

Ra

Co

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Cu

H

N

O

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