Question # 1

Which of following is primary pollutants

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N₂O

PAN

H₂SO₄

None of these

How many grams of NaOH are present in 250 cm3 of its 0.2M solution

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,4 g

, 0.4 g

, 10 g

, 2 g

Bragg's law is given by equation

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n λ = 2 θ sin θ

nλ = 2 d sin θ

2nλ = d sin θ

n λ= 1/2 d sin θ

The specie that develops strongest hydrogen bonding with water

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НСООН

B.CH3CH2СООН

CH3СООН

CICH2COOH

Which element differs from rest of elements of its group?

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Ba

Mg

Ca

Be

Which one of the following is an organic compound?

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Calcium carbide

Calcium cyanide

Carbon disulphide

None of these

Ph of unpolluted rain water is

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07

Less than 6

5.6

Less than 5

Chemical equilibrium involving reactants and products in more than one phase is called:

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Homogeneous

Heterogeneous

Dynamic

Static

Formalin contains-------% alcohol.

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37

80

8

52

4.4 g of CO₂ contains how many litres of CO₂ at STP?

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2.4 litre

2.24 litre

44 litre

22.4 litre

Lithosphere has amount of silicon

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35.30%

27.72%

40.01%

21.13%

Which of the following process is employed to convert alkyl halide into alcohol?

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Addition

Substitution

Dehydrohalogenation

Molecular rearrangement

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Plastics are a pollution problem because many plastics:

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Are made from petroleum

Are very inflammable

Burn to produce toxic fumes

Decompose to produce toxic products

The clotting time of blood is increased due to the deficiency of

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Vitamin A

Vitamin K

Vitamin D

Vitamin C

Ionic radius, in a period from left to right

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Increases

Decreases

Decreases then increases

Increases and decreases

Which of the hydrogen halides has the highest percentage of ionic character

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HCl

HBr

HF

HI

The osmotic pressure of a dilute solution is directly proportional to the

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Diffusion rate of the solute

Ionic concentration

Elevation in boiling point

Flow of solvent from a concentrated to a dilute solution

One mole of SO₂contains

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6.02 x 10²³atoms of oxygen

18.1 x 10²³, molecules of SO₂

6.02 x 10²³atoms of sulphur

4 gram atoms of SO₂

[Ti(H₂O)₆]⁺³ion absorbs colour:

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Blue

Yellow

Green

Red

The monomeric units of starch is/are

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Glucose

Fructose

Glucose and fructose

Mannose

Which of the following sets of atomic numbers belong to that of the alkali metals?

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1,12,30,4,62

37,19,3,55

9,17,35,53

12,20,56,88

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