Question # 1

The collision which results in chemical reaction

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Effective collision

Ineffective collision

Useless collision

All of the above

The range of UV-B is:

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320 to 400 nm

200 to 280 nm

280 to 320 nm

50 to 400 nm

Which gases are produced from landfills?

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NH₃

H₂S

N₂

All of these

Compound X & Y give effervesce with Na2CO3, solution. X gives a white ppt with ammonical AgNO3 while Y gives sweet smell compound on heating with alcohol X &Y are

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Formic acid & acetic acid

Acetone & formic acid

Acetaldehy de & acetic acid

Acetic acid & acetone

Dipole-induced dipole forces are also called

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dipole-dipole forces

ion-dipole forces

Debye forces

London-dispersion forces

Surface and ground water sources are contaminated by various human activities which of the followings is not a human activity that causes contamination in fresh water

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live stock waste

oil leaks and spills

disposal of industrial effluents

rain

Which is not the condition for the formation of smog

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there must be sufficient NO gas

there must be sunlight to help photo chemical reactions to take place

air must be blowing swifty

there must be SO₂in the air

Lithium differs from rest of members of its group due to which of following reasons

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High E.N of Li+1

Small radius

High charge density

All above are correct

The maximum possible number of hydrogen bonds in which a H₂O molecule can participate is

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1

2

3

4

The order of reaction provides valuable information about of reaction

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Condition

Concentration

Mechanism

Parameters

Why a C - Cl bond breaks by uv light

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Cl is most electronegative

Cl is volatile

C - Cl bond energy is smaller than that of C - H bond energy

Uv light provides energy which is sufficient to break C - Cl bond and not C - H bond

Which statement is correct for the fuel cells

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These cells operate at low temperature

No catalyst used for the formation of water

MnO₂is used as electrolyte

Dehydration of allcohol gives:

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Alkane

Alkene

Aldehyde

ketone

Rates of organic reactions are

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Fast

Very fast

Slow

Non-reactive

The valence orbital configuration of an element with atomic number 23 is

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3d⁵

3d³, 4s²

3d³, 4s¹, 4p¹

3d²,4s²,4p¹

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4 mole per dm³

2 mole per dm³

0.33 mole per dm³

0.67 mole per dm³

Closed chain compound can be classified into

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Homocyclic

Hetrocyclic

Aliphatic

Both a and b

Which have better penetrating power

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Alpha rays

Beta rays

Gamma rays

X-rays

95% ethanol is called:

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Rectified other

Diesel

Rectified spirit

Petrol

Complete combustion of alkane yields

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CO₂+ H₂O

CO₂+ heat

CO + H₂O heat

CO₂+ H₂O + heat

In electrolytic cells, the chemical changes may be :

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Either spontaneous or non-spontaneous

Always spontaneous

Always non-spontaneous

More spontaneous and less non-spontaneous.

Spraying of DDT produces pollution of

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Air

Air and water

Air and soil

Air, water and soil

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