Question # 1

What water freezes at 0∘ , Its density decreases dues to:

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cubic structure of ice

empty spaces present in the structure

change of bond lengths

change of bond angles

in diamond a unit cell is tetrahedral and averall crystai structure is

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face centred cubic

body centred cubic

tetrahedral

hexagonal

SO₂and NO₂cause pollution due to increase in

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Buffer action

Basicity

Acidity

Neutrality

Ethane when completely halogenated in excess of chiorine can form

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Hexachloroethane

Dichloroethane

Pentachloroethane

1.1.2.2-terachloroethane

By increasing temperature,the transition from a gas to an ionized gas gives free electrons called:

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UV radiation

gas phase

plasma

vapour density

The gasses in the atmosphere are essential for sustaining life on earth; Thus oxygen is required for breathing, What for is carbon dioxide required?

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to help plant to under go photosynthesis

to destroy nitrogen oxide form the atmosphere

to help to clean to atmosphere

to help in fixing of bacteria

Which of the following is electrophile for alkylation?

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NO+2

SO3

R+

Both a & b

Rte of evaporation of petrol is greater than that of water at room temperature. This is due to the reason that:

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petrol is an organic compound

water molecules have small size

petrol molecules do not have

petrol molecules have greater size

pH value of pepsin is:

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3

2

4

1.4

If an endothermic reaction is allowed to take place very rapidly in air, the temperature of the surrounding air will

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Remains constant

Increase

Decrease

Either increase or decrease

One Joule is equivalent to

Which of the following is BLOOD iron carrier

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Haemoglobin

Albumin

Transferrin

Globulin

Phosphine is not obtained by the reaction when

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White P is heated with NaOH

Red P is heated with NaOH

Ca₂P₂reacts with water

PH₄l is boiled with water

Standard reduction electrode potential of three metals A, B and C are erespectively + 0.05 V, -3.0 and -1.2V. The reducting power of

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B > C > A

A > B > C

C > B > A

A > C > B

Which is a weak nucleophile

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OH^-

Br^-

NH₃

CI^-

Which of the following species has the highest ionization potential?

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Ne

Al⁺

Mg⁺

Li⁺

Charge of an electron is:

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1.6 x 10^-19 C

9.1 x 10^-34 C

1.7588 x 10¹¹ C

6.62 x 10^-34 C

Which of the following does not reflect the periodicity of elements?

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Bonding behaviour

Electronegativity

Ionisation potential

Neutral/proton ratio

Major component in cement is :

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SiO₂

Lime

Al₂O₃

MgO

The saturated hydrocarbons usually end with suffix ______

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Ane

Ene

Yne

Oic

Which of the following statement about fluorine is not correct?

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Electron affinity of chlorine is greater than that of fluorine

Bond energy of fluorine is less than that of chlorine

Fluorine cannot be prepared by electrolysis of fused metal fluorides

Fluorine does not form oxoacid

The fiber which is made from acrylonitrile as monomer:

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PVC

Rayon Fiber

Acrylic fiber

Polyester fiber

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

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HCl

HBr

HF

Hl

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