Question # 1

Atmosphere of big/metropolitan cities is polluted most by

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Automobile exhausts

Pesticide residue

Household waste

Radio-active fall out

The rate of a reaction can be increased in general by all the factors except by

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Using a catalyst

Increasing temperature

Increasing the activation energy

Increasing the conc. of reactants

Which of the following alkali metal hydroxides is the strongest base?

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LiOH

NaOH

KOH

CaOH

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

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Bonding behaviour

Electronegativity

Ionisation potential

Neutron/proton ratio.

The number of unpaired electrons in the P-subshell of oxygen atom

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1

2

3

4

Which of the following units represents largest amount of energy?

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Calorie

Joule

Erg

Electron vol.

Sea weeds are important source of

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Iron

Chlorine

Iodine

Bromine

Which of the following with aqueous KOH will give acetaldehyde?

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1,2-Dichloroethane

1, 1-Dichloroethane

Chloroacetic acid

Ethyl chloride

Inert pair effect plays an important role in case of

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F

AI

Si

TI

Fluorine does not show positive oxidation states due to the absence of

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d-orbitals

s-orbitals

p-orbitals

None

Which of the following has linear shape?

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SP

SP²

SP³

None of the above

How many moles of Helium gas occupy 22.4 L at 0°C at a atm. Pressure?

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0.11

0.90

1.0

1.11

Heating a mixture of sodium benzoate and soda lime gives

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Methane

Benzene

Sodium benzoate

Calcium benzoate

The total number of protons in 10 g of calcium carbonate is (N₀= 6.023 x 10²³)

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1.5057 x 10²⁴

2.0478 x 10²⁴

3.0115 x 10²⁴

4.0956 x 10²⁴

Causticisation process is used for the preparation of

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Caustic soda

Caustic potash

Baryata solution

Slaked lime

Setting of cement is an

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Exothermic reaction

Endothermic reaction

Neither exothermic nor endothermic

None

Which quantum number is sufficient to describe the electron is hydrogen

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ι

n

m

s

If N_Ais Avogadro's number, then number of valence electrons in 4.2 g of nitride ions N^3-is

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2.4 N_A

4.2 N_A

1.6 N_A

3.2 N_A

The main structure features of proteins is

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An ester linkage

An ether linkage

The peptide linkage

All

Among alkali metal salts, the lithium salts are the poorest conductors of electricity in aqueous solution because of

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Easy diffusion of Li⁺ions

Lower ability of Li⁺ions to polarize water molecules

Lowest charge to radius ratio

Higher degree of hydration of Li⁺ions

The principal constituent of pyrex glass

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Zn

B

Pb

Cl

During the folding of filter paper the apex form angle of about

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80°

60°

180°

90°

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