Question # 1

In which of the following elements +1 oxidation state is more stable than +3

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B

AI

Ga

Ti

Saturated solution of NaCI on heating becomes

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Super saturated

Unsaturated

Remains saturated

None

Which is the most amphoteric?

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Na₂O

MgO

AI₂O₃

CaO

Which of the substances Na, Hg, S Pt and graphic can be used as electrodes in electrolytic cells having aqueous solution?

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Na,Pt and graphite

Na and Hg

Pt and graphite only

Na and S only

Hess's law deals with

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Changes in heat or reaction

Rate of reaction

Equilibrium constant

Influence of pressure on volume of a gas

The addition of HBr is easiest with

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CH2 = CHCI

CICH = CHCI

CH3 - CH = CH2

(CH3)2 C = CH2

Which of the following process is used to separate insoluble particles from liquids?

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Separation

Filtration

Crystallization

Condensation

By using the fluted filter paper rate of filtration is

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Increased

Decreased

Filtration is constant

Having no effect

In a reversible chemical reaction having two reactants in equilibrium if the concentration of the reactants are doubled then the equilibrium constant will

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Also be doubled

Be halved

Becomes one fourth

Remains the same

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

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d-orbitals

s-orbitals

p-orbitals

None

Carbon monoxide is pollutant as it

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Inactivates nerves

Inhibits glycolysis

Combines with oxygen

Combines with hemoglobin

Which has largest first ionization energy?

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Li

Na

K

Rb

Benezene is obtained by fractional distillation of

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Heavy oil

Anthracene oil

Middle oil

Light oil

Acetic anhydride is obtained from acetyl chloride by the reaction of

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P₂O₅

H₂SO₄

CH₃COONa

CH₃COCH₃

Water (H_2O) is liquid while hydrogen sulphide (H₂S) is a gas because

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Water has higher molecular weight

Hydrogen sulphide is a weak acid

Sulphure has high electronegativity than oxygen

Water molecules associate through hydrogen

By using the fluted filter paper rate of filtration is

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Increased

Decreased

Filtration is constant

Having no effect

Formic acid is obtained when

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Calcium acetate is heated with conc. H₂SO₄

Calcium formate is heated with calcium acetate

Glycerol is heated with oxalic acid

Acetaldehyde is oxidized with K2Cr₂O₇ and H₂SO₄

Which of the following mineral does not contain Al?

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Cryolite

Mica

Feldspar

Fluorspar

Number of elements present in the fifth period of periodic table is

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8

10

18

32

Chile salt petre is

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NaNO₃

Na₂SO4

KNO₃

Na₂S₂O₃

Minamata disease is due to pollution of

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Organic waste

Oil spill in water

Industrial waste containing mercury into fishing water

Arsenic into the atmosphere

A certain current liberate 0.5 g of hydrogen in 2 h. How many grams of copper can be liberated by the same current flowing for the same time in a copper sulphate solution?

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12.7 gm

15.9 gm

31.8 gm

63.5 gm

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