Question # 1

What is formed when oxalic acid is dehydrated by conc. H₂SO₄?

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C + CO₂

CO

CO₂

CO + CO₂

Besides Zn and Cu , German silver contains the metal

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Sn

Ag

Ni

Mg

Iron, once dipped in concentrated H₂SO₄, does not displace copper from copper sulphates solution, because

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It less reactive than copper

A layer of sulphates is deposited on it

An inert layer of iron oxide is deposited on it

All valence electrons of iron are consumed

Electronegativity values of the elements F, CI and Br vary

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F > CI > Br

Br > CI > F

Cl > Br > F

CI > F > Br

Among the following elements which one has the highest value of first ionization potential?

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Oxygen

Argon

Barium

Cesium

The structure of complex hydrides is

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Tetrahedal

Trigonal

Octahedral

Square planar

Sp³hybird orbitals are oriented at an angle of

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107.5°

108.5°

109.5°

103.5°

In an exothermic reaction

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Enthalpy of reactants is lesser than that of products

Enthalpy of reactants is greater than that of products

Heat is transferred form surrounding into the system

Enthalpy of reactants and products same

Which of the following orbitals have a dumb bell shape?

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s

p

d

f

Addition of iron fillings to CuSO₄solution caused precipitation of Cu owing to the

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Reduction of Cu²⁺

Oxidation of Cu²⁺

Reduction of Fe

Reduction of Fe³⁺

96500 C of electricity liberates from CuSO₄solution

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63.5 g of Cu

31.75 g of Cu

96500 g of Cu

100 g of Cu

De halogenatiion of tetrahalides happens in the presence of active metal like

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Zn

Mg

Both a and b

None of them

During the manufacturing process of cement the temperature of the decomposition zone goes up to

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600°C

800°C

1000°C

1200°C

Coinage metals like Au, Pt, Ag and Cu are the least reactive metals and don't liberate H₂gas when treated with acids because

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These have very high positive values of reduction potentials

These have very high negative values of reduction potentials

Their ionization potentials are lowest

Their reduction potentials are close to SHE

For spontaneity of a cell, which is correct?

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ΔG = 0,ΔE = 0

ΔG = -ve ,ΔE = 0

ΔG = +ve ,ΔE = 0

ΔG = -ve

Water which his considered to be safe for human consumption is known as

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Distilled water

Contaminated water

Potable water

Rain water

The main source of natural fibre is

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Animal fibres

Vegetables fibres

Mineral fibres

All of the above

Saturated solution of a solid is prepared at a constant temperature. 100 cm³of this saturated solution is evaporated in a china dish. The mass of the residue is called

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Azetropic mixture

Solubility

Solubility product

Equilibrium constant

Calcium acetate when dry distilled gives

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Formaldehyde

Acetaldehyde

Acetone

Acetic anhydride

Which of the following phenomena will occur when two atoms of the elements having same spin of electron approach for bonding?

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Orbital overlap will not occur

Bonding will not occur

Both (A) and (B) are correct

None of the above are correct

Phenol is also known as

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Acetic acid

Carbolic acid

Tararic acid

Trichloroacetic acid

The unit of specific conductivity is

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Ohm cm^-1

Ohm cm^-2

Ohm^-1cm

Ohm^-1cm^-1

Which of the following is not the reactions of lithium

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Positive particle in discharged tube is produced by ionization of gas molecules, which is caused by

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Gas molecules collide with anode

Gas molecules are at high temperature

Gas molecules produce X-rays

Cathode rays remove electrons from gas molecules

Which of the following forms a toxic substance in blood by combing with hemoglobin?

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Carbon dioxide

Carbon monoxide

Oxygen

Methane

Elements have the tendency to attain 8 electrons in their valence shell. This is known as

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Octer rule

Hunds rule

Pauli exclusion principle

Auf ban principle

Pure water does not conduct electricity because it

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Has low boiling point

Is almost unionized

Is neutral

Is readily decomposed

Which of the following is a typical transition metal

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Sc

Y

Ra

Co

Industrial alcohol may be denaturated by the addition of

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Methyl alcohol

Acetone

Pyridine

Any of the above reagent

Hydrolysis of an ester gives a carboxylic acid which on Kolbe's electrolysis yields ethane. the easter is

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Ethyl methonoate

Methyl ethanoate

Propylamine

Ethylamine

The use of tetra ethyl lead in petrol as an efficient antiknock agent is being discouraged. Which reason is correct

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It is costly

It damages the engine

Pb is difficult to obtain in bulk quantities

The combustion product, lead, causes air pollutions

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