Question # 1

The main pollutant of leather in the waste water is due to the salt of:

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Lead

Chromium (VI)

Copper

Chromium (III)

Transformation is a cyclic process in which used plactic is

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Remelted and styrene is added

Converted into low quality substance

Converted back into original components

None of these

The rate of diffusion of two gases are inverselly proportional to the square roots of their densities or molecular weights, is a statement of

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Charle's Law

Boyle's Law

Graham's Law

Dalton's Law

Which one of the following is not true of metallic bonding?

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it gives rise to excellent electrical conductivity

electrons are following to move throughout the structure

the strength of metallic bonds increases down a group

the strength of metallic bonding affects the boiling point of metals

In metallic crystals the atomic orbitals combine to produce a large number of closely bands of energy according to

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electron pool theory

molecular orbital theory

valence bond theory

electrostatic force of attraction

Geometry of NH3 is

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^Tetrahedral

Square planer

Pyramidal

Linear

Oxidation of secondary alcohol produces

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Aldehyde

Ketone

Alkyl halide

Ester

Example of essential aromatic amino acids

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Theronine

Alanine

Phenyl alanine

Glycine

Contamination of Hg comes into surface water from chlor industrial wastes. Why is Hg toxic

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It attaches to sulphur of the disulphide link

Hg is a heavy metal

Hg is liquid at room temperature

Hg is reactive chemically

Which of the following pairs of not form a dative covalent bond to each other?

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NH₃ and H⁺

H₂O and H⁺

NH₃ and BF₃

CH₄ and AICI₃

When light is exposed to transtion element, then electrons jump from lower orbitals to higher orbitals in

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Orbitals of s-subshell

Orbitals of d-subshell

Orbitals of p-subshell

between different shells

The total number of possible values of magnetic quantum number for the value of l=3 is

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3

1

5

7

Catalytic oxidation of alkanes is used for the preparation of

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Adehydes

Fatty acid

Carbonyylic acids

Ketones

The freezing point of 1 molal NaCl solution assuming NaCl to be 100% dissociated in water in

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-1.86°C

-3.72°C

+1.86°C

+3.72°C

All the elements of oxygen family are

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Non metals

Metalloids

Radioactive

Polymorphic

Which of the sub-atomic particles is not charged

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Electron

Proton

Neutron

All of them

What are alloys

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A homogenous mixture of two or more elements

A homohenous mixture of metal and a non-metal

A homogenous mixture of two or more metals

None of the above

Homogenous catalysis is that in which catalyst and reactants are in same phase. Which one of the following reaction is a homogenous catalysis

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Which behaves as insulator for animals body?

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Carbohydrates

Proteins

Fats

Skin

Which of the following statements is no correct regarding bonding molecular orbitals?

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Bonding molecular orbitals possess ls energy than atomic orbitals from which they are formed.

Bonding molecular orbitals have low electron density between the two nuclei.

Every electron in bonding molecular orbitals contributes to the attraction b.w atoms.

Bonding molecular orbitals are formed when the electron waves undergo constructive interference.

Which of these polymers is a synthetic polymer?

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Animal fat

Starch

Cellulose

Polyester

Aqueous solution of glucose C₆H₁₂O₆, boils at 100.052°C. The solution contains

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180 grams glucose in 1 kg water

18 grams glucose in 1 kg water

1.8 grams glucose in 1 kg water

3.6 grams glucose in 1 kg

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