Question # 1

Ozone depletion in stratosphere will result in

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Forest fires

Increased incidence of skin cancer

Global warming

None of the above

Copper is resistant to

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Air

Water

Acid and Alkali

All of the above

Which is the strongest reducing agent.

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HF

HCl

HBr

HI

Commercial or the phosphoric acid is pure.

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37.0%

82.98%

88.25%

90.12%

Which of the following statements is not correct regarding electromagnetic spectra?

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The frequency of microwave is less than uv

The velocity of X-rays is more than uv

Cosmic rays have shorter wave length than radio waves.

The frequency of uv is greater than visible rays.

Fluorine does not show variable oxidation state because of.

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its high electronegativity

Its small sixe

low dissociation energy of F-F bond

Non availability of d-orbitals

Bromine is used as

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Fungicides

Herbicides

Germicides

Insecticides

What is clinker.

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Roasted calcareous material

Roasted argillaceous material

Roasted calcareous and argillaceous material

Roasted gypsum

Which of the following statements is false about enantiomers.

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Rotate plane of polarized light

Are superimposable mirror images

Nbonsuperimposable mirror images

All of the above

The full form of STM is

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Scanning Tunneling Microscope

Scientific Technical Microscope

Systematic Technical Microscope

SuperTensile Microscope

Which of the following interaction is the strong.

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Dipole -dipole

Ion induced dipole

Ion -dipole

Dipole induced diple

Maximum desirable concentration of fluorides according to international standard is.

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10-100 ppm

1 ppm

100-200 ppm

10-20 ppm

Which of the following is not an androgen i.e. male sex hormones.

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Androsterone

Testosterone

Oestrone

All of these are make hormone

A unit cell having dimension , a = b c, alpha, beta, gama = 90^o is known as.

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Cubic

Hexagonal

Orthorhombic

None of them

Formula of orthophosphoric acid

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H2PO4

H3PO2

H2P2O5

Aluminum is an active metal but does not corrode as iron does because.

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Ai does not react with O2

A protective layer of Al2 O3 forms on the metal surface

AI is harder to Oxidize than is Fe

Aluminium has a high tensile strength

The correct order of second ionization potential of carbon nitrogen, oxygen and fluorine is.

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C > N > O > F

O > F > N > C

O > N > F > C

F > O > N > C

Calander stock is a process in paper making in which.

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Thickness of the paper is reduced

Surface of paper is made smooth

Moisture is removed

Both A and B

The cooling of molten urea by air in the tower is called.

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Prilling

Evaporation

Condensation

Distillation

Which of the following symmetry element leaves the molecule or an object unchanged.

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Proper rotation

Improper rotation

Inversion axis

Identity

Which of the following pair on aldol condensation followed by dehydration gives methyl vinyl ketone.

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HCHO and CH3COCH3

HCHO and CH3CHO

CH3CHO and CH3CHO

CH3COCH3 and CH3COCH3

Which of the following parameter is not involved in calculations based on Born Haber Cycle.

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Ionization enthalpy

Electron gain enthalpy

Electronegativity

Bond dissociation energy

In XeF2 molecules, Xe atom undergoes hybridization

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spd

sp2

sp3

sp3d

The velocity possessed by maximum fraction of molecules at a given temperature is called.

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Average velocity

Root mean aquare velocity

Most probable velocity

None of the above

In the electrolysis of alumina, cryolite is added to.

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Lower the melting point of alumina

Increase the electric la conductivity

Minize anodize affect

Remove impurites from alumina

The phenomenon of x-ray diffraction was studied by

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Huygen

Bragg

Max Planck

None of above

Lithium shows diagonal relationship with

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Beryllium

Sodium

Magnesium

Calcium

Which of the following mixture is used as most popular flame in AAS.

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Acetylene air

Acetylene O2

Hydrogen air

Hydrogen O2

Which of the following is not biological characteristics of water.

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COD

Animals

Plants

Viruses

The change in the concentration of the reactant of product per units time is called.

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Order of the reaction

Melecularity of the reaction

Rate of reaction

None of the above

Which is the correct configuration of Fe3+ (Z= 26)?

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[Ar] 4s² , 3d⁶

[Ar] 4s² , 4d⁵

[Ar] 3d⁵

None of these

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