Question # 1

Which of the following information is correct about a typical packed column in GC.

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10-100 m long and 2 to 6 cm to diameter

1-10 m long and 0.2 to 0.6 cm in diameter

0.1-1 m long and 0.02 to 0.00 cm in diameter

None of the above

The special chrome steels of the stainless variety contain how many percent of chromium.

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4 to 8

11 to 17

9 tp 10

12 to 15

The unit cell having dimensions, a = b=c, alpha = beta= gama not equal 90 ^o is known.

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Cubic

Trigonal

Tetragonal

Monoclinic

Which of the following is not a physical test.

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Colour test

Flame test

Beed test

Wet test

Group IV A consist of elements

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3

4

5

6

Bromine is used as

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Fungicides

Herbicides

Germicides

Insecticides

Which statement is false.

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If a reaction is thermodynamically spontaneous it may occur rapidly

If a reaction is thermodynamically spontaneous it may occur slowly.

Activation energy is a kinetic quantity rather than a thermodynamic quantity.

If a reaction is thermodynamics spontaneous, it must have a low activation energy.

Washing soap can be prepared by saponification with alkali of _____ of the following oil.

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Rose oil

Paraffin oil

Groundnut oil

Coconut oil

Which of the following analytical techniques can be used to extract metal ion chelates.

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Solvent extractions

Evaporation

GC

Distillation

Which of the following statement is not correct regarding galvanic cells.

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Oxidation occurs at the anode

Ions carry current inside the cell

Electrons flow around the external circuit. form cathode to anode

When the e.m.f. of the cell is positive cell reactionis spontaneous

Which of the halogens has lowest bond energy.

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Cl2

Br2

F2

I2

Yellow green flame is observed with

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Calcium salt

Barium salt

Strontium salt

Sodium salt

Fluorine form Fluorides reacting with

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Metals

Non metals

Metalloide

Any of above

The phenomenon of x-ray diffraction was studied by

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Huygen

Bragg

Max Planck

None of above

The common oxidation state of lanthanides is.

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+3

+2

+1

+4

The rate at which a substance reacts depends on its.

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Molecular mass

Active mass

Equivalent mass

Molar mass

Soap and detergent remove the direct form clothes due to.

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Osmosis

Gravity

Lowering of interfacial tension

Diffusion

What is the raw material of sugar industry.

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Sugar cane

Potato

Carrot

Sugar heat

Both A and C

Phosphorus has the oxidation state of +3 in

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Orthophosphoric acid

Hypophosphoric acid

Metaphosphoric acid

Orthophosphorus acid

Which element among the following cannot exhibit variable electronvalency

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₂₉Cu

₅₀Sn

₂₅ Mn

₃₈ Sr

The energy gap between tag and eg sets in denoted by

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A-

10 Dq

Both A and B

None of above

Which of the following groups exert -1 effect.

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- NO2

- CN

-COOH

<C = 0

Which of the following is the strongest oxidant.

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F2

Cl2

br2

I2

Which of the following is a planar molecule.

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Acetone

Formic acid

Acetic acid

All above

The most reactive alkali metal among the following is

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Li

Na

Cs

Rb

The term 'brass' is very commonly used to designate any alloy primarily of.

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Copper and zinc

Aluminum and iron

Copper and aluminum

Zinc and nickel

The light source in AAS used is

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UV light

Visible light

Radio waved

Hollow cathode lamp

An stereospecific enzyme in one which catalyses

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Formation of one stercolsomer

Reaction of one stereoisomer only

Both of these

None of these

Cement is a mixture of

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Clay and clinker

Clay limestone and gypsum

Limestone and gypsum

Binder

Bond angle is minimum in

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H2O

CO2

NH3

CH4

Which of the following is not an ore of iron.

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Haematite

Magnetite

Siderite

Monazite

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