Question # 1

A salt solution is treated with chloroform drops.Then it is shaken with chlorine water, chloroform layer become violet solution contains.

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NO2 ion

NO3 ion

Br ion

I- ion

The dye which is a constituent of Skiffs reagent used for detection formaldehyde group is.

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Gentain violet

Megneta

Phenolphthalein

Rosolic acid

Ingold's isoprene rule states that in tepenoids isoprene units are joined.

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Head to tail

Head to Head

Tail to Tail

In a random order

Which of the following a -amino acid is not capable of exhibiting optical isomerism.

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Glycine

Leucine

Arginine

Alanine

The smallest cluster of carbon atoms in Bucky balls known till today consists of ___________ carbon atoms.

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75

20

60

15

Hydrogen bond is not electrostatic in nature is stated by

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Electrostatic approach

Valence bond approach

Molecular orbital approach

None of the abvoe

Calcium cyanamide on treatment with steam under pressure gives NH3 and

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Calcium carbonate

Calcium hydroxide

Calcium oxide

Calcium bicarbonate

Which of the following factor is involved in band boarding that occur in column chromatography.

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Number of theoretical plates

Eddy diffusion

In phase mass transfer

All above

Temporary hardness of water is due to.

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Bicarbonates of K

Bicarbonates of Na

Carbonates of Ca

Bicarbonates of Ca

Which of the following radical is not a member of IV group.

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Mg²⁺

Co²⁺

Ni²⁺

Mn²⁺

An equal volume mixture explodes with violence

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H2 & N2O

H2 & NO

H2 & N2O4

H2 & N2O3

Which of the following is not an alkali metal

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Rb

Sb

Cs

Fr

A well packed column may hve

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100 plates /m

1000 plates /m

10 plates /m

10,000 plates/m

The light source in AAS used is

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UV light

Visible light

Radio waved

Hollow cathode lamp

In nature nickel is found in the form of.

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Sulphides

Silicates

Arsenides

All

Which of the following statement is not correct with respect to radioactive pollutnats.

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Carcinoma and breast cancer

Leukemia

Increases biological immune system

Somatic and generic disorder

The law of triads is applicable to

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Lithium, beryllium, boron

Fluorine, chlorine, bromine

Chlorine, bromine, iodine

Sodium, potassium, Rubidium

Which of the following carbides reacts with H2O to form propane.

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Al4C3

CaC2

SiC2

Sic

The pH Value 4.2 is of

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Vinegar

Lemons

Oranges

Tomatoes

Which of the following colligative properties can be used to characterize colloidal particles.

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Lowering in vapour pressure

Elevation in boiling point

Depression in freezing point

Osmotic pressure

Which of the following health effect is caused by lead.

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Cancer

Neurotoxin

Hypertension

Kidney damage

The magnetic quantum number (m) specifies the individual orbital in a Sub shell for a given l, m can be.

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l,l- l........-1

l........2, l -3.......-2l

l-l-2,..........-l

l-2,l-4, ............-4l

Phenol on reaction with ethanoic anhydrides in the presence of sodium ethanoate gives.

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Phenyl benzoate

Ethyl benzoate

Phenyl ethanoate

Phenyl methyl ether

Which of the following techniques is used for the separation of macromolecules polymers.

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Size exclusion chromatogrphy

TLC

GLC

HPLC

Which of the following group reagent is used for III group of basic radical.

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Dilute HCl

H2S + HCl

NH4OH + NH4Cl

NH4OH + H2S

Which of the following substance is released into environment in the nuclear power plants.

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Iodine -131

Argon - 41

Sr-90

Cs- 137

All above

Xenan hexaflouride at 47.7 ^oC is

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Colorless solid

yellow solid

Yellow liquid

Colorless liquid

In which pair of species, the Lewis formulae contain same number of ion pairs and bond pairs but they are not isoelectronic.

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O2, N2

SO2, O3

PCl3 , BF3

SOCl2, COCl3

A general trend in the properties of elements of carbon family shows that with increase in atomic number.

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The tendency towards concatenation increases

The tendency to show +2 oxidation state increase

Metallic character decreases

The tendency to form complexes with convalency higher than four decreases.

Lewis concept explain the formation of

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Ionic bond

Covalent bond

Co-ordinate bond

Chemical bond

Which of the following quantity is correct for micro analysis.

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1 -10 mg or < 50 ml

10-20 mg or > 50 mL

50-100 mg or < 100 mL

None of above

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