Question # 1

In graph of atomic volume versus atomic weight the elements corresponding to peaks in the curve belong to.

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Group 1

Group 18

Group 4

Group 14

The concentration required to give a signal equal to three times the standard deviation of the baseline is called.

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Sensitivity

Detection limit

Signal to noise ratio

None of the above

The increasing order of energies of various sub shells is

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1s < 2s<3s<2p<3p<4s<3d

1s <2s<2p<3s<3p<4s<3d

1s>2s>2p>3s>3p>4s>3d

1s>2s>2p>3p>3d>4s

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

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Solvent extractions

Evaporation

GC

Distillation

The nature of bonds in compounds of carbon and silicon is mostly

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Covalent

Electrovalent

Metallic

Both A and B

The percentage of nitrogen in urea is.

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36%

46%

55%

65%

Two solids A and B have appreciable different solubility in water but their m.p. are very close. The mixture A and B can be separated by.

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Sublimation

Distillation

Fractional crystallization

Specific rotation

Disease caused by eating fish found in water contaminated with industrial waste having mercury is.

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Minamata disease

Bright's disease

Hashimoto's disease

Osteoaclerosis

In the metallurgy of iron, when limestone is added to the blast furnace, the calcium ion ends up in.

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Slag

Gangue

Metallic calcium

Calcium carbonate

A colloidal system in which both the dispersion phase and dispersed phase are liquid is.

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Smoke

Emulsion

Whipped cream

Mist

Which of the following have identical bond order.

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CN- and O2-

CN - and NO+

O2- and CN+

NO+ and CN+

Which of the following contains both covalent and ionic bond.

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CCl4

NH4Cl

CaCl2

H2O

Which of the following will be most effective int he coagulntion of

Fe (OH)3 sol.

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NaCl

MgSO4

AlCl3

Mg3 (PO4)2

The most important problem regarding nano chemistry

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Elucidation of relationship between also and chemical reactivity of particle

Determination of size of particle

Determination of reactivity of particle

Determination of physical properties of nano particles.

Pick out the incorrect statement about K2Cr2O7

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It is thermally stable

It dissolves in alkali to form chromate

It oxidizes acidified FeSO4 solution to Fe2(SO4)3

It is used as cleansing agent for glassware, etc. when mixed wiht cold conc. H2SO4

Peeling of ozone umbrella is due to.

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CFCa

PAN

CO2

Coal burning

The pKa of an acid having ionization constant 1 x 10^-5 is

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-5

5

9

-9

Different arrangement of groups in space which can be converted into one another by rotation around a single bond are caled.

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Conformations

Metameres

Enatiomers

All of the above

O2 molecule is.

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Fermagnetic

Forromagnetic

Paramagnetic

Diamagnetic

Which of the following source is commonly used as excitation source in fluorimeter.

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Tungsten lamp

Mercury vapour lamp

Nernst vapur lamp

Radio souse

Solid phase micro extraction is a solvent less extraction technique This technique is used for preparation of samples for analysis by which of the following technique.

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HPLC

GC

TLC

Electrophoreals

In the fourth flotation process for the purification of ores, the ore particles floats because.

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They are light

Their surface is not easily wetted by water

They bear electrostatic charge

They are insoluble

A trace constituent is one whose amount in the sample is.

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< 10%

< 010%

< 1.0%

< 0.01 %

Which of the following elements does not impart any characteristic colour to the flame.

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Ca

Mg

Ba

Sr

Primary structure of protein refers to

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Amino acid sequence

Arrangement of peptide chains

Orientation of amino acids

Whether is has a or b helix in space structure.

Which of the following statements in not correct with respect to the important characteristics of aromatic compounds.

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They are usually cyclic compounds

They are resistant to usual addition reactions

They usually undergo substitution reactions

They are less stable

Bromine number is measure of.

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Paraffins

Unsaturates

Saturates

None of these

Which of the following is not an acid radical

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Cl-

Br-

K+

I-

An example of acyclic polytropenoid is

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Myrcone

Buna -S

Synthetic rubber

Natural rubber

The high oxidizing power of halogens is favored by.

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Low heat od dissociation of X2

A high electron affinity of the atom

A higher hydration energy of the ion

All of above

In the Lewis formula of which of the following species, the number of single double and dative bonds are equal.

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N2O3

HNO3

SO2

SOCl2

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