Question # 1

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

The rays emitted by the cathode in a gas discharge tube under low pressure and high voltage of electricity are called cathode rays. Which of the following properties are not related to cathode rays.

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These travel in a straight lines.

These are deflected by magnetic and electric field.

Minerals Fluoreace with a characteristic color when placed in a beam of cathode rays.

These are dependent of the material used for the electrode.

At constant temperature , the decrease in Halmholts free energy is equal to.

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Decrease in entropy

Increase in entropy

Reversible work done by the system

All types of work done

The boiling point of water is unexpectedly high because.

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H2O molecule in linear

Sp3 hydrogen bonding is involved in the formation of water

There is hydrogen bonding and consequent association of H2O molecules.

Oxygen is the first member of the VI group

Beryllium shows diagonal relationship with.

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Mg

Al

Na

B

Which of the following statement is not related to MOT

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Atomic orbitals lose their identities

MOTgives as idea of denationalization

MOT uses all the orbitals and elections

It treated bond as purely covalent

Alums are generally used

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In Dying and water proofing of fabric

In arrest bleeding

IN water purification

All above

The value of comprehensibility factor (z) = pV/nRTfor an ideal gas is equal to.

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R

1

2

3

Which of the following is not a biodegradable polymer.

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Protein

PVC

Cellulose

Nucleic acid

Electron gas theory is able to explain

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Metallic lusture and optical properties

Malleability and ductility

High electrical and thermal conductivity

All of the above

Which of the following is not a characteristic of phthalocyanine dyes.

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They are metal complex

the are insoluble in water

They have porphin nucleus

They are used in photographic plates

Which of the following technique is based on deposition of the analyte at appropriate electrode by the passage of the electric current.

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Chromatography

Dialysis

Electrodeposition

Solvent extraction

Ionic compounds in general possess both

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High melting point and non -directional bonds

High melting points and low boiling poinits

Directional bonds and low boiling points

High solubility in polar and non -polar bonds.

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 one of the following is not correct.

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Ar is used in electric bulbs

Kr is obtained during radioactive decay

Boiling point of H2 is lowest among all noble gases.

Xe forms Xe OF4

The bond between two identical non metal atoms has a pair of electrons.

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Unequally shared between the two

Transferred fully from one atom to another

With identical spins

Equally shared between them

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

The most convenient and has nearest approach to a universal pH measurement

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pH strips

pH indicator

The emf method

The colorimetric

Among oxides of nitrogen all are gases except.

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N2O5

N2O

NO

N2O3

Which of the following technique is used for separation of volatile components.

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GC

HPLC

FPLC

TLC

Valence bond theory is also called as

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Electron pair theory

Band theory

Electron gas theory

Electron pool theory

The common temperature detecting device in DTA are.

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Thermocouples

Thermopiles

Thermistore

All

H2SO4 is used

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In the preparation of aqua regia

In the purification of gold and silver

In the dental filling

None of above

Which of the following hydroxide is getatinous in nature.

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Fe(OH)3

Al(OH)3

Ca(OH)3

Cr (OH)3

In their ionic compounds halogens exhinit the oxidation states of.

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-1

-2

-3

-4

The atomic number of Potassium is 19 and that of manganese is 25. Although the coloured of MnO4 is dark violet yet the K+ is colourles.. This is due to the fact that

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Mn is a transition element while K+ is not

[MnO4]is negatively charged while K+ has a positive charge

The effective atomicnumebr of Mn is [MnO4] is 26 while for K+ the atomic number is 18

The Mn in a high positive oxidation state allows charge transfer transitions

The addition of As to Ge makes the latter a

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Metallic conductor

Ionic conductor

Intrinaic conductor

Extrinsic semiconductor

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 is the strongest reducing agent.

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HF

HCl

HBr

HI

Four elements A, B,C,D have atomic numbers Z , 1 ,Z, Z +1 and Z +2 Respectively If Z is 9, then bond between which pair of elements will be ionic.

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A and C

D and C

D and B

B and C

The word 'ceramic' meant for.

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Soft material

Hard material

Burnt material

Dry material

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