Question # 1

The greater stability of bonzyl carbonium ion as compared to t-butyl carbonium ion is due to.

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Inductive effect

Resonance effect

Electrometric effect

All above

The Ostwald process is the main method for the manufacture of nitric Acid in the fist step in this process is.

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Nitrogen and hydrogen react to form NH3

Ammonia is burned in O2 to generate N2 and H2O

Nitrogen and oxygen react to form NO2

Ammonia is burned with O2 to generate NO and H2O

According to Usanovich concept a base is defined as any species.

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Capable of giving up anions

Combining with cations

Neutralizing an acid to give a salt

All of above

Phosphorus is detected by fusing the organic compound with -------followed by extraction with H2O

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HNO3

H2SO4

Sodium per oxide

Ozone

Setting of plaster of Paris volves.

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Oxidation with atmospheric oxygen

Combination with atmosphere CO2

Dehydration

Hydration to yield another hydrate

Formation of nano particles involves process lime

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Foramtion of metal nuclei on different sizes.

Interaction among the formed particles

Both A and B

No interaction among the nano particles synthesized

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

The formula of borax glass is.

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Na2B4O7 10H2O

Na2B4O7 5H2O

Na B4 O7

None of above

The main active contaminants of uranium processing are.

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U - 235

U-238

Pu -234

All above

Which of the following statements about anhydrous aluminium chloride is correct.

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It exist as AlCl3 molecules

It is not easily hydrolysed

It sublimes at 100 ^oC under vacuum

Boron does not form B³⁺ ions

The concept of telluric helisx was developed by

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Lother meyer

A.E. de Chancourtois

New lands

Doberieiner

The blue colour of CuSO4 disappears on adding Zn granules to it . it is because of .

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Oxidation of Cu atom

Oxidation of Zn²⁺

Oxidation Cu²⁺

Oxidation of Zn²⁺

Which process of adsorption of hydrogen on palladium is known as.

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Syneresis

Occlusion

Diffusion

Erosion

Which one of the following statement is incorrect in relation to ionization enthalpy.

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Ionization enthalpy increase for each successive electron

The greatest increase in ionization enthaly is experienced on removal of electron from core noble gas configuration

End of the valence electron is marked by a big jump in ionization enthalpy

Removal of electron from orbitals bearing lower value to easier than from orbital having highest n value.

Greenish yellow gas with pungent irritating odour

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Chlorine

Fluorine

Iodine

Bromine

Homolytic fission of convalent bond results in the formation of.

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Free redicals

Carbocations

Carbonions

Both B and C

The maximum absorption in [Ti(OH)2)6 3+ take place at wavelength of.

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6000 A^o

10000 A^o

4000 A^o

5000 A^o

Which of the following is not a component of hollow cathode lamp.

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Anode

Cathode

Filter gas

Atomic vapour

The units of surface tension in SI system are

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Joule m-1

Newton m-1

Erg cm-1

Dynes cm-2

Keeping in view the periodic law and periodic table, suggest which of the following elements should have maximum electronegative character.

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Oxygen

Nitrogen

Fluorine

Astatine

A theoretical link between quantum mechanics and thermodynamic is.

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Electrochemistry

Kinetic theory of gases

Spectroscopic analysis

Statistical thermodynamics

Which of the following expression is correct.

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C = n/RT

C = RT/n

RT = Cn

Cn = 1/RT

The quantum yield of a Photo chemical reaction in

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Always less than unity

Always equal to unity

Always greater than unity

Can have any value > 0 depending on the reaction

Which of the following play significant role in depletion of ozone layer.

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Oxides of nitrogen

Oxides of carbon

Oxides of sulphur

None of above

Which of the following statement is not correct with respect to hardness of water.

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It is due to soluble salts of Na

it is due to soluble salts of Ca

It is due to soluble salts of Mg

It is due to soluble salts of Fe

What ASTM test for compression is designated for plastics.

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D 638

D 695

D 790

D 732

Glass electrode cannot be used to measure the pH of pure.

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Acetic acid

Ethyl alcohol

Gelatin

All above

When orthoboric acid is heated strongly it gives.

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B2O3

H2B3O7

HBO2

B

Vitamin which contains cobalt is.

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Vitamin B1

Vitamin B2

Vitamin B6

Vitamin B12

In second group of inorganic qualitative analysis, the S^2-ions does not form precipitate with which of the following ions.

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^Hg2+

Cu²⁺

Ai³⁺

Cd³⁺

Xe reacts directly with

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O2

Cl2

F2

Br2

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