Question # 1

The rusting of iron is catalyzed by which of the following.

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Fe

H+

O2

Zn

The formula of Tetraboric acid is.

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H2BO3

HBO2

H2B4O7

H6B4O9

Which of the following is strongest reducing agent.

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Be

Mg

Ca

Sr

pH of pure water at 25 ^oC. kw = 1 x 10^-4

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0

7

14

None of above

Which of the following ions does not have the electronic configuration same as that of neon.

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F-

O2-

Na+

Ca2+

pKa value of hyponitrous acid is.

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-7.0

8.9

4.1

6.6

Which of the following process is used for the conversion of matte is to nickel.

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Orford process

Mond's process

Electrolytio process

All

The first ionization energy of Mg is lower than

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Na

Ca

Al

Be

When calcium is heated in the flame of a Bunsen burner, the colour imparted to the flame is.

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Golden yellow

Brick red

Crimson red

Grassy green

Which librates H2 with NaOH

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B

AI

Zn

All

Boron does not form B3+ ion because.

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It has small size and high ionization energy

It has high electromagnetically

It has high charge density

None of the above

Considering the elements F, Cl ,O and N, the correct order of their chemical reactivity in terms of oxidizing property is.

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F > Cl > N

F > O > Cl > N

Cl > F > O > N

O > F > N > Cl

Transition elements, in general exhibit the following properties, except one Name that property.

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Variable oxidation state

Natural radioactivity

Tendency to form complexes

Formation of alloys

Pig iron is also called.

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Cast iron

Steel

Wrought iron

Stainless steel

Type of hybrid orbitals used by the chlroine atom in CIO2 is.

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sp2

sp3

sp

None of these

The oxidation state of HCiO4

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+ 7

+ 3

+ 5

+ 1

According to SHAB, Lewis acid are divided into.

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Two classes

Three classes

Four classes

None of above

The ionization potential of K would be numerically equal to.

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Electron affinity of Ar

Electromagnetically of K

Electron affinity of K+

ionization energy of Ca

Is a chain silicate

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Olivine

Tremolite

Beryl

Zeolite

An explosive

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Nitroglycerine

Trinitrotoluene

Fluorine perchlorate

All above

Oxalic acid when heated withe conc. H2SO4 it gives out.

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H2O and CO2

CO and CO2

CO2 and H2S

Oxalic sulphate

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