Question # 1

AI is more reactive than Fe but AI is less easily corroded than Fe Because

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It is a noble metal

Oxygen forms a protective reaction easily with water

Iron undergoes reaction easily with water

Fe form mono and divalent ions.

SO₂ and NO₂ pollution by increasing

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Alkalinity

Acidity

Neutrality

Buffer action

In Friedal-Craft's alkylation besides AICI3 the other reactants are

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C6H6 + NH3

C6H6 + CH4

C6H6 + CH3CI

C6H6 + CH3COCI

An exothermic reaction is one in which the reacting substances

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Have more energy than the products

Have less energy than the products

Have the same energy as the products

Are at a higher temperature than the products

Which of the following reagent cannot be used for preparing alkyl chloride from alcohol?

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HCI + anhyd. ZnCI₂

NaCI

PCI₅

SOCI₂

Which of the following has greatest reducing power?

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HI

Hbr

HCI

HI

Heating a micture of sodium benzoate and soda lime gives

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Benzene

Methane

Sodium benzoate

Calcium benzoate

Which one of the following compounds does not exist?

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NCI₅

AsF₅

SbCI₅

PF₅

Which is true for an element R present in group 13 of the periodic table?

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It is a gas at room temperature

It has oxidation state of +4

It forms R₂O₃

It forms RX₂

The number of electrons in the M shell of the element with number 24 is

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24

12

13

8

A clathrate may be defined as a

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Cage compound

Liquid crystal

Mixture

Solid solution

When electrons revolve in stationary orbits,

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There is no change in energy level

They vecome stationary

They are gaining kinetic energy

There is increase in energy

Which of the following imparts violet colouration to non-luiminous flame of Bunsen burner?

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NaCl₂

BaCl₂

CaCl₂

KCl

Which has largest radius?

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CO³⁺

Mn³⁺

Fe³⁺

Cr³⁺

Natural fertilizer provides potassium in the form of K₂O (potash)

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1.5 kg

3 kg

4.5 kg

6.5 kg

The last orbit of argon would have electrons

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8

18

2

6

In which molecule carbon atom is sp²hybridized

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CH₄

C2H₄

C₂H₂

None of the above

Which of the following metal exhibits more than one oxidation?

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Na

Mg

Fe

Al

Saturated solution of NaCl on heating becomes

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Super saturated

Unsaturated

Remains saturated

None

Which for the following has greatest reducing power?

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Hl

HBr

HCl

Hl

Enzymes are

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Proteins

Minerals

Oils

Fatty acids

Which metal is protected by a layer of its own oxide?

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Al

Ag

Au

Fe

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