Question # 1

The hybridization of S in SO2 is.

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sp

sp2

sp3

dsp2

Which of the following method is used for the coventrating of ores.

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Gravity separation

Magnetic concentration

Fourth floatation

Electrostatic concentration

All

Which of the following has the greatest metallic character.

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Na

Mg

Al

Si

Acid rain effects

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Human being

Crops

Aquatic life

All above

Bond angle is minimum in

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H2O

CO2

NH3

CH4

Group IV A consist of elements

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3

4

5

6

Which librates H2 with NaOH

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B

AI

Zn

All

Chromium is found in nature in the the form of.

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Oxides

Silicates

Borates

Sulphides

Of all the noble gaes, easily available gases are

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He & Ar

He & Ne

Ne & Ar

Xe & Kr

To increase the life of filament and to low the heat conductivity a mixture in filled in electric bulb.

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Ar & N2

Ar & Kr

Kr & N2

Xe & N2

Copper is resistant to

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Air

Water

Acid and Alkali

All of the above

Which of the following elements has the highest density.

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Mg

Na

K

Rb

Which pair of species can undergo chemical reaction with each other.

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CO+ NO

LiH and H2O

CO2 and HCl

CaH2 and SI H4

The only oxidation state of alkali metals in their compounds is.

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+1

+2

-1

0

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

The process of extracting a metal in pure form its ores is known as.

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Crushing

Grinding

Dressing

Metallurgy

The carbonate of which of the following will have highest lattice energy.

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Barium

Magnesium

Calcium

Strontium

Electron gas theory fails to explain

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Specific heat of metals

Electrical and thermal conductivity

Paramagnetic behavior of metals

All of the above

The inert gases Ar, Kr and Ke form compounds with water at low temperature and high pressure. These compounds are called.

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Halides

Hydrates

Clathrates

All of above

Which of the following metals is the most abundant in the earth's crust.

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Mg

Ca

K

Na

The fluoride tooth paste contains

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SnF2 and Sn2P2O7

NaF

CaF2

None of these

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