Question # 1

Acid rain effects

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Human being

Crops

Aquatic life

All above

Which of the following has the maximum ionic character.

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HF

HCl

HI

HBr

Magnesium burns in air to give.

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MgO

MgCO3

Mg3N2

Both A and C

Phosphorus normally exhibit a covalency of.

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+1 and +2

+2 and +3

+3 and +4

+4 and +5

In nature nickel is found in the form of.

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Sulphides

Silicates

Arsenides

All

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

Stable metal ions strictures are.

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Noble gas structure

Is electron group structure

Transition metal in structure

All of the above

The pH of milk is

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6.0

6.5

7.0

7.5

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

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F-

O2-

Na+

Ca2+

Green houses are responsible for keeping our plant warm and sustaining life on the earth.

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CO2 & water vapours

CO2 & CFC

CO2 & H2O

CO2 & CH4

Which of the following is not an alkali metal.

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Potassium

Francium

Sodium

Strontium

The alkali metal with highest melting point is

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K

Na

Li

Ca

Which of the following is strongest reducing agent.

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Be

Mg

Ca

Sr

Relative order of acidity of HF, HCl, HBr, and HI acids is

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HCl > HBr > HI > HF

HF > HCl > HBr > HI

HI > HBr > HCl >HF

HF > HI > HCl > HBr

Hybridization involves.

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Orbitals of same atom with slightly different energies.

Orbitals of different atoms, but with equal energies.

Orbitals of the same atom but with widely different energies.

Orbitals of different atoms with different energies.

Which metal can produce dihydrogen gas by reaction with dil H2SO4

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Ag

Fe

Cu

Pt

The correct order of ionic radii for the following ions is.

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S²- < P^3- < Cl- < K+

Cl- > S2+ > P3- > k+

K+ > Cr > S2+ > P3-

P3+ > S2 > Cl - > K+

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

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Mg

Ca

K

Na

Which of the following halogen exist in solid state.

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F2

I2

Cl2

Br2

Which among the following elements has the highest value of IE.

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Mg

Na

Ca

Sr

Which of the following is an example of super octet molecules.

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C1F3

IF7

PCl5

All the three

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