Question # 1

M shell has sub sheels.

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1s , 2s

1s,2s,3s

2s,2p

3s,3p,3d

In metals, the hold of nucieus over the valence shell elecrons is veak due to.

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Highlectron affinity

Large sized atoms

High ionization energies

All of the above

What will be the relative atomic mass of nitrogen given the abundance of its two isotopes, ¹⁴ N and ¹⁵N are 99.64 and 0.35

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14.0210

14.2100

14.0021

14.1200

-------------acts are reserve energy sources.

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Enzymes

Vitamins

Proteins

Lipids

Which of the following is a heterogeneous mixture

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Concrete mixture

a solution of potassium nitrate in water

a solution of calcium hydroxide in water

Hot chocolate

Whcih acid is present in our stomach.

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Nitirc Acid

Hydrochloric acid

Sulphuric acid

All of the above

Bond formation energy of one O-H bond is............

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488 kJ/mol

484 kJ/mol

486 kJ/mol

489 kJ/mol

What will hapen to the concentrations of the prodcut if a reversible reaction at eqiulibrium is not distrubed.

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They will keepon increasing

They will keep on decreasing

They will remain constant

They willremain constant for some time and then start decreasing

Which element is the most reactive element?

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Florine

Oxygen

Chlorine

Nitrogen

Atoms achieve stability by attainign electonic configuration of.

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Alkali metals

Coinage metals

Inert Gases

Alkaline earth metals

Formula of common salt is

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NaCl

AgCl

LiCl

KCl

--------------- acts a catalyst promoting the breakdown of ozone.

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I2

Br2

Cl2

None

How many elements are present in 7th period.

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2

8

18

23

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