Question # 1

When we move form left to right in a period, atomic number

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Decreases

Increases

First increases then decreases

None of the above

Chlorine has two isotopes, both of which have

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Same mass Number

Same number of electrons

Same number of neurtons

Different number of protons

Such reaction which continue in both directins are called.

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Dynamic

Irreversible

Reversible

Non- reactive

Which types of attractive forces are presentin ionic compounds.

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Covalent bonds

Electrostatic forces of attraction

Mtallic bonds

Coordinate covalent bonds

The atomic radii of the elemtns in periodic table.

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Increase from left to right in a period

Do not chage from left to right in a period

Increase from top to bottom in a group

Decrease from top to bottom in a group

Nitrogen molecule contains.

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Polar covalent bond

Triple Covalent bond

Double covalent bond

Single covalent bond

Transfer of electron between elements result in.

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Coordinate covalent bonding

Ionic bonding

Metallic bonding

Covallent bonding

Which Isotopes is commonly used to irradiate cancer cells.

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Cobalt -60

Iodine-23

Carbon -14

Iodine-131

The colour of anhydrous copper (II)sulphate solid is

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Pink

Black

White

Blue

Why the gas starts coming out when you open a can of fizzy drink.

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Because gteh solubiliyt of the gas increases

Because the gas is dissolved under pressure hence it comes out when pressur eis decreased

Becaue the gas is insoluble in water

Because the solubility of hte gas decreases at high pressure.

Empirical formula of hydrogen peroxide.

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HO

CO

CHO

CH

Whcih of the following is not true about the formationof Na₂S

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Each sodium atom loses one electron

Sodium forms cation

Each sulphur atom gains one electron

Sulphur form anion

The fore of attraction betwene water molecule is.

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Ionic bonding

Covalent bonding

Hydrgen Bonding

Co ordinate Covalent bonding

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