Question # 1

In which group of periodic table is the element which has atomic number 14.

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II

IV

III

VI

Keeping in view size of atoms ,which order is the correct one.

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Mg > Sr

Ba > Mg

Lu > Ce

Cl > I

In which group, melting point and boiling point increase downward in a group

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IA

II A

VII A

Both a and b

Which of the following has highest M.P

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Aluminium

Silicon

Phosphorus

Sulphur

Which one of the following elements burns in air to form an oxide which, when shaken with water, give a solution with a pH greater than 7.

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Carbon

Magnesium

sulphur

Hydrogen

Correct order according to atomic size in the following is

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Na > K

Be > Mg

O > N

Cl > F

Fluorine is in group VIIA of periodic table. Its chemistry will most closely resembles that of.

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Argon

Boron

Iodine

Sulphur

Which one of the following is a metalloid.

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sulphur

Antimony

Mercury

Zinc

Variable valency is generally exhibited by

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Transition elements

Alkali metals

s-block elements

Gaseous elements

Who gave the law of Triads in 1829?

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Dobereiner

Mosely

Newland

Mendeleev

In a period, from left to right in the periodic table, the size of atom generally.

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Increases

decreases

Remains constant

First increase upto the middle of period and then decreases

Across a period from left to right in the periodic table, the melting and boiling point.

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Decrease

Increase

Remain constant

First increase upto the middle of period and then decrease

What criteria did Mendeleev use in arranging his periodic table.

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Atomic mass

Atomic number

Mass number

Density

Fluorine is in group VII A of periodic table. Its chemistry will most closely resembles that of.

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Argon

Boron

Iodine

Sulphur

The basis of modern periodic table is

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Electron affinity

Atomic mass

Ionization Potential

Atomic number

Hydrogen resembles in properties with

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IA, IV A and VII A elements

III A, IV A and V A elements

II A, IV A and VI A elements

II A, III A and VII A elements

The concept of atomic number was introduced by

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Alrazi

Mendeleeve

Moseley

Dobereiner

Which is the longest periodic table

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4

5

6

7

The element of 2nd period, which has highest ionization energy from the following is

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Be

C

N

O

Which statement is incorrect.

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All the metals are good conductors of electricity

All the metals are good conductor of heat

All the metal form positive ions

All the metal form acidic oxides

Which of the following element has lowest ionization energy

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Beryllium

Boron

Carbon

Oxygen

Which element when react with chlorine form polymeric halide.

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Na

Be

Ba

P

Which element has lowest melting point

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Beryllium

Magnesium

Calcium

Barium

Which hydride is intermediate in nature.

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NaH

BeH2

NH3

HCl

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