Question # 1

What criteria did Mendeleev use in arranging his periodic table.

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Atomic mass

Atomic number

Mass number

Density

Which one of the following is a metalloid.

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sulphur

Antimony

Mercury

Zinc

Number of elements in the first period of the periodic table is

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2

8

14

18

Which element has lowest melting point

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Beryllium

Magnesium

Calcium

Barium

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

Which one of the following oxides is amphoteric in nature.

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MgO

Na2O

SO2

ZnO

As you proceed across a period in the periodic table the first ionization energy

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Decrease

Increase

Remains constant

First increase up the middle of period and then decreases

Which one is an incomplete period

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4th

5th

6th

7th

Which of the following are alkaline earth metals?

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Be, Mg, Ca

Li, Na, K

Fe, CO, Ni

B, Al, Ga

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

Majority of the elements of the periodic table are.

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Semi metals

Non metals

Metals

Noble metals

In which one of the following sets do all three particles have same number of total electrone

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F- ,Cl-,Br-

Li+ , Na+ , K+

N^--3, O-2, F-,

Na+, Mg+2, K+

Mark the incorrect statement

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Metallic character increase down the group

Metallic character increase from left to right along a period

Metallic character decrease from left to right along a period

Metallic character remains the same down the group

Which of the following has highest M.P

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Aluminium

Silicon

Phosphorus

Sulphur

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

Who gave the law of Triads in 1829?

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Dobereiner

Mosely

Newland

Mendeleev

Electron affinity is measure of energy

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Required to remover the electron

Released by adding an electron

Required to excite an electron

Released by removing an electron

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

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II

IV

III

VI

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