Question # 1

What are the total numbers of periods in the modern periodic table

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3

5

7

8

Which has greater hydration energy.

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Li+

Na+

K+

Mg+2

Which one of the following oxides is amphoteric in nature.

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MgO

Na2O

SO2

ZnO

The concept of atomic number was introduced by

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Alrazi

Mendeleeve

Moseley

Dobereiner

In modern periodic table VI period contains elements

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8

18

10

32

Which one of the following elements has the largest second ionization energy.

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O

Na

F

Ne

Which element when react with chlorine form polymeric halide.

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Na

Be

Ba

P

Elements of Groups IIA are called

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Alkali metals

Alkaline earth metals

Coinage metals

Halogens

Ionic Hydrides react with water to form

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Proton

Hydride ions

Hydroxide ions

Hydronium ions

Who gave the law of Triads in 1829?

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Dobereiner

Mosely

Newland

Mendeleev

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

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

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Argon

Boron

Iodine

Sulphur

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

Variable valency is generally exhibited by

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Transition elements

Alkali metals

s-block elements

Gaseous elements

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

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Carbon

Magnesium

sulphur

Hydrogen

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

Which of the following the highest hydration energy

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Li⁺

Na⁺

K⁺

Mg⁺⁺

Which element has lowest melting point

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Beryllium

Magnesium

Calcium

Barium

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