Question # 1

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

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 of the following has highest M.P

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Aluminium

Silicon

Phosphorus

Sulphur

In modern periodic table VI period contains elements

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8

18

10

32

The first ionization energy of Na, Mg, Al and Si are in theorder of.

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Na < Mg < Al < Si

Na > Mg> Al> Si

Na > Mg< Al< Si

Na< Mg> Al< Si

Which one is an incomplete period

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4th

5th

6th

7th

Who gave the law of Triads in 1829?

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Dobereiner

Mosely

Newland

Mendeleev

Element of which group reacts with hydrogen and form ionic hydrides.

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II A

IV A

V A

VI A

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

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O

Na

F

Ne

Which hydride is intermediate in nature.

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NaH

BeH2

NH3

HCl

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

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

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II

IV

III

VI

Which of the following statement is correct

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Na atom is smaller than Na⁺

Na atom is larger than K atom

F atom is smaller than F^-

F atom is larger than F^-

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

Ionic Hydrides react with water to form

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Proton

Hydride ions

Hydroxide ions

Hydronium ions

What criteria did Mendeleev use in arranging his periodic table.

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Atomic mass

Atomic number

Mass number

Density

Which class of elements shows law value of first ionization potential.

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Alkali metals

Alkaline earth metals

Halogens

Noble gases

Which one of the following oxides is amphoteric in nature.

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MgO

Na2O

SO2

ZnO

Which element when react with chlorine form polymeric halide.

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Na

Be

Ba

P

Which property of hydrogen not resemble to alkali metals.

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Electronic configuration

Oxidation state

Reaction with halogen

Metallic nature

Which of the following element has lowest ionization energy

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Beryllium

Boron

Carbon

Oxygen

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 element has lowest melting point

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Beryllium

Magnesium

Calcium

Barium

The concept of atomic number was introduced by

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Alrazi

Mendeleeve

Moseley

Dobereiner

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