Question # 1

In which compound, oxidation state of sulphur is +6

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H2S

H2SO4

H2SO3

SO3

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

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+

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

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2

8

14

18

Which oxide is more basic in nature.

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Beo

MgO

CaO

BaO

Ionization energy of calcium is.

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Lower than that of barium

Lower than that of magnesium

Higher than that of beryllium

Lower than that of strontium

Which element has lowest melting point

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Beryllium

Magnesium

Calcium

Barium

In which block of periodic table non metals are present.

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s

p

d

f

Which element when react with chlorine form polymeric halide.

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Na

Be

Ba

P

Which of the following element has lowest ionization energy

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Beryllium

Boron

Carbon

Oxygen

Which one of the following is a metalloid.

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sulphur

Antimony

Mercury

Zinc

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 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

Variable valency is generally exhibited by

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Transition elements

Alkali metals

s-block elements

Gaseous elements

The oxides of metal sare generally

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Acidic

Basic

Neutral

Amphoteric

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 the correct statement

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Cl^-is smaller than Cl atom

Cl^-(Ion) and Cl (atom) are equal in size

Na⁺is smaller than Na atom

Na⁺is larger than Na atom

Ionic Hydrides react with water to form

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Proton

Hydride ions

Hydroxide ions

Hydronium ions

Which has greater hydration energy.

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Li+

Na+

K+

Mg+2

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

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

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3

5

7

8

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

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3

5

7

8

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

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