ICSE Class 9th Chemistry 5 – The periodic table MCQs

Mendeleev’s periodic table is based on atomic ____.

Correct! Wrong!

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Mendeleev's periodic table is based on atomic mass.

There are ____ elements in the third period of the periodic table.

Correct! Wrong!

There are 8 elements in the third period of the periodic table.

The period that contains only gaseous elements is the ____ period.

Correct! Wrong!

The first period contains only hydrogen and helium, which are in a gaseous state.

The first periodic table was given by ____.

Correct! Wrong!

The first periodic table was given by Mendeleev.

Mendeleev's periodic table has ____ periods and ____ groups.

Correct! Wrong!

Mendeleev's periodic table has 12 periods and 8 groups.

Which of the following element was not predicted by Mendeleev?

Correct! Wrong!

Eka-nitrogen was not predicted by Mendeleev. Eka-nitrogen does not exist. Mendeleev was able to predict the properties of unknown elements and left three blanks for those elements. He named them eka-boron, eka-aluminium and eka-silicon.

Which of the following were not included in Mendeleev’s periodic table?

Correct! Wrong!

Isotopes were not included in Mendeleev’s periodic table.

Eka-boron is ____.

Correct! Wrong!

Eka-boron is scandium. Mendeleev named scandium as eka-boron, as it was not discovered at that time.

The ‘Law of triads’ was proposed by ____.

Correct! Wrong!

The ‘Law of triads’ was proposed by Dobereiner.

A triad is a group of ____.

Correct! Wrong!

Triad is a group of three elements. Triads were given by Dobereiner.

____ elements were known when Mendeleev presented the periodic table.

Correct! Wrong!

63 elements were known when Mendeleev presented the periodic table.

In order to fill the periodic table, Newlands placed two elements together in a slot. The two elements were ____.

Correct! Wrong!

In order to fill elements into his table, Newlands put cobalt and nickel together in a slot.

Which of the following is the limitation to Newlands classification?

Correct! Wrong!

Newlands classification of elements was limited only up to calcium. He assumed that only 56 elements existed. He placed iron far from cobalt and nickel.

Atomic numbers were discovered by ____.

Correct! Wrong!

Atomic numbers were discovered by Moseley.

The vertical columns in which elements are arranged in Mendeleev’s table are called ____.

Correct! Wrong!

The vertical columns in which elements are arranged in Mendeleev's table are called groups.

Which of the following set of elements showed reversal of atomic weights in Mendeleev’s periodic table?

Correct! Wrong!

Iodine and tellurium showed reversal of atomic weights in Mendeleev’s periodic table.

____ considered atomic volume for the classification of elements.

Correct! Wrong!

Lother Meyer considered atomic volume for the classification of elements.

Cu, Ag and Au are called coinage metals because they ____.

Correct! Wrong!

Cu, Ag and Au are called coinage metals because they were earlier used in minting coins.

According to modern periodic law, the physical and chemical properties of elements are periodic functions of their _____.

Correct! Wrong!

According to modern periodic law, the physical and chemical properties of elements are periodic functions of their atomic number.

Each period in the periodic table ends with ____.

Correct! Wrong!

In the periodic table, each period starts with an alkali metal and ends with an inert gas element.

Which elements were not given proper place in Mendeleev’s periodic table?

Correct! Wrong!

Lanthanides were not given proper place in Mendeleev’s periodic table.

Which was the first classification of elements?

Correct! Wrong!

Earlier when only very few elements were discovered, they were classified very broadly into metals and non-metals.

Which of the following is a metalloid?

Correct! Wrong!

Si is a metalloid since; it shows the properties of both metals and non-metals.

Chemically inactive elements are placed in the ____ group.

Correct! Wrong!

Chemically inactive elements are placed in the eighth group.

Ca, Sr and Ba are alkali metals.

Correct! Wrong!

Ca, Sr and Ba are alkaline earth metals. Their oxides are alkaline in nature and exist in the earth's crust.

ICSE Class 9th Chemistry 5 - The periodic table MCQs
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