The maximum number of electrons that can be accommodated in the innermost shell are ____.

Correct! Wrong!

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The innermost shell in an atom is K-shell and it can accommodate a maximum of 2 electrons.

Which of the following metals are poor conductors of heat?

Correct! Wrong!

Lead and mercury are poor conductors of heat.

Which of the following is the best conductor of heat?

Correct! Wrong!

Silver is the best conductor of heat.

In the Cathode ray discharge tube current flows only at ____

Correct! Wrong!

Cathode ray discharge tube current flows only in partially evacuated tubes that is at low pressures.

The atomic number of the atom is equal to the number of ____ present in the nucleus.

Correct! Wrong!

The atomic number of the atom is equal to the number of protons present in the nucleus.

The electronic configuration of an element with atomic number 12 is ____.

Correct! Wrong!

The electronic configuration of an element with atomic number 12 is 2,8,2.

Isotopes are ____.

Correct! Wrong!

Isotopes are atoms of same element having same atomic number but different mass number.

The total number of protons and neutrons is equal to the ____ of an atom.

Correct! Wrong!

The total number of protons and neutrons is equal to the mass number of an atom. Protons and neutrons present in the nucleus are collectively known as nucleons.

Which of the following is a liquid at room temperature?

Correct! Wrong!

Mercury is the only metal that is liquid at room temperature.

Metals react with non-metals to form ionic compounds by ____.

Correct! Wrong!

Metals react with non-metals to form ionic compounds by transfer of electrons.

Which of the following atoms do not have neutrons?

Correct! Wrong!

Hydrogen atom has no neutrons. It has 1 electron and 1 proton.

The electronic configuration of carbon is ____.

Correct! Wrong!

The electronic configuration of carbon is 2,4.

Which gas is liberated when metals react with acids?

Correct! Wrong!

Hydrogen gas is liberated when metals react with acids.

The N-shell can accommodate a maximum of 32 electrons.

Correct! Wrong!

The maximum number of electrons that can be accommodated in the N-shell (fourth shell) are 32.

Which of the following non-metals exist in different states?

Correct! Wrong!

Carbon exists in different forms.

Which of the following are bad conductors of electricity?

Correct! Wrong!

Hg and Pb are bad conductors of electricity since, they offer high resistance to the flow of current.

The number of electrons in the last shell of krypton are ____.

Correct! Wrong!

Krypton has 8 electrons in its last shell.

An isotope of ____ is used in the treatment of cancer.

Correct! Wrong!

The isotope of cobalt (Co-60) is used in the treatment of cancer.

The principle of cathode ray tubes is applied in ____ .

Correct! Wrong!

The principle of cathode ray tubes is applied in television picture tubes. Television pictures are due to fluorescence on the television screen that is coated with certain fluorescent or phosphorescent materials.

Alloy of ____ is used in making aircrafts.

Correct! Wrong!

An alloy of aluminium, duralumin is used in of making aircrafts.

The carbon atom can only form ____ bond.

Correct! Wrong!

The carbon atom always forms covalent bond by sharing of electrons.

Atoms with the same atomic number and different mass number are called ____.

Correct! Wrong!

Atoms with the same atomic number and different mass number are called as isotopes.

Neutrons are produced by bombarding thin sheet of beryllium by fast moving ____ .

Correct! Wrong!

Neutrons are produced by bombarding thin sheet of beryllium by fast moving alpha particles.During this process, electrically neutral particles having mass slightly greater than that of the protons are emitted. These particles are neutrons.

Which one of the following is not a covalent carbon compound?

Correct! Wrong!

Baking soda is not a covalent carbon compound but an ionic compound.

Which is the incomplete shell in Li atom?

Correct! Wrong!

The electronic configuration of Li is 2,1(K,L). Hence, L-shell of lithium atom is incomplete.

The electronic configuration of oxygen atom is ____.

Correct! Wrong!

The atomic number of oxygen is 8. Therefore, the electronic configuration of oxygen atom is 2,6.

The number of valence electrons in neon atom are ____.

Correct! Wrong!

In neon atom there are 8 valence electrons.

The number of protons in an atom X, with atomic number Z and mass number A are ____.

Correct! Wrong!

The numbers of protons in an atom X of atomic number Z is Z, since, the number of protons is equal to the atomic number (Z) of an atom.

Sub-atomic particles electron and neutron were discovered by ____ and ____ respectively.

Correct! Wrong!

Sub-atomic particles of electron and neutron were discovered by J.J.Thomson & Chadwick respectively.Sub-atomic particles are the particles which are present in the atom viz., electrons, neutrons and protons.

The valency of carbon is ____.

Correct! Wrong!

The valency of carbon is 4 as it has 4 valence electrons.

ICSE Class 9th Chemistry - Atomic Structures MCQs
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