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

Correct! Wrong!

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Krypton has 8 electrons in its last shell.

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 of the following is the best conductor of heat?

Correct! Wrong!

Silver is the best conductor of heat.

Which gas is liberated when metals react with acids?

Correct! Wrong!

Hydrogen gas is liberated when metals react with acids.

The carbon atom can only form ____ bond.

Correct! Wrong!

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

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.

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.

Isotopes are ____.

Correct! Wrong!

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

Which of the following is a liquid at room temperature?

Correct! Wrong!

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

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.

Which of the following metals are poor conductors of heat?

Correct! Wrong!

Lead and mercury are poor conductors of heat.

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.

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

Correct! Wrong!

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

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 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.

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 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 atoms do not have neutrons?

Correct! Wrong!

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

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.

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.

The electronic configuration of carbon is ____.

Correct! Wrong!

The electronic configuration of carbon is 2,4.

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 number of valence electrons in neon atom are ____.

Correct! Wrong!

In neon atom there are 8 valence electrons.

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

Correct! Wrong!

Carbon exists in different forms.

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 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.

Alloy of ____ is used in making aircrafts.

Correct! Wrong!

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

The valency of carbon is ____.

Correct! Wrong!

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

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.

ICSE Class 9th Chemistry - Atomic Structures MCQs
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