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Atomic Structure

Description: Free Online Sample Papers and Notes of Chemistry Covers Chemical Reactions, Metals, Non Metals, Carbon, Carbon and its compound, Organic Chemistry
Number of Questions: 25
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Tags: Atomic Structure Atoms Metals Metals and Non Metals Organic Chemistry Inorganic Chemistry Rates of Reactions Carbon and Its Compound Class XI Chemistry Class XII Chemistry Medical Entrance Medical Entrance Exam Engineering Entrance Charged Particles that Constitute an Atom Atomic Mass and Atomic Number Structure of the Atom
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Mass number of atom is expressed by ___________.

  1. atomic number

  2. no.of electrons + no. of protons

  3. no.of protons + no.of neutrons

  4. none of these


Correct Option: C
Explanation:

mass no. = no.of protons + no.of neutrons

Protons and neutrons are collectively known as ______________.

  1. particles

  2. elementary patricles

  3. nucleus

  4. nucleons


Correct Option: D
Explanation:

Protons and neutrons are collectively known as nucleons.

Positive ion is called _________.

  1. cation

  2. anion

  3. proton

  4. none of these


Correct Option: A
Explanation:

Positive ion is called cation.

Most of the organic compounds form ___________.

  1. ionic bond

  2. covalent bond

  3. double bond

  4. both a and b


Correct Option: B
Explanation:

Most of the organic compounds form covalent bonds.

Ionic bond is formed by ________.

  1. donation of electrons

  2. donation of protons

  3. sharing of outermost electron

  4. sharing of protons


Correct Option: C
Explanation:

Ionic bond is formed by sharing of outermost electron.

Chlorine is a halogen gas which ______________.

  1. has a 3 valence electrons

  2. exists in molecular form

  3. has complete outermost shell

  4. none of these


Correct Option: B
Explanation:

Chlorine exist in molecular form.

Electrons are found in _______.

  1. nucleus

  2. orbitals

  3. both 1 and 2

  4. none of these


Correct Option: B
Explanation:

Electrons are found in orbitals.

Which of the following options is a type of bonding?

  1. Electrovalent

  2. Single

  3. Covalent

  4. Both 1 and 3


Correct Option: D
Explanation:

Types of bonding are electrovalent and covalent.

Oxygen molecule forms ___________.

  1. single bond

  2. two covalent bonds

  3. one covalent bond

  4. all of these


Correct Option: B
Explanation:

Oxygen molecule forms two covalent bonds.

Hydrogen molecule is ____________.

  1. polar

  2. non-polar

  3. positively charged

  4. none of these


Correct Option: B
Explanation:

Hydrogen molecule is non-polar.

Covalent molecules exist as __________.

  1. solids at room temperature

  2. gases at room temperature

  3. both liquids and gases at room temperature

  4. none of these


Correct Option: C
Explanation:

Covalent molecules exist as both liquids and gases at room temperature.

Which particles play the most active role in chemical bonding?

  1. Electrons

  2. Protons

  3. Neutrons

  4. Valence electrons


Correct Option: D
Explanation:

Valence electrons play most active role in chemical bonding.

How many electrons are needed in the outermost energy levels of most atoms for an atom to be chemically stable?

  1. 2

  2. 4

  3. 6

  4. 8


Correct Option: D
Explanation:

8 electrons are needed.

A molecule that has oppositely charged ends is ____________.

  1. covalent

  2. polar

  3. non-polar

  4. ionic


Correct Option: B
Explanation:

Molecule with oppositely charged ends is polar.

Ethylene forms ___________.

  1. single bond

  2. one sigma bond and one pi bond

  3. double bond

  4. both 2 and 3


Correct Option: D
Explanation:

Ethylene form double bond which isĀ one sigma and one pi bond.

An ionic bond is formed when electrons are ____________.

  1. completely destroyed

  2. completely transferred

  3. divided

  4. shared equally


Correct Option: B
Explanation:

Ionic bond is formed when electrons are completely transferred.

Ionic bonds are formed ___________.

  1. between metals and non-metals

  2. between metals only

  3. between non-metals only

  4. none of these


Correct Option: A
Explanation:

Ionic bonds are formed betwen metals and non-metals.

Molecule that does not have oppositively charged ends is called a/an ___________.

  1. ion

  2. non-polar molecule

  3. polar molecule

  4. cation


Correct Option: B
Explanation:

Molecule that doesn't have oppositely charged ends is non-polar molecule.

A group of atoms that acts as one charged atom is known as __________.

  1. polyatomic ion

  2. negative ion

  3. molecule

  4. crystal


Correct Option: A
Explanation:

Group of atom acting as one charged atom is polyatomic ion.

Sodium chloride forms _________.

  1. ionic bond

  2. covalent bond

  3. double bond

  4. both a and b


Correct Option: A
Explanation:

Sodium chloride forms ionic-bond.

What is Gilbert Lewis's theory of chemical bonding?

  1. Atoms bond together to fill their valence shells.

  2. Chemical bond is formed when electrons of an atom interact with each other.

  3. Chemical bond is formed when protons of an atom interact with each other.

  4. None of these


Correct Option: A
Explanation:

According to gilbert lewis theory, atoms bond to fill their valence shells.

In formula of water, 2 attached with hydrogen is ___________.

  1. subscript

  2. superscript

  3. atomic number

  4. none of these


Correct Option: A
Explanation:

subscript

Ionic compounds tend to form ___________.

  1. crystalline solids with high temperatures

  2. amorphous solids

  3. amorphous solids with high temperatures

  4. crystalline solids


Correct Option: A
Explanation:

ionic compounds tend to form crystalline solids with high temperature

If a symbol of element in a chemical formula does not have a subscript after it, one unit of that compound contains____ of that element.

  1. 0 atom

  2. 1 atom

  3. 2 atoms

  4. none of these


Correct Option: B
Explanation:

If a symbol doesn't have subscript, it have 1 atom.

Most of the matter around us is in the form of ___________.

  1. elements

  2. compounds

  3. ions

  4. none of these


Correct Option: B
Explanation:

Most of the matter is in the form of compounds.

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