Chemical Bonding And Reactions — Part 1 MCQs with Explanations

The correct answer is Option A: 3π and 12σ Here's why: Benzene's Structure: Benzene (C 6 H 6 ) is a ring-shaped molecule with alternating single and double bonds between the carbon atoms. Understanding σ bonds: A sigma (σ) bond is a single bond. It's formed by the direct overlap of atomic orbitals. In Benzene, each carbon atom is bonded to one hydrogen atom and two other carbon atoms with sigma bonds. Thus there are 6 C-H sigma bonds and 6 C-C sigma bonds. So in total sigma bonds are 6+6=12. Understanding π bonds: A pi (π) bond is part of a double or triple bond. It's formed by the sideways overlap of p orbitals. The double bonds in benzene are made of one sigma (σ) bond and one pi (π) bond. Benzene has three double bonds, therefore it has three π bonds. Therefore: Benzene has 3 π bonds and 12 σ bonds .

Cations is the correct answer to “What is positively charged ion called”. This question is standard in competitive examination syllabi for Chemical Bonding And Reactions.

Energy is always released is the correct answer to “What happens when a chemical bond is formed”. This question is standard in competitive examination syllabi for Chemical Bonding And Reactions.

potential energy is the correct answer to “When a chemical bond is formed, there is decrease in”. This question is standard in competitive examination syllabi for Chemical Bonding And Reactions.

Electronic theory of chemical bonding is the correct answer to “Which of the following theory said that bond is formed between two atoms either by sharing or transfer of valence electrons”. This question is standard in competitive examination syllabi for Chemical Bonding And Reactions.

molecular weight is the correct answer to “The product of equivalent weight and valency of an element is equal to”. This question is standard in competitive examination syllabi for Chemical Bonding And Reactions.

outermost shell of an atom is the correct answer to “Valence electrons are present in the:”. This question is standard in competitive examination syllabi for Chemical Bonding And Reactions.

Two is the correct answer to “The atomic number of an element is 8. How many electrons will it gain to form a compound with sodium”. This question is standard in competitive examination syllabi for Chemical Bonding And Reactions.

conduct current in fused state is the correct answer to “Electrovalent compound's”. This question is standard in competitive examination syllabi for Chemical Bonding And Reactions.

Aluminium is the correct answer to “An example of an element whose molecules have three valence electrons”. This question is standard in competitive examination syllabi for Chemical Bonding And Reactions.

electrically charged atoms or groups of atoms is the correct answer to “The electrovalent compounds is made up of”. This question is standard in competitive examination syllabi for Chemical Bonding And Reactions.

They have high melting point and boiling point is the correct answer to “Which of the following is the property of ionic compounds”. This question is standard in competitive examination syllabi for Chemical Bonding And Reactions.

3 is the correct answer to “In Ammonia the valency of nitrogen is-”. This question is standard in competitive examination syllabi for Chemical Bonding And Reactions.

7 is the correct answer to “The Valence of chlorine relative to oxygen is . . . . . . . .”. This question is standard in competitive examination syllabi for Chemical Bonding And Reactions.

4 is the correct answer to “A semiconductor has generally . . . . . . . . valence electrons.”. This question is standard in competitive examination syllabi for Chemical Bonding And Reactions.

Sharing of electrons is the correct answer to “Covalent bonds are formed by bonding between two atoms”. This question is standard in competitive examination syllabi for Chemical Bonding And Reactions.

4 is the correct answer to “What is the valency of carbon in carbon dioxide”. This question is standard in competitive examination syllabi for Chemical Bonding And Reactions.

a high melting point and boiling point is the correct answer to “Which of the following is not a property of covalent compound”. This question is standard in competitive examination syllabi for Chemical Bonding And Reactions.

all of the above is the correct answer to “Ionic solids”. This question is standard in competitive examination syllabi for Chemical Bonding And Reactions.

All of these is the correct answer to “Covalent Compounds . . . . . . . .”. This question is standard in competitive examination syllabi for Chemical Bonding And Reactions.

electrostatic in nature is the correct answer to “A metallic bond is”. This question is standard in competitive examination syllabi for Chemical Bonding And Reactions.

Only 1 is the correct answer to “With reference to ionic compounds, consider the following statements. 1. Ionic compounds are insoluble in alcohol. 2. Ionic compounds in the solid state are good conductor of electricity. Which of the statement given above is/are correct”. This question is standard in competitive examination syllabi for Chemical Bonding And Reactions.

Carbon tetrachloride is the correct answer to “Which one among the following is a covalent compound”. This question is standard in competitive examination syllabi for Chemical Bonding And Reactions.

NaCl, KCl, MgF2, CaCl2 is the correct answer to “Examples of ionic bond are”. This question is standard in competitive examination syllabi for Chemical Bonding And Reactions.

Al is the correct answer to “Which of the following elements has three valence electrons”. This question is standard in competitive examination syllabi for Chemical Bonding And Reactions.

transition elements is the correct answer to “The variable valency indicates . . . . . . . .”. This question is standard in competitive examination syllabi for Chemical Bonding And Reactions.

Both A and R are true, but R is not the correct explanation of A is the correct answer to “Assertion (A) Double bond cause more repulsion than single bonds. Reason (R) Triple bonds cause more repulsion than a double bond.”. This question is standard in competitive examination syllabi for Chemical Bonding And Reactions.

6 is the correct answer to “Number of electrons participate in bonding in N 2 .”. This question is standard in competitive examination syllabi for Chemical Bonding And Reactions.

All of the above is the correct answer to “Electrovalent bond formation depends on”. This question is standard in competitive examination syllabi for Chemical Bonding And Reactions.

3 is the correct answer to “What is the valency of aluminium in Al 2 O 3”. This question is standard in competitive examination syllabi for Chemical Bonding And Reactions.

3 is the correct answer to “An element 'A' forms oxides with the formula Al 2 O 3 . What is the valency of element A”. This question is standard in competitive examination syllabi for Chemical Bonding And Reactions.

1 is the correct answer to “What is the valency of copper in cuprous oxide”. This question is standard in competitive examination syllabi for Chemical Bonding And Reactions.

1, 2, 3 is the correct answer to “Often the positive elements have valency.-”. This question is standard in competitive examination syllabi for Chemical Bonding And Reactions.

+2 is the correct answer to “The atomic number of magnesium is 12. What will be its valency”. This question is standard in competitive examination syllabi for Chemical Bonding And Reactions.

It has a high melting point and boiling point is the correct answer to “Which of the following is a property of an ionic compound”. This question is standard in competitive examination syllabi for Chemical Bonding And Reactions.

hydrogen bonding is the correct answer to “Liquid water is denser than ice due to”. This question is standard in competitive examination syllabi for Chemical Bonding And Reactions.

free ions is the correct answer to “Molten NaCl is a good conductor of electricity is due to”. This question is standard in competitive examination syllabi for Chemical Bonding And Reactions.

Al2X3 is the correct answer to “If formula of sodium salt of an anion X is Na 2 X, then the formula of its aluminium salt would be”. This question is standard in competitive examination syllabi for Chemical Bonding And Reactions.

outermost is the correct answer to “Covalent bonds are formed by the sharing of electrons between two atoms so that both can achieve a completely filled . . . . . . . . shell.”. This question is standard in competitive examination syllabi for Chemical Bonding And Reactions.

XY2 is the correct answer to “The element X is a tetravalant and the element Y is a bivalent . The compound formed by these two elements will be . . . . . . . .”. This question is standard in competitive examination syllabi for Chemical Bonding And Reactions.