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31
What is the number of π and σ bonds in benzene?
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Answer & Solution
Answer: Option A
Solution:
The correct answer is Option A: 3π and 12σ
Here's why:
Benzene's Structure: Benzene (C6H6) 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.
32
What is the valency of copper in cuprous oxide?
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Answer: Option A
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33
Often the positive elements have valency.-
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Answer: Option D
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34
The atomic number of magnesium is 12. What will be its valency?
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Answer: Option A
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35
Which of the following is a property of an ionic compound?
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Answer: Option A
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36
Liquid water is denser than ice due to
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Answer: Option B
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37
Molten NaCl is a good conductor of electricity is due to
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Answer: Option B
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38
If formula of sodium salt of an anion X is Na2X, then the formula of its aluminium salt would be
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Answer: Option C
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39
Covalent bonds are formed by the sharing of electrons between two atoms so that both can achieve a completely filled . . . . . . . . shell.
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Answer: Option A
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40
The element X is a tetravalant and the element Y is a bivalent . The compound formed by these two elements will be . . . . . . . .
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Answer: Option C
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