Question
What is Bond Enthalpy? Discuss in detail.
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Answer
SELF
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Draw the structure of $B_2H_6$.
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aluminium is treated with dilute NaOH?
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Give suitable reason for the following:
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$[\text{SiF}_6]^{2-}$ is known whereas $[\text{SiCl}_6]^{2-}$ not.
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In group $14$, the tendency for catenation decreases with increasing atomic number.
$K_p = 0.04$ atm at 899 K for the equilibrium shown below. What is the equilibrium concentration of $C_2H_6$ when it is placed in a flask at 4.0 atm pressure and allowed to come to equilibrium?
$\text{C}_2\text{H}_6\text{ (g)}\rightleftharpoons\text{C}_2\text{H}_4\text{ (g) + H}_2\text{ (g)}$
→$\text{C}_2\text{H}_6\text{ (g)}\rightleftharpoons\text{C}_2\text{H}_4\text{ (g) + H}_2\text{ (g)}$
What do you understand by the term ‘auto-protolysis of water? What is its significance?
Match the ions given in Column I with their nature given in Column II.
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Column I
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Column II
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(i)
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 |
(a)
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Stable due to resonance.
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(ii)
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$\text{F}_3-\text{C}^\oplus$
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(b)
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Destabilised due to inductive effect.
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(iii)
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$\ \ \ \ \ \ \ \ \ \ \ \ \text{CH}_3\\\ \ \ \ \ \ \ \ \ \ \ \ \ |\\\text{CH}_3-\text{C}^\ominus\\\ \ \ \ \ \ \ \ \ \ \ \ \ \ |\\\ \ \ \ \ \ \ \ \ \ \ \ \ \text{CH}_3$
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(c)
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Stabilised by hyperconjugation.
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(iv)
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$\ \ \ \ \ \ \ \ \ \ \ \ \ _\oplus\\\text{CH}_3-\text{CH}-\text{CH}_3$
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(d)
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A secondary carbocation.
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Explain in brief aromaticity.
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a. 0.01 M
b. $0.1 M HCl ?$
→a. 0.01 M
b. $0.1 M HCl ?$
The ionization constant of dimethylamine is $5.4 \times 10^{–4}$. Calculate its degree of ionization in its $0.02M$ solution. What percentage of dimethylamine is ionized if the solution is also $0.1M$ in NaOH?
→Arrange in properties:
→- $HF, HCI, HBr, HI$ [Thermal stability]
- $LiF, LiCI, LiBr, Lil$ [Ionic character]
- $PH_3, PCI_3, PF_3,$ [Covalent character]
- $H_2O, NH_3, H_2S, HF$ [Polarity]
- $BeCl_2, BCI_3, CCI_4, PCI_3,$ [Bond angle]