Question
How is heat change $(\Delta H )$ measured at constant pressure? Explain.
✓
Answer
SELF
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
The pH of milk, black coffee, tomato juice, lemon juice and egg white are 6.8, 5.0, 4.2, 2.2 and 7.8 respectively. Calculate corresponding hydrogen ion concentration in each.
Calculate the mass percent of different elements present in sodium sulphate $\left(\mathrm{Na}_2 \mathrm{SO}_4\right)$.
→Classify the following reactions in one of the reaction type studied in this unit.
i. $\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{Br}+\mathrm{HS}^{-} \rightarrow \mathrm{CH}_3 \mathrm{CH}_2 \mathrm{SH}+\mathrm{Br}^{-}$
ii. $(\mathrm{CH})_2 2 \mathrm{C}=\mathrm{CH} 2+\mathrm{HCl} \rightarrow\left(\mathrm{CH}_3\right)_2 \mathrm{ClC}-\mathrm{CH}_3$
iii. $\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{Br}+\mathrm{HO}^{-} \rightarrow \mathrm{CH}=\mathrm{CH}_2+\mathrm{H}_2 \mathrm{O}+\mathrm{Br}^{-}$
iv. $\left(\mathrm{CH}_3\right)_3 \mathrm{C}-\mathrm{CH}_3 \mathrm{OH}+\mathrm{HBr} \rightarrow\left(\mathrm{CH}_3\right)_2 \mathrm{CBrCH}_2 \mathrm{CH}_2 \mathrm{CH}+\mathrm{H}_2 \mathrm{O}$
→i. $\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{Br}+\mathrm{HS}^{-} \rightarrow \mathrm{CH}_3 \mathrm{CH}_2 \mathrm{SH}+\mathrm{Br}^{-}$
ii. $(\mathrm{CH})_2 2 \mathrm{C}=\mathrm{CH} 2+\mathrm{HCl} \rightarrow\left(\mathrm{CH}_3\right)_2 \mathrm{ClC}-\mathrm{CH}_3$
iii. $\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{Br}+\mathrm{HO}^{-} \rightarrow \mathrm{CH}=\mathrm{CH}_2+\mathrm{H}_2 \mathrm{O}+\mathrm{Br}^{-}$
iv. $\left(\mathrm{CH}_3\right)_3 \mathrm{C}-\mathrm{CH}_3 \mathrm{OH}+\mathrm{HBr} \rightarrow\left(\mathrm{CH}_3\right)_2 \mathrm{CBrCH}_2 \mathrm{CH}_2 \mathrm{CH}+\mathrm{H}_2 \mathrm{O}$
Do you observe any soil pollution in your neighbourhood? What efforts will you make for controlling the soil pollution?
Use the molecular orbital energy level diagram to show that $N_2$ would be expected to have a triple bond, $F_2$ a single bond and $Ne_2$ no bond.
→Attempt any five of the following:
(a) What happens when benzene is treated with acetyl chloride in presence of $AlCl _3$ ?
(c) Classify the hydrocarbons according to the carbon-carbon bond.
(d) Arrange the following: $HCl , HBr , Hl , HF$ in order of decreasing reactivity towards alkenes.
(e) Why is $CH _2= CH - CH _2- Cl$ more easily hydrolysed than $CH _3- CH _2- CH _2- Cl$ ?
(f) Which of the two trans-but-2-ene or trans-pent-2-ene is non-polar?
(g) What are benzenoids?
→(a) What happens when benzene is treated with acetyl chloride in presence of $AlCl _3$ ?
(c) Classify the hydrocarbons according to the carbon-carbon bond.
(d) Arrange the following: $HCl , HBr , Hl , HF$ in order of decreasing reactivity towards alkenes.
(e) Why is $CH _2= CH - CH _2- Cl$ more easily hydrolysed than $CH _3- CH _2- CH _2- Cl$ ?
(f) Which of the two trans-but-2-ene or trans-pent-2-ene is non-polar?
(g) What are benzenoids?
Discuss the trend of the following:
Thermal stability of carbonates of Group 2 elements.
Thermal stability of carbonates of Group 2 elements.
The lattice enthalpy of an ionic compound is the enthalpy when one mole of an ionic compound present in its gaseous state, dissociates into its ions. It is impossible to determine it directly by experiment. Suggest and explain an indirect method to measure lattice enthalpy of NaCl(s).
- Define electron gain enthalpy.
- Give the resonance structure of $O_3$.
- Give reason:
- $He_2$ molecule is not formed.
- Ethyl alcohol dissolves in $H_2O$
- HF is polar though it possesses covalent bond.
Write the structure of important functional group and make a table of their prefixes and suffixes according to IUPAC.