Question
What will be the work done on an ideal gas enclosed in a cylinder, when it is compressed by a constant external pressure, pext in a single step as shown in Fig. Explain graphically.
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Explain various addition reactions of alkynes.
(i) Calculate the total number of electrons present in one mole of methane.
(ii) Find (a) the total number and (b) the total mass of neutrons in 7 mg of 14C. (Assume that mass of a neutron $=1.675 \times 10^{-27} kg$ )
(iii) Find (a) the total number and (b) the total mass of protons in 34 mg of $NH _3$ at STP.
Will the answer change if the temperature and pressure are changed?
→(ii) Find (a) the total number and (b) the total mass of neutrons in 7 mg of 14C. (Assume that mass of a neutron $=1.675 \times 10^{-27} kg$ )
(iii) Find (a) the total number and (b) the total mass of protons in 34 mg of $NH _3$ at STP.
Will the answer change if the temperature and pressure are changed?
Calculate the oxidation number of sulphur, chromium and nitrogen in H2SO5, $\text{Cr}_2\text{O}^{2-}_7$ and $\text{NO}^{-}_3.$ Suggest structure of these compounds. Count for the fallacy.
→Out of benzene, m-dinitrobenzene and toluene which will undergo nitration most easily and why?
Consider the following species:
N3–, O2–, F–, Na+, Mg2+ and Al3+
N3–, O2–, F–, Na+, Mg2+ and Al3+
- What is common in them?
- Arrange them in the order of increasing ionic radii.
Calculate the enthalpy change for the process
→$\text{CCI}_4(\text{g})\xrightarrow{ \ \ \ \ \ }\text{C}(\text{g})+4\text{CI}(\text{g})$
and calculate bond enthalpy of C – Cl in CCl4(g).$\Delta_\text{vap}\text{H}^\ominus(\text{CCI}_4)=30.5\text{kJ} \ \text{mol}^{-1}.$
$\Delta_\text{f}\text{H}^\ominus(\text{CCI}_4)=-135.5\text{kJ} \ \text{mol}^{-1}.$
$\Delta_\text{a}\text{H}^\ominus(\text{C})=-715.0\text{kJ} \ \text{mol}^{-1},$ where $\Delta_\text{a}\text{H}^\ominus$ is enthalpy of atomisation
$\Delta_\text{a}\text{H}^\ominus(\text{CI}_2)=242\text{kJ} \ \text{mol}^{-1}$
Explain the non linear shape of H2S and non planar shape of PCl3 using valence shell electron pair repulsion theory.
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→"For classification of elements atomic number is more appropriate in comparison to atomic mass." Comment.
1. During estimation of nitrogen present in an organic compound by Kjeldahl's method, the ammonia evolved from 0.5 g of the compound in Kjeldahl's estimation of nitrogen, neutralized 10 mL of $1 M H _2 SO _4$. Find out the percentage of nitrogen in the compound.
2. Explain why $\left( CH _3\right)_3 \stackrel{+}{ C }$ is more stable than $CH _3 \stackrel{+}{ C } H _2$ and $\stackrel{+}{ C } H _3$ is the least stable cation.
→2. Explain why $\left( CH _3\right)_3 \stackrel{+}{ C }$ is more stable than $CH _3 \stackrel{+}{ C } H _2$ and $\stackrel{+}{ C } H _3$ is the least stable cation.