PART - 2 CH - 9 Hydrocarbons — Chemistry STD 11 Science — Question

Describe the hybridisation in case of PCl₅ . Why are the axial bonds longer as compared to equatorial bonds?

Classify the following substances into oxidising and reducing agents:

1. Carbon.
2. Ozone.
3. Nascent hydrogen.
4. Nitric acid.
5. Chlorine.

How much energy is required to ionise a H atom if the electron occupies n = 5 orbit? Compare your answer with the ionization enthalpy of H atom (energy required to remove the electron from n = 1 orbit).

Why is a solution of potassium hydroxide used to absorb carbon dioxide evolved during the estimation of carbon present in an organic compound?

Calculate the pH of a buffer which is 0.1M in acetic acid and 0.15M in sodium acetate. Given that the ionisation constants of acetic acid is 1.75 × 10^-5. Also calculate the change in pH of the buffer if to 1L of the buffer (i) 1cc of 1M NaOH are added. (ii) 1cc of 1M HCl are added. Assume that the charge in volume is negligible. (iii) What will be the buffer index of the above buffer?

Draw the cis and trans structures of hex-2-ene. Which isomer will have higher b.p. and why?

Explain Heisenberg's uncertainty principle and also explain its importance.

First member of each group of representative elements (i.e., s and p-block elements) shows anomalous behaviour. Illustrate with two examples.