Question
Difterentiate between electromagnetic wave and matter wave.

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What is formula of binary compound formed between combination of:
  1. 1st element of 1st group and iodine.
  2. 2nd element of 2nd group with 1st element of 17 group.
Calculate the electron gain enthalpy of fluorine from the data given below: $\Delta_{\mathrm{f}} \mathrm{H}^{\circ}$ of $\mathrm{KF}=-560.8 \mathrm{~kJ} \mathrm{~mol}{ }^{-1}$, Sublimation energy of $\mathrm{K}=87.8 \mathrm{~kJ} \mathrm{~mol}^{-1}$, Dissociation energy of F , is $158.9 \mathrm{~kJ} \mathrm{~mol}{ }^{-1}$, Lattice energy of $\mathrm{KF}^{-15}-807.5 \mathrm{~kJ} \mathrm{~mol}{ }^{-1}$ and Ionisation energy of K is $414.2 \mathrm{~kJ} \mathrm{~mol}^{-1}$.
Lithium hydride can be used to prepare other useful hydrides. Beryllium hydride is one of them. Suggest a route for the preparation of beryllium hydride starting from lithium hydride. Write chemical equations involved in the process.
Predict the formulae of the stable binary compounds that would be formed by the following pairs of elements:
  1. Silicon and oxygen.
  2. Aluminium and bromine.
  3. Calcium and iodine.
  4. Element with atomic number 114 and fluorine.
  5. Element with atomic number 120 and oxygen.
The ring systems having following characteristics are aromatic.
  1. Planar ring containing conjugated $\pi$ bonds.
  2. Complete delocalisation of the $\pi$−electrons in ring system i.e. each atom in the ring has unhybridised p-orbital, and
  3. Presence of (4n + 2)$\pi$−electrons in the ring where n is an integer (n = 0, 1, 2, ..........) [Huckel rule].
Using this information classify the following compounds as aromatic/ nonaromatic.
Element A reacts with aqueous NaOH solution to form B and H . Aqueous solution of B is hetated to $323-33 \mathrm{~K}$ and on passing $\mathrm{CO}_2$ into it, $\mathrm{Na}_2 \mathrm{CO}_3$ and C were formed. When C is heated to $1200^{\circ} \mathrm{C}, \mathrm{Al}_2 \mathrm{O}_3$ is formed. identify A,B, and C and also write the reaction involved.
How many 4d electrons can have spin quantum number $-\frac{1}{2}?$ Explain.
Which out of Li, Na, K, Be, Mg, Ca has lowest ionisation enthalpy and why?
Fe decomposes steam while Cu does not, why?
Classify the organic compounds.