1.Why alkali metals are used in photoelectric cells?
2. Reaction between boron trifluoride with LiAlH4 in diethylether
3. Name intermolecular forces b/w:
a) He atoms in liquid He
b) Two HF molecules
4. CO2 is a gas while SiO2 is a solid. Explain.
5. What is dipole moment in CCl4?

Please help........

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