10.2. Assertion: The ionization enthalpies of the alkali metalsare considerably high and increase down thegroup from Li to Cs.

Reason: The effectof increasing size outweighs the increasingnuclear charge, and the outermost electron isvery well screened from the nuclear charge.

When light of maximum wavelength 300 nm falls on a photoelectric emitter, photoelectrons are liberated. For another emitter however light of maximum wavelength 600 nm causes photoelectric emission. The ratio of work functions of first emitter to second emitter will be

Which one of the alkali metal can directly react with N₂ of air?

Which of the following is arranged in the order of increasing radius of ions in aqueous solution?

Which one of the alkali metal can directly react with N₂ of air?

The formula of washing soda is