Ions of an element of group 1 participate in the transmission of nerve signals and transport of sugars and amino acids into cells. This element imparts yellow colouctor the flame in flame test and forms an oxide and a peroxide with oxygen. Identify the element and write a chemical reaction to show the formation of its peroxide. Why does the element impart colour to the flame?

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