Answer the following questions :
Xenon gives a series of fluorides, but Helium and Neon do not. Why?
(At. No: Xe = 54, Ne = 10, He = 2)

Answer the following questions pertaining to the brown ring test for nitric acid : Give a reason why the brown ring does not settle down at the bottom of the rest tube.

Answer the following questions in one word or one sentence: What is 10H_(2)O in Na_(2)CO_(3)*10H_(2)O ?

The diagram below represents a process in plants. The setup was placed in bright sunlight. Answer the following questions : When placed in bright sunlight for four hours, what do you observe with regard to the initial and final weight of the plant? Give a suitable reason for your answer.

Answer the following questions : (a) Why are copper and aluminium used to make electric wires ? (b) What do you understand by the statement : 'metals are ductile and malleable' ?

Answer the following questions : (i) What is meant by chirality of a compound ? Give an example . (ii) Which one of the following compounds is more easily by hydrolyzed by KOH and why ? CH_(3)CHClCH_(2)CH_(3) or CH_(3)CH_(2)CH_(2)Cl

Meeta father was driving her to the school. At the traffice signal she noticed that each traffic light was made of many tiny lights instead of a signal bulb. When Meeta asked this question to her father's he explained the reason for this. Answer the following question based on above information: (i) What were the values displayed by Meeta and her father? (ii) What answer did Meeta's father give? (iii) What are the tiny light in traffice signal called and how do these operate?