P-1 Chemical reactions and equations — Science STD 10 — Question

What is the periodic trend observed in the variation of atomic radii down a group?

What are the various steps which can be taken to control (or reduce) pollution caused by burning fossil fuels?

A vacuum cleaner draws a current of 2 from the mains supply.

1. What is the appropriate value of the fuse to be fitted in its circuits?
2. What will happen if a 13A fuse is fitted in its circuit?

Friedrich Wohler converted an inorganic compound into an organic compound in the laboratory.

1. Give the name and formula of inorganic compound.
2. Write the name and formula of organic compound formed.

Explain the term free fall and state the corresponding kinematical equations of motion in the usual

Define watt-hour. How many joules are equal to 1 watt-hour?

Which different materials are decomposed in a bio-gas plant?

A certain form of energy which is not sourced directly or indirectly from the sun and does not cause any pollution is very easily converted into electricity. This form of energy is, however, not available everywhere. Moreover, it is technically very difficult and expensive to obtain it. Name the form of energy.

Write the notes :
Physical Change