“We are looking for an alternative or non-conventional source of energy.” State three reason for it.

What is meant by overloading of an electrical circuit? Explain two possible causes due to which overloading may occur in the household circuit. Explain one precaution that should be taken to avoid the overloading of a domestic electric circuit.

i. Shruti draws magnetic field lines close to the axis of a current carrying circular loop. As she moves away from the centre of circular loop, she observes that the lines keep on diverging. Explain the reason for her observation.

ii. Write two properties of magnetic field lines.

i. Identify the acid and the base whose combination forms the common salt that you use in your food. Write the formula and chemical name of this salt. Name the source from where it is obtained.

ii. What is rock salt? Mention its colour and the reason due to which it has this colour.

iii. What happens when electricity is passed through brine? Write the chemical equation for it.

OR

i. Write the chemical name and chemical formula of washing soda.

ii. How is it obtained from sodium chloride? Give equations of the reactions.

iii. Why it is called a basic salt? Give its any one use.

An element placed in 2nd Group and 3rd Period of the Periodic Table, burns in presence of oxygen to form a basic oxide.

i. Identify the element.

ii. Write the electronic configuration.

iii. Write a balanced equation when it burns in the presence of air.

iv. Write a balanced equation when this oxide is dissolved in water.

v. Draw the electron dot structure for the formation of this oxide.