Question

Note: i) There are 6 very short answer questions in the section.
Section - 1
H
3x2=6
3
ii) Answer any 'Three questions.
til) Ench question carries 2 marks.
iv) Write answers in 1 or 2 sentences for each question.
Differentiate virtual image and real image ?
All the chemical equations must be balanced. Why? Guess and write.
Bee sting leaves a c
hemical substance that causes pain and irritation.
Name the chemical substance. How can we get relief from it?
What are the precautions to be taken while diluting strong acid ?
Focal length of the concave mirror is 8 cm. The object is placed at
16 cm infront of the mirror. Write the position of image and its natu
5.
[Turn a​

Answer 1

All the chemical equation must be balanced to satisfy the law of conservation of mass

EXPLAINATION

In the law of chemical combination , the law of conservation of mass states that mass can neither be created nor be destroyed in a chemical reaction . We balance the chemical equations to satisfy this law .