Chemical Reactions and Equations — Science STD 10 — Question

Label correctly the diagram of Nuclear power plant.

i. Define vestigial organs.
ii. Write name of any two vestigial organs in human body.
iii. Explain how one human vestigial organ is functional in another animal.

How do nonmetals react with water?

A washing machine rated 300 W operates one hour/day. If the cost of a unit is ₹ 3.00, find the cost of the energy to operate the washing machine for the month of March.

Write merits of Mendeleev's periodic table.

Rearrange the columns 2 and 3 so as to match with the column 1.

Column 1	Column 2	Column 3
i. Triad	a. Lightest and negatively charged particle in all the atoms	1. Mendeleev
ii. Octave	b. Concentrated mass and positive charge	2. Thomson
iii. Atomic number	c. Average of the first and the third atomic mass	3. Newlands
iv. Period	d. Properties of the eighth element similar to the first	4. Rutherford
v. Nucleus	e. Positive charge on the nucleus	5. Dobereiner
vi. Electron	f. Sequential change in molecular formulae	6. Moseley

State the importance of Space Mission.

How is zinc extracted from its carbonate ore (calamine)? Explain with equations.

Complete the given chart:

Sr. No.	Body Constituents	Proteins/Amino Acids
1.	Blood	__________________
2.	__________________	Ossein
3.	Skin	__________________
4.	__________________	Insulin
5.	Muscle	__________________
6.	__________________	Various proteins of cell membrane

How do you calculate valency of an element from its electronic configuration?