chapter 1

Take half kg of water in a vessel. Note its temperature Heat it for exactly 2 minutes using a Bunsen burner. Again note down its temperatur..

Write oxidation number of each atom and split the equation into two half equations: In this reaction, zinc undergoes oxidation and NO 3 - undergoes reduction..

Ionization of Na ( g ) to Na + ( g ) In this step, energy equal to the ionisation energy of sodium is absorbed...

Multiplying by 4 times the coefficient of x 2 on both sides i.e., 4..

In (a + b) n , the constants a and b must be positive. ..

Question: Which of the following equations have x=2, y=3 as solution ? (a) 8x-y = 12 (b) 2x+3y = 10 Answer: (a) Substitute x=2, y=3 in 8x-y=12 8(2)-3=12 16-3=12 x=2, y=3 is not a solution of 8x-y=12 (b) Substitute x=2, y=3 in 2x+3y=10 2(2)+3(3)=10 4+9=10 x=2, y=3 is not a solution o..

For cubic crystals of elements (e.g., Fe, Cu) Let edge length = a pm Number of atoms per unit cell = Z Atomic mass of the element = M Volume of Unit cell = (a pm) 3 = a 3 x 10 - 3 0 cm Mass of unit cell = Number of atoms per unit cell x Mass of each atom = Z x m where, ..

Let n = 2k The number of terms is n+1 i.e., 2k+1. The middle term has k terms before it. ..

Sulphur dioxide is prepared by burning sulphur or iron pyrites. ..

It is carried out by burning powdered sulphur or roasting of sulphur rich ores...