Chemical Reactions and Equations CBSE Class X Important Notes

1)Chemical reaction— Chemical changes or chemical reactions are the changes in
which one or more new substances are formed.
2)Chemical Equations – Representation of a chemical reaction in terms of symbols and
formulae of the reactants and products is known as chemical equation.
3)Balanced Chemical equation

Class X Science Exemplar Solutions:Acids Bases and Salts

EXEMPLAR PROBLEMS – SCIENCE Class X Acids Bases And Salts solutions
 

Ans. Lactic Acid: Curd
        Acetic Acid: Vinegar
       Citric Acid: Lemon
       Oxalic Acid: Tomato

Acids Bases and Salts MCQs

Multiple Choice Questions from Acids Bases and Salts

1. What happens when a solution of an acid is mixed with a solution
of a base in a test tube?
(i) The temperature of the solution increases
(ii) The temperature of the solution decreases
(iii) The temperature of the solution remains the same
(iv) Salt formation takes place
(a) (i) only (b) (i) and (iii)
(c) (ii) and (iii) (d) (i) and (iv)

2. An aqueous solution turns red litmus solution blue. Excess
addition of which of the following solution would reverse the
change?
(a) Baking powder
(b) Lime
(c) Ammonium hydroxide solution
(d) Hydrochloric acid

How to Learn first 20 Elements of Periodic Table

Here is an easy mnemonic device to learn the first twenty elements of period table.This will be very useful in determining the valencies of these elements

CBSE Class 10:Metals and Non Metals Part 1

Here are Important Notes and points for CBSE Class 10th science third chapter Metals and Non metals.

Physical Properties of Metals

1. Metals are Malleable, that is, they can be beaten into sheets
2. Metals are Ductile, they can be drawn into thin wires
3. Metals are good conductor of heat and electricity
4. Metals are lustrous and shiny, they can be polished