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CLASS - 10 SCIENCE IMPORTANT QUESTIONS OF MARK 1

QUESTION NO. 51

What is exothermic reaction .

ANSWER NO. 51

Reaction in which heat is released along with the formation of products are called exothermic chemical reaction .

QUESTION NO. 52

Decomposition of  vegetable matter is known as 
(a)   Endothermic   
(b)   Exothermic 

ANSWER NO. 52

(b)   Exothermic

QUESTION NO. 53

What is endothermic reaction .

ANSWER NO. 53

Reaction in which energy is absorbed are known as endothermic reaction .

QUESTION NO. 54 

What is precipitation reaction .

ANSWER NO. 54

Reaction which produce a precipitation is called precipitation reaction .

QUESTION NO. 55

The surface of copper powder become coated with black why .

ANSWER NO. 55

This is because oxygen is added to copper and copper oxide is formed .

QUESTION NO. 56

The ashes of magnesium burn is 
(a)   Black
(b)   Brown
(c)   White 
(d)   Pink

ANSWER NO. 56

(c)   White

QUESTION NO. 57 

What is olfactory indicator .

ANSWER NO. 57

There are some substances whose odour changes in acidic or basic media . These are called olfactory indicators . Vanilla , onion and clove can be used as olfactory indicators .

QUESTION NO. 58

Acid change the colour of blue litmus to 
(a)   Yellow
(b)   Black  
(c)   Red 
(d)   None of these

ANSWER NO. 58

(c)   Red

QUESTION NO. 59

What is neutralisation reaction .

ANSWER NO. 59

The reaction between an acid and a basic to give a salt and water is known as neutralisation reaction .

QUESTION NO. 60

What is pH scale .

ANSWER NO. 60

It is a scale for measuring hydrogen iron concentration in a solution called pH scale. Its work within 0 to 14.

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