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CLASS - 10 SCIENCE IMPORTANT QUESTIONS OF MARK 1

QUESTION NO. 61

How does the flow of acid rain water into a river make the survive of aquatic life in the river difficult .

ANSWER NO. 61

Living organism can survive only in a narrow range of pH change i.e. 7.0 to 7.8 when pH of rain water is less than 5.6 , is called acid rain . When acid rain flows into the rivers , it lowers the pH of river water . The survival of aquatic life in such rivers becomes difficult .

 QUESTION NO. 62

 Write the chemical name which is used as antacid in case of excess acid formation .

 ANSWER NO. 62

 Magnesium hydroxide ( Milk of Magnesia )

 QUESTION NO. 63

 Tooth decay starts when the pH of the mouth is -
(a)   75.5
(b)   <5.5

 ANSWER NO. 63

 (b)   <5.5    less than 5.5

 QUESTION NO. 64 

 What is chlor - alkali process .

 ANSWER NO. 64

 When electricity is passed through an aqueous solution of sodium chloride , it decomposes to form sodium hydroxide . This process is called chlor - alkali process .

 QUESTION NO. 65

 Write the chemical name of bleaching powder .
(a)   Nacl 
(b)   CaCO3
(c)   CaOCl2
(d)   Ca (OH)2
ANSWER NO. 65

(c)   CaOCl2

 QUESTION NO. 66

 Write the chemical formula of baking soda.

 ANSWER NO. 66

 Sodium hydrogencarbonate (NaHCO3)

 QUESTION NO. 67

 Write the chemical name of washing soda.

 ANSWER NO. 67

   Na2CO3.10H2O

 QUESTION NO. 68

 Write the chemical name of Plaster of Paris.

 ANSWER NO. 68

 Calcium sulphate hemihydrate CaSO4.1/2 H2O

 QUESTION NO. 69

 Define the following -
(a)  Malleability
(b)  Ductility

 ANSWER NO. 69

 (a) Malleability :  When metals can be beaten into thin sheet. This property is called malleability.

 (b) Ductility :  The ability of metals to be drawn into thin wire is called ductility.

 QUESTION NO. 70

 Write the name of metals which are good conductor of heat .

 ANSWER NO. 70

 Copper and silver.


ALSO SEE IMPORTANT QUESTION OF 1 MARK

 From question no. 31 to 40

From question no. 1 to 10

From question no. 21 to 30

From question no. 41 to 50

From question no. 51 to 60

From question no. 61 to 70

From question no. 71 to 80

From question no. 81 to 90

From question no. 101 to 110

From question no. 111 to 120

From question no. 121 to 130

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