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CLASS - 10 SCIENCE IMPORTANT QUESTIONS OF MARK 1



QUESTION NO. 91 

What are esters ?

ANSWER NO. 91

Esters are sweet smelling substances. These are used in making perfumes and as flavouring agents.

QUESTION NO. 92

What is scum ?

ANSWER NO. 92

When a soap is used in hand water, a solid substance formed is called scum. This is because charged calcium and magnesium particles present in water reacts with soap to form an insoluble substance.

QUESTION NO. 93

Who invented Triads ?

ANSWER NO. 93

German Scientist Johann Walfgang Dobereine.

QUESTION NO. 94

Why Newland arrangement of elements called Law of Octaves ?

ANSWER NO. 94

He found that every eight element had properties similar to that of the first. He compared this to the Octaves found in music. Therefore, he called it the ' Law of Octaves '.

QUESTION NO. 95
How many groups and periods are in modern periodic table ?

ANSWER NO. 95

Modern periodic table has 18 vertical columns known as ' Groups ' and 7 horizontal rows known as ' Periods '.

QUESTION NO. 96

Why should curd and sour substances not to be kept in brass and copper ?

ANSWER NO. 96

Curd and sour substances ( Acidic ) reacts with copper and forms toxic compounds which may be unfit for human consumption and it may cause food poisoning.

QUESTION NO. 97

Name the functional group present in each of the following organic compounds.
(a) CH3COCH3
(b) C2H5COOH

ANSWER NO. 97

(a) Ketone
(b) Carboxylic acid 

QUESTION NO. 98

Why do ionic compounds have high melting point ?

ANSWER NO. 98

Ionic compound have high melting points, because they have high intermolecular force and hence a large amount of energy is required to break the strong bonding.

 QUESTION NO. 99

 Which element has twice as many electron in its second shell as its first shell.
(a)  Neon
(b)  Helium 
(c)  Sodium 
(d) Carbon

 ANSWER NO. 99

 (d) Carbon

 QUESTION NO. 100

 Write the name of dehydrating agent.

 ANSWER NO. 100

 The concentrated sulphuric acid can be regarded as dehydrating agent.

 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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