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Subject :NSO    Class : Class 7

Which of the following statements is false regarding physical and chemical properties?

A The composition of matter need not be changed for observing a physical change.
B During a chemical reaction, molecules undergo a change and their concentration keeps decreasing along with time.
C Chemical property is the ability of matter to undergo some chemical change because of its composition.
D During a chemical reaction, same molecules are present throughout the change.


Ans 1: (Master Answer)

Class : Class 1
The correct answer is D.

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Subject :NSO    Class : Class 7

Ans 1:

Class : Class 8
Sakshi's experiment was realllly interesting !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! The ans is [ C ]

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Subject :NSO    Class : Class 7

Ans 1:

Class : Class 7
Option b

Ans 2:

Class : Class 7
Option b

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Subject :NSO    Class : Class 7

Ans 1:

Class : Class 7
But it could be a washing factory in which soap water is thrown out. This will make soil basic.

Ans 2:

Class : Class 7
Factories in general means "manufacturing units" so we can consider that the waste water which is thrown out can be acidic in nature.

Ans 3:

Class : Class 10
It is mentioned that the landowner has decided to use one of his fields which had 'factories' for several years. So it is considered that chemicals from these factories make the soil acidic...

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Subject :NSO    Class : Class 5

Ans 1:

Class : Class 5

Ans 2:

Class : Class 5
OK thanks to tell my mistake especially in this question which was confusing and nice too..

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Subject :NSO    Class : Class 5

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Subject :NSO    Class : Class 5

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Subject :NSO    Class : Class 9

Ans 1:

Class : Class 9

Ans 2:

Class : Class 9
D

Ans 3:

Class : Class 9

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Subject :NSO    Class : Class 6

Fill in the blanks.
The solubility of sugar in water ___(P)___ with an/a ___(Q)___ in ___(R)___ . However, The solubility of salt ___(S)___ very little with temperature.

            P                      Q                      R                      S
A Decreases       Increase       Temperature       Increases
B Increases        Increase        Temperature        Increases
CIncreases         Decrease       Pressure              Decreases
D Decreases      Increase         Pressure              Decreases


i cant understand it at all

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Subject :NSO    Class : Class 5

Ans 1:

Class : Class 6
sorry! just forgot!

Ans 2:

Class : Class 7
Answer should be B. Their answer A should be incorrect.

Ans 3:

Class : Class 6
B. BECAUSE OF MORE VEHICLES THERE IS MORE POLLUTION AND ELECTRIC APPLIANCES CAN DO THE SAME.

Ans 4:

Class : Class 7
Nilesh even I ticked the answer B but the site says answer A.

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