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Subject :NSO    Class : Class 10

Observe the given experimental set-up carefully.
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Which of the following could be the possible observation and inference drawn?

A The solution becomes blue-green due to formation of copper oxide, P is acidic.
B The solution becomes blue-green due to formation of copper chloride, P is basic.
C The solution becomes white due to formation of calcium hydroxide, P is basic.
D The solution becomes white due to formation of calcium oxide, P is acidic.


the correct answer should be (b) because copper cant displace h2 from HCl

Ans 1: (Master Answer)

Class : Class 1
Yes, the correct answer is B.

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Subject :NSO    Class : Class 4

Ans 1:

Class : Class 5
The Answer is C. NOW THE QUESTION IS HOW? THE ANSWER IS THE MACHINES SHOWN IN PICTURE A,B,D RUNS BY MUSCULAR . FORCE. THE OPTION C RUNS BY MOTOR.

Ans 2:

Class : Class 4
C auto motor other we should ride

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Subject :NSO    Class : Class 10

Four students P, Q, R and S noted the initial colour of the solutions kept in beakers I, II, III and IV. After inserting zinc rods in each solution and leaving them undisturbed for two hours, the colour of each solution was again noted in the form of table given below :

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Which student noted the colour change in all the four beakers correctly?

A P
B Q
C R
D S


the correct answer is not given because acc. to reactivity series only beaker 1 will have some change

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Subject :NSO    Class : Class 3

Ans 1:

Class : Class 3
how?

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Subject :NSO    Class : Class 2

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Subject :NSO    Class : Class 5

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Subject :NSO    Class : Class 6

Ans 1:

Class : Class 6
the answer is (a) because the more the height of the ramp the more you need to give force

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Subject :NSO    Class : Class 2

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Subject :NSO    Class : Class 4

Ans 1:

Class : Class 4
Rotation of earth causes day and night and change of seasons.

Ans 2:

Class : Class 7
Rotation causes day and night. While revolution causes change in season.

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Subject :NSO    Class : Class 4

Ans 1: (Master Answer)

Class : Class 1
The correct answer is A.

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