National Science Olympiad Forum By SOF Olympiad Trainer

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Subject :NSO    Class : Class 2

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Subject :NSO    Class : Class 2

Ans 1:

Class : Class 3
IT IS A VERY VERY WRONG QUESTION

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Subject :NSO    Class : Class 10

Which of the following statements are incorrect?
I. Reactivity of Al decreases if it is dipped in nitric acid.
II. Carbon can reduce the oxides of Na and Mg.
III. NaCl is a good conductor of electricity in solid state.
IV. Metals like K, Ca and Mg are always found in free state in nature.

A I, II and III only
B II, III and IV only
C I and III only
D II and III only


common salt can never conduct electricity in solid state

Ans 1:

Class : Class 10
B) II,III,IV CARBON can reduce oxides of metals lower in the activity series. K, Ca and Mg are high in the activity series so they are very reactive so they can not be found in free state easily.

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Subject :NSO    Class : Class 6

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Class : Class 8
Ans is D

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Subject :NSO    Class : Class 6

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Class : Class 6
potato and ghee

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Subject :NSO    Class : Class 5

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Subject :NSO    Class : Class 6

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Class : Class 7

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Class : Class 6

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Subject :NSO    Class : Class 6

Ans 1:

Class : Class 6
It will ten centimetres because the length of this is 5 cm [7-2] .

Ans 2:

Class : Class 7

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Subject :NSO    Class : Class 6

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Subject :NSO    Class : Class 10

Observe the given experimental set-up carefully.
image
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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