National Science Olympiad Forum By SOF Olympiad Trainer - Page 132

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Subject :NSO    Class : Class 1

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Subject :NSO    Class : Class 9

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Subject :NSO    Class : Class 1

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Subject :NSO    Class : Class 7

Observe the given reaction carefully and fill in the blanks by choosing an appropriate option.

Fe(s) + CuSO4(aq) FeSO4(aq) + Cu(s)
Before reaction, iron is (i) in colour and solution is (ii) in colour. After reaction iron gets (iii) deposits and the solution becomes (iv) in colour.

(i) (ii) (iii) (iv)
A Grey Colourless Red Blue
B Red Blue Grey Green
C Grey Blue Brown Green
D Red Colourless Grey Green


C is the answer

Ans 1:

Class : Class 8
C is the answer

Ans 2:

Class : Class 7
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Ans 3:

Class : Class 7
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Subject :NSO    Class : Class 3

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Subject :NSO    Class : Class 9

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Subject :NSO    Class : Class 1

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Subject :NSO    Class : Class 7

Preeti has collected some items from her kitchen :
i. Amla
ii. Baking soda
iii. Tamarind
iv. Soap
v. Lime water
vi.Common salt
vii.Sugar
She classified them as acidic, basic and neutral substances.
Which of the following classification is correct?

          Acidic              Basic                Neutral
A(i), (ii)            (iv), (vii)            (iii), (v), (vi)
B(iv), (vi)         (i), (ii), (iii)          (v), (vii)
C(i), (iii)          (ii), (v), (vi)          (iv), (vii)
D(i), (iii)          (ii), (iv), (v)          (vi), (vii)


Ans 1:

Class : Class 9

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