National Science Olympiad Forum By SOF Olympiad Trainer - Page 46

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Subject :NSO    Class : Class 8

Select the correct statements.
(i) Magnesium ribbon on heating in air catches fire and burns with white flame to form magnesium oxide.
(ii) All metals react with water to evolve hydrogen gas.
(iii) Iron reacts with cold water slowly.
(iv) Sodium metal is always kept in kerosene as it reacts vigorously with air and moisture.

A (i) and (iii) only
B (ii) and (iii) only
C (i) and (iv) only
D (ii) and (iv) only


why is option C not the right answer?

Ans 1:

Class : Class 8
why have they missed the letters 'i' and 'n' in the question?or maybe they have marked the wrong answer as the correct onenot agreedSOF PLEASE TAKE NOTE AND CORRECT THE ERROR

Ans 2:

Class : Class 4
It should be c not b or the question should have written incorrectly

Ans 3:

Class : Class 8

Ans 4:

Class : Class 8

Ans 5:

Class : Class 8

Ans 6:

Class : Class 8

Ans 7:

Class : Class 8

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Subject :NSO    Class : Class 6

Ans 1:

Class : Class 6
My answer is option c

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Subject :NSO    Class : Class 5

Ans 1:

Class : Class 5
I know, it's B!

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Subject :NSO    Class : Class 6

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Subject :NSO    Class : Class 7

Sumedha took a spoon of turmeric powder and made a paste by adding little water to it. She cut thin strips of a paper and applied this paste on them. After drying she put few drops of given sample solutions (i)-(iv) on these strips. What would be the changes in the colour she observed?


(i) Amla juice
(ii) Lime water
(iii) Common salt solution
(iv) Baking soda solution

(i) (ii) (iii) (iv)
A Yellow Red Yellow Red
B Red Yellow Yellow Red
C Red Red Yellow Yellow
D Yellow Yellow Red Red


Amla juice is acidicIt is A

Ans 1:

Class : Class 7

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Class : Class 7

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Subject :NSO    Class : Class 6

Ans 1:

Class : Class 3

Ans 2:

Class : Class 1
3 is the correct answer

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Subject :NSO    Class : Class 1

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Subject :NSO    Class : Class 4

Ans 1:

Class : Class 4

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Subject :NSO    Class : Class 4

Ans 1:

Class : Class 4

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Subject :NSO    Class : Class 6

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