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Iba Khan from DPS , Noida
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:

Ashmi Narkar from The Shishukunj International School, Jhalaria Campus, Indore
Class : Class 9
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:

ALICE from Delhi Public School, UDAIPUR
Class : Class 9

Ans 3:

NIVED PRAKASH NAIR from SARVODAYA, THIRUVANANTHAPURAM
Class : Class 8

Ans 4:

Advay Das from Delhi Public School, Gurgaon
Class : Class 5
It should be c not b or the question should have written incorrectly

Ans 5:

vishant mishra from Deens Academy, Bengaluru
Class : Class 2

Ans 6:

Advika Narkar from The Shishukunj International School, Jhalaria Campus, Indore
Class : Class 8
Actually, the question should be,"Select the incorrect statements.". Or they must have marked the wrong answer according to the question. SOF, kindly rectify this error.

Ans 7:

NIVED PRAKASH NAIR from SARVODAYA, THIRUVANANTHAPURAM
Class : Class 8

Ans 8:

ALICE from Delhi Public School, UDAIPUR
Class : Class 9

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