NCERT Exemplar XX — task. Science CBSE, Class 10.

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Multiple Choice Questions:

1. which of the following elements will form an acidic oxide?

An element with atomic number = 3
An element with atomic number = 17
An element with atomic number = 12
An element with atomic number = 7

2. Which of the following set of elements is written in order of their increasing metallic character?

F, N, Cl
Mg, Al, Si
Na, Li, K
Be, Mg, Ca

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