The answer to questions is a single digit integer, ranging from 0 to 9 . If the correct answers ...

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The answer to questions is a single digit integer, ranging from 0 to 9 . If the correct answers to the question numbers A, B, C and D (say) are 4, 0, 9 and 2 respectively, then the correct darkening of bubbles should be as shown on the side :
How many of the following metals when heated in an atmosphere of \( \mathrm{N}_{2} \) gas form nitrides?
Li, Na, K, Rb, Cs, Mg, Ca, Sr, Ba
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