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

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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 s-block elements do not give characteristic colours in the flame test ?
\( \mathrm{Li}, \mathrm{Be}, \mathrm{Ca}, \mathrm{Ba}, \mathrm{Sr}, \mathrm{Mg}, \mathrm{Na}, \mathrm{K}, \mathrm{Cs} \)
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