Which of the following properties is not correct for silicones?

$$ \text { Match the following } $$

List-I (Pollutant concentration limit in water)		List-II (Effect)
(A)	$$ \mathrm{Pb}>50 \mathrm{ppm} $$	(I)	Brown mottling of teeth
(B)	$$ \mathrm{SO}_4^{2-}>500 \mathrm{ppm} $$	(II)	'Blue baby' syndrome
(C)	$$ \mathrm{NO}_3^{-}>50 \mathrm{ppm} $$	(III)	Laxative effect
(D)	$$ \mathrm{F}^{-}>2 \mathrm{ppm} $$	(IV)	Liver damage

The correct answer is

The element whose percentage composition in an organic compound can be determined by Carius method is

' $x$ ' mg of an organic compound was analysed by Kjeldahl method. The ammonia evolved was absorbed in 50 mL of $0.5 \mathrm{M} \mathrm{H}_2 \mathrm{SO}_4$. The unused acid required 60 mL of 0.5 M NaOH solution for complete neutralisation. If the percentage of nitrogen in the compound is 56 , the value of $x$ is