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16) O p t i o n 2 i s c o r r e c t . K e r o s e n e a n d w a t e r a r e i m m i s c i b l e l i q u i d s w h i c h s e p a r a t e o u t i n l a y e r s d e p e n d i n g o n t h e i r d e n s i t i e s . 17) O p t i o n 3 i s c o r r e c t . G e n e r a l l y t h e c o m p o s i t i o n o f s a m p l e o f s t e e l i s 98 % i r o n, 1.5 % c a r b o n a n d 0.5 % o t h e r e l e m e n t s . 18) O p t i o n 1 i s c o r r e c t . A s a h o m o g e n o u s s o l u t i o n w i l l b e f o r m e d, T h e a m o u n t o f s o l u t e i n B e a k e r B = 4 / 5 x 65 = 52 g A m o u n t o f s o l v e n t i n B e a k e r B = 4 / 5 x 185 = 148 g W e k n o w t h a t w e n e e d t o o b t a i n a c o n c e n t r a t i o n o f 20 % . (w / W) % = \frac{M a s s o f s o l u t e}{M a s s o f s o l u t i o n} x 100 W e n e e d t o o b t a i n a m o u n t o f e x t r a w a t e r n e e d e d t o m a k e a c o n c e n t r a t i o n o f 20 % . 20 = \frac{52}{148 + 52 + x} x 100 200 + x = \frac{52 x 100}{20} 200 + x = 260 x = 260 - 200 = 60 g

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