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ICSE Board Exam 1994 : Chemistry

9 pages, 78 questions, 31 questions with responses, 40 total responses,    0    0
Siddharth Chhetri
Sarwan Memorial School (SMS), Banarhat, Jalpaiguri
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MR. D HR UV A S HE R I.C.S .E . B OA RD P A P E R 199 4 1 ICSE-1994 Section A (40 Marks) (Attempt all questions from this section) Question 1 (a) Ans w er t he f ollow ing: (i) [ 5] N a m e t h e c h a n g e o f s t a t e i n w hi c h n a p h t h al e n e c h a n g es i nt o v a p o u r . . (ii) N a m e a n el e m e n t w h i c h c a n u n d e r g o t h e s a m e c h a n g e o f s t a t e . (iii) N a m e a c o m m o n s u b s t a n c e w h i c h ex i s ts i n al l t h e t h r e e s t at e of m a tt e r . . (iv ) Di l u t e h y d r oc hl o ri c a c i d i s a d d e d i n t u r n to a m i x t u r e o f i r o n a n d s ul p h u r a n d t o t h e c o m p o u n d f o r m e d b e t w e e n i r o n a n d s ul p h u r . N a m e t h e g as fo r m e d i n e ac h c a s e . . . (b) (i) [ 2] P l ac e t h e m e t a l s c al c i u m , i r o n , m a g n e s i u m a n d s o di u m i n o r d e r of t h ei r ac ti v i ty wi t h w a t e r , pl a c e t h e m o s t a c ti v e fi rs t. . (ii) W ri t e e q u a ti o ns f o r e ac h of t h e a b ov e m e tal s w h i c h r e ac t w i t h w a t e r. [ 2] . . . . (c ) (i) (1) C al c i u m . (2) S ul p h ur . [ 2] W h a t d o y o u s e e w h e n e ac h of t h e f ol l o w i n g el e m e n t s i s b u r n t i n ox y g e n ? . (ii) W h a t ty p e of ox i d e i s f o r m e d w h e n e a c h of t h e f ol l o w i n g el e m e n t i s b u r nt i n ox y g e n ? (1) P h os p h o r us . (2) M a g n es i u m . . 98190 53799 . 022 2387 3799 ww w. d h ru v as h e r. c o m [ 2]

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