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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] MR. D HR UV A S HE R I.C.S .E . B OA RD P A P E R 199 4 (d) A ns w e r t h e f ol l o wi n g q u es ti o ns r el ati n g t o s al t s a n d t h ei r p r e p a r ati o n . (i) 2 [ 6] W h a t i s a S al t ? . . . (ii) W h a t k i n d o f s al t i s p r e p a r e d b y p r e c i pi t a ti o n ? ( D o u bl e d ec o m p o s i ti o n ). . (iii) N a m e a s al t p r e p a r e d by di r ec t c o m bi n a ti o n. W ri t e t h e e q u a ti o n f o r t h e r e a c ti o n t h a t t ak e s pl a c e w h e n p r e p a ri n g t h e s al t y o u h av e n a m e d . . . (iv ) N a m e t h e p r o c e d u r e u s e d t o p r e p a r e a s o di u m s al t e g . S o di u m s ul p h at e . . (e) (i) [ 6] Name t he t wo gases f ormed when candle burns. . (ii) Account f or t he higher percent age of CO 2 in respired air compared t o inspired air. . . (iii) E x pl ai n w h y a m m o n i a g as i s ev ol v e d w h e n w a t e r i s a d d e d t o t h e p r o d u c t fo r m e d w h e n m a g n e s i u m i s b u r n t i n ai r . . (iv ) Name t he process used t o separat e t he const it uent s of liquid air. . (f ) T he f ollow ing quest ions ref er t o one m ole of c hlorine gas. (i) [ 6] W h a t i s t h e v ol u m e oc c u pi e d b y t hi s g as at s .t . p. ? . 98190 53799 . 022 2387 3799 ww w. d h ru v as h e r. c o m MR. D HR UV A S HE R I.C.S .E . B OA RD P A P E R 199 4 (ii) W h a t w i l l h a p p e n t o t h e v ol u m e o f t h e g a s i f t h e p r es s u r e i s d o u bl e d ? (iii) W h a t v ol u m e wi l l t h e g as oc c u py at 2 7 3 o C ? (iv ) 3 If t h e r el a ti v e at o m i c m a s s of c hl o ri n e i s 3 5. 5 , w h a t wi l l b e m a s s o f o n e m ol e of c hl o ri n e g as . . (g) Ans w er t he f ollow ing: - (i) [ 5] What is proton? . (ii) W h a t i s t h e s i g ni fi c a nc e of t h e n u m b e r of p r o t o ns f o u n d i n t h e a t o m s o f e ac h of t h e di f f e r e nt el e m e n ts ? . . (iii) W h a t i s t h e r el a ti o n b e t w e e n t h e n o. of p r ot o n s a n d t h e n o. of el ec t r o ns i n an atom? . (h) F ollow ing quest ion relat es t o elect roplat ing of an art ic le w it h s ilv er: (i) [ 4] N a m e t h e el e c t r o d e f o r m e d b y t h e a r ti c l e t o b e pl at e d . . (ii) W h a t i o n s m u s t b e p r es e n t i n t h e el ec t r ol y t e ? . (iii) W h a t s h o ul d b e t h e n at u r e of t h e a n o d e ? . (iv ) H o w i s t h e p a s s a g e el ec t ri c i ty t h r o u g h t h e el e c t r ol y t e di f f e r e nt f r o m t h e p as s a g e o f el e c t ri c i t y t h r o u g h c o p p e r w i r e ? . . 98190 53799 . 022 2387 3799 ww w. d h ru v as h e r. c o m MR. D HR UV A S HE R I.C.S .E . B OA RD P A P E R 199 4 4 Section B (40 marks) (Attempt any four questions from this section) Question 2 (a) N am e t he ions pres ent in eac h f ollow ing c om ponent s: (i) [ 4] C o m p o u n d A w h e n w a r m e d w i t h c o n c e nt r at e d s ul p h u ri c a c i d gi v es a g a s w hi c h f u m e s i n m oi s t ai r a n d w hi c h gi v e s d e n s e w h i t e f u m e s wi t h a m m o n i a . . (ii) W h e n b a ri u m c hl o ri d e s ol u ti o n i s a d d e d t o a s ol u ti o n o f c o m p o u n d B , a w hi t e p r e c i pi t a t e i n s ol u bl e i n di l ut e hy d r o c hl o ri c a c i d i s f o r m e d . . (iii) A c ti o n o f h e a t o n i ns ol u bl e c o m p o u n d C p r o d uc e s a g as w hi c h t u r ns l i m e w a t e r t u r bi d. . (iv ) C o m p o u n d D w h e n w a r m e d w i t h di l u t e s u l p h u ri c ac i d gi v e s a g as w hi c h tu r n s a c i di fi e d p ot a s s i u m di c h r o m a t e s ol uti o n g r e e n. . (b) W rit e balanc ed equat ions f or act ion of heat on f ollow ing c om pound: [ 3] (i) P ot a s s i u m c hl o r at e . (ii) S o di u m hy d r o g e n c a r b o n a t e . (iii) C o p p e r ni t r a t e . (c ) (i) Name a subst ance which could be mixed wit h pot assium chlorat e so t hat it would decompose f ast er (ii) D e s c ri b e al l t h at y o u w o ul d s e e w h e n c o p p e r ni t r at e i s h e at e d . [ 3] . . . . . . . 98190 53799 . 022 2387 3799 ww w. d h ru v as h e r. c o m MR. D HR UV A S HE R I.C.S .E . B OA RD P A P E R 199 4 5 Question 3 (a) C opy and c om plet e t he f ollow ing t able: ELEM EN T AT OM IC M ASS N U M BER N U M BER B e ry l l i u m 4 Fl u o ri n e [ 5] N U M BER OF PR OT ON S N EU TR ON S ELEC T R ON S 9 9 10 S o di u m 12 A l u mi ni u m P h os p h o r u s (b) 27 11 13 31 15 T h e el ec t r o ni c s t r uc t u r e ( c o nfi g u r a ti o n) o f Fl u o ri n e c a n b e w r i t t e n a s 2 , 7 . [ 2] In a s i mi l a r w a y gi v e t h e el e c t r o ni c c o nfi g u r ati o n of : (i) A l u mi ni u m ; (ii) P h os p h o r us . . . (c ) (i) [ 3] S h o w t h e f o r m a ti o n of c a r b o n t e t r ac hl o ri d e m o l ec ul e us i n g a n el e c t r o n d ot a n d c r os s di a g r a m . (ii) S t a t e t w o di f f e r e nc e s y o u w o u l d e x p ec t t o fi n d b e t w e e n t h e p r o p e rti e s o f C a r b o n t e t r ac hl o ri d e a n d S o di u m c hl o ri d e. 98190 53799 . 022 2387 3799 ww w. d h ru v as h e r. c o m MR. D HR UV A S HE R I.C.S .E . B OA RD P A P E R 199 4 6 Question 4 (a) T he f ollow ing st at em ent s are c orrect only under c ert ain c ondit ions. R ew rit e [ 4] eac h st at em ent inc luding t he appropriat e c ondit ion(s ) underlined in y our ans w er. F or ex am ple: St at em ent : Sodium c hloride react s w it h silv er nit rat e f orm ing a prec ipit at e of s ilv er c hloride. C orrec t st at em ent : Sodium c hloride s olution reac ts w it h s ilv er nit rat e s olut ion f orm ing a prec ipit at e of s ilv er c hloride. (i) O x al i c a c i d r e a c t s w i t h s ul p h u ri c a c i d t o p r o d uc e c a r b o n m o n o x i d e a n d c a r b o n di ox i d e . . . (ii) Chlorine reacts wit h sodium hydroxide solut ion t o produce sodium chlorat e. (iii) C o p p e r a n d ni t ri c ac i d r e ac t t o g et h e r p r o d uc i n g ni t r o g e n di ox i d e . . . (iv ) Sulphur dioxide is a beaching agent . (b) W rit e equat ions f or t he f ollow ing react ions : (i) Format ion of sodium chlorat e f rom sodium hydroxide. (ii) P r o d uc ti o n o f ni t r o g e n di o x i d e u s i n g c o p p e r. [ 4] . (iii) C a r b o n m o n o x i d e a c ti n g as a r e d u c i n g a g e nt . . (iv ) S ul p h u r di o x i d e a c ti n g as a n o x i di z i n g a g e nt . . (c ) (i) [ 2] How would you remove t he carbon dioxide f rom a carbon dioxide and carbon monoxide mixt ure? (ii) W h y i s c o p p e r n o t u s e d t o p r e p a r e hy d r o g e n b y t h e a c ti o n of di l ut e hy d r o c hl o ri c ac i d o r di l u t es ul p h u ri c a c i d o n t h e m e t al ? . . . . 98190 53799 . 022 2387 3799 ww w. d h ru v as h e r. c o m MR. D HR UV A S HE R I.C.S .E . B OA RD P A P E R 199 4 7 Question 5 (a) A n a c i d o f p h o s p h o r us h as t h e f ol l o w i n g p e rc e n t a g e c o m p o s i ti o n : 2 . 4 7 % [ 4] hy d r o g e n , 3 8 . 2 7 % p h o s p h o r us , 5 9 . 2 6 % o x y g e n. Fi n d t h e e m pi ri c al f o r m ul a of t hi s a c i d a n d i ts m ol e c ul a r f o r m ul a , gi v e n t h at i ts r el a ti v e m ol e c ul a r m a s s i n 1 6 2. ( H = 1 , O = 1 6 , P = 3 1 ) . (b) P h os p h o r u s h a s s ev e r al al l ot r o p e s . N a m e t w o ot h e r el e m e n ts w hi c h al s o [ 2] h av e al l ot r o p e s . . (c ) T h e r e ac ti o n b e t w e e n al u mi ni u m c a r bi d e a n d w a t e r t a k es pl ac e ac c o r di n g t o [ 3] th e f ol l o w i n g e q u a ti o n: A l 4 C 3 + 1 2 H 2 O 3 C H 4 + 4 A l ( O H ) 3 C al c ul at e t h e v ol u m e o f m e t h a n e ( C H 4 ) , m e a s u r e d a t s . t. p ., r el e as e d f r o m 1 4. 4 g o f al u m i ni u m c a r bi d e by ex c es s w at e r . ( C = 1 2 , A l = 2 7 ) (d) W ri t e t h e e q u a ti o n f o r t h e a c ti o n of h e at o n al u m i ni u m hy d r o x i d e. [ 1] . 98190 53799 . 022 2387 3799 ww w. d h ru v as h e r. c o m MR. D HR UV A S HE R I.C.S .E . B OA RD P A P E R 199 4 8 Question 6 (a) (i) [ 3] C opy and c om plet e t he f ollow ing t able: N am e of N am e of Approx im at e Produc t C at alys t T em perat ure H a b e r s P r oc e s s O s t w al d s P r oc e s s (ii) F o r t h e H a b e r s P r o c es s s t a t e t h e a p p r o x i m a t e p r e s s u r e . . (iii) H o w i s t h e t e m p e r a t u r e m a i nt ai n e d i n t h e O s t w a l d s P r oc e s s ? . . (b) W ri t e e q u a ti o n f o r t h e l a b o r a t o ry p r e p a r a ti o n of : [ 3] (i) A m m o ni a f r o m a m m o n i u m c hl ori d e . (ii) Ni tri c a c i d f r o m p ot a s s i u m ni t r at e . (c) (i) (ii) Answer t he f ollowing: [ 4] What is meant by t he f ixat ion of nit rogen ? St at e t wo ways in which f ixat ion of nit rogen occurs nat urally 98190 53799 . 022 2387 3799 ww w. d h ru v as h e r. c o m MR. D HR UV A S HE R I.C.S .E . B OA RD P A P E R 199 4 9 Question 7 (a) [ 5] (i) G i v e t h e n a m e a n d f o r m ul a of t h e o r e o f z i n c . (ii) W ri t e e q u a ti o ns f o r t h e f ol l o w i n g s t e p s i n e x t r a c ti o n of z i n c : (1) R o a s ti n g o f t h e o r e . . (2) R e d u c ti o n o f t h e z i nc c o m p o u n d w h i c h i s t h e p r o d u c t of t h e a b ov e r e ac ti o n. . (iii) What , in addit ion t o a zinc compound, is put int o t he blast f urnace. (iv ) St at e one large scale use of zinc. (b) (i) [ 4] W h a t i s t h e p u r p o s e o f t h e C o n t a c t p r oc e s s ? . (ii) W h a t t w o g as e s a r e c o m b i n e d d u ri n g t h e C o nt a c t p r oc e s s ? . (iii) N a m e t h e c at al y s t u s e d i n t h e p r oc e s s . . (c ) W ri t e t h e e q u a ti o n f o r t h e r e a c ti o n b et w e e n z i nc a n d t h e fi n al p r o d u c t of t h e C o n t ac t p r o c es s . . 98190 53799 . 022 2387 3799 ww w. d h ru v as h e r. c o m [ 1]

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