Bộ giáo dục và đào tạo kì thi chọn học sinh giỏi quốc gia lớp 12 THPT năm 2004 Hớng dẫn chấm đề thi chính thức Môn: hoá học - Bảng B 11/3/2004 Câu I (4 điểm): 1. 1.5điểm ; 2. 1 điểm ; 3. 1,5 điểm 1 !""#$%&' ( )* + ' , -.,/0* + ' + 12 +3 2' + -.10* + ' + 42' ( 5 2 +3 2-674$* + 8 + 09 5 0* + '0 +3 0* : ;0! + * ) + '074$ <=>?@A$%74%B*CD $$AE.DF ?@A< 3G??@H5,IJK:L? MJ 0H,IN()L? MJ -O( @4<=>J 74 ( P"QARS+74 + .-5 T?B*CD H ớng dẫn giải: J <=$&' ( )* + 'U">V!* + ' ( W&' ( * + 'XA<DP1D 0* : Y74* + 'UZ[ V!* + ' ( W&' ( * + '3( * : V!* : ( W&' ( * + '3(* + ' ,\] * + ' + 3+^ +'* 5 &F4 2 +3 3('* 5 5+^ 2' + 3+* + '&F1 2 +3 3* + ' + 3+'* 5 2' + 3+* + ' _1]F@ +2' ( 5 3`* : ' 3 3)^ 2 +3 3J+* + '&F4 )* + ' + 3+* + '5+^ ' + 3+* : ' 3 &F1 + +2' ( 5 3)* + ' + 3K* : ' 3 +2 +3 3)' + 3J(* + ' +a$>* + 8 + 0 +3 0* : ;.<@47AQ>@.=> ?@A$%74% $>9 5 0* + '0! + * ) + '<@47AQ>@<=>?@ A$%74% Ja`-B . . . H C H H O H . . . F O H H C 2 H 5 O C 2 H 5 H O H O 3\]"bHQDP∆*cν d 5ν e d e e -A<0e??@P0PeUb0b>PHD PA1]fd fd e ?G?H?@P0PeA< ,\]#=$% • gDP( ( !J <∆* J c(d 5d ( ch0h5)× JK: ; $T∆* J c5`J)L • gDP ( + + !+ <∆* + c(d 5+d + ch0h5+× N() ; $T∆* + c5J`NhL -b ∆* + < ∆* J TDP( + + 1DT? DP( ( C©u II (4 ®iÓm): 1. 1.5 ®iÓm ; 2. 2 ®iÓm ; 3. 1 ®iÓm 1iA7<, jbB*CD k 3 0 3 0l 3 08^ +3 02 +3 26; + &' ( $&&' ( $%b$bARAA>A""m ,CUQA[n\AmEA[; 3 $& +3 8IUQA[@ P 6H; + &' ( ?J0)Jh 5) 0H&&' ( ?+0`Jh 5o 3&p19^'<bq>=?T7"Q!S=?$% .6>ch0(:h*C 6?@H=p1A< H íng dÉn gi¶i: 1. k 3 8^ +3 8^ +3 $k 3 AE^?^ G 3 2 +3 $%0rU8^ +3 AQ l 3 >7R jHk 3 D T6)8^ +3 <, jb + ; + &' ( ↓+; 3 3&' ( +5 fV; 3 W + V&' ( +5 WcJ0)Jh 5) &&' ( ↓& +3 3&' ( +5 fV& +3 W V&' ( +5 Wc+0`Jh 5o -Om6 6b; + &' ( R@<=D&&' ( b.A=?&' ( +5 ""m T1]; + &' ( ↓+; 3 3&' ( +5 f sSEA[&' ( +5 ?10<V; 3 W + V&' ( +5 Wc!+1 + cJ0)Jh 5) -OA<<1cJ0))Jh 5+ ?a?@[Ag + ] = 2 x = 3,1 . 10 -2 mol/l. n&&' ( ↓& +3 3&' ( +5 <-cV& +3 W J0))Jh 5+ c+0`Jh 5o T [Sr 2+ ] = 1,8.10 -5 mol/l. tD@?u$EA[&' ( +5 "&&' ( >?J0`Jh 5) ?a??vj +a`-B ∑ ∑ : s6$%=?T7"Q!S0.>U<6A$mbq? 46 2 1 8 8 1 =+ xx !- <=$Y 6A$mbq@ T 6?@H=A<? ( ) )cm/g(91,5 10.022,6.10.432,0 )168,55(4 d 3 23 3 7 = + = − C©u III(6,5 ®iÓm): 1. 3 ®iÓm ; 2. 3,5 ®iÓm 1X"m;E8!' : + h0hKh2$;' : h0hJ+2 -@Ol + ' ( $""m;A"<Q1wB ,-@)h0h?l + ' ( h0+oh2$Jhh0h?""m; - EA[A 2-,AET,$HDPAC1w T,""m\E8 +3 09^ +3 0g, +3 0 :3 0' : 5 8' ( ↓ 3* + ' 8 +3 3*' ( 5 3'* 5 flcJh 5Jo0(: ; + ' ( 3* + ' +; 3 3*' ( 5 3'* 5 flcJh 5JN0)h l H*' ( 5 ,IK0)h H íng dÉn gi¶i: J *Q<H8' ( $; + ' ( \]PF1bQH s=,pAZ<8' ( ↓ + − > 2 4 2 4 Ba )BaCrO(s CrO C K C !J s=,pAZ<; + ' ( ↓ + − > Ag 2 )CrOAg(s CrO C K C 42 2 4 !+ s= 6l Zx7,I 8' ( ↓ 8 +3 3' ( +5 l J * + ' * 3 3'* 5 l y ' ( +5 3* 3 *' ( 5 l 5J 8' ( ↓3* + ' 8 +3 3*' ( 5 3'* 5 <lcl J l y l 5J :a`-B & 93,9 14 50,643,17 w a 1s 10 10 10.10 K K.K K − − −− === ; + ' ( ↓ +; 3 3' ( +5 l + * + ' * 3 3'* 5 l y ' ( +5 3* 3 *' ( 5 l 5J ; + ' ( ↓3* + ' +; 3 3*' ( 5 3'* M <lcJh 5JN0)h 12 14 50,650,19 2s 10 10 10.10 K − − −− == -O!J M10.96,1 060,0 10 C 9 93,9 CrO 2 4 − − => − -O!+ M10.94,6 )012,0( 10 C 9 2 12 CrO 2 4 − − => − z.R0$$TY<QH$ H 8' ( 1bQ%[ 0A<AH$7H; + ' ( !Aj >$8' ( ${1bQ ,&@l + ' ( M090,0 000,150 00,50x270,0 C 2 4 CrO == − f M040,0 000,150 00,100x060,0 C 2 Ba == + M0080,0 000,150 00,100x0120,0 C 2 Ag == DP 8 +3 3' ( +5 8' ( ↓ h0h(Kh0hNh - h0h)h +; 3 3' ( +5 ; + ' ( ↓ h0hh`hh0h)h - h0h(K -ZDP 8' ( ↓f; + ' ( ↓f' ( +5 !h0h(K2 (a`-B C CrO 4 2- (BaCrO 4 ) C CrO 4 2- (Ag 2 CrO 4 ) ; + ' ( ↓ +; 3 3' ( +5 Jh 5J+ 8' ( ↓ 8 +3 3' ( +5 Jh 5N0N: EA[' ( +5 "?%0<=EA[' ( +5 "+H?. A= ' ( +5 3* + ' *' ( 5 3'* 5 l , cJh 5o0) h0h(K [ ] !h0h(KM111 5,7 2 10 x046,0 x − = − 1c:0`Jh 5) zzh0h(Kf [ ] M046,0CrO -2 4 = [ ] [ ] M10.55,2 046,0 10 Ba ;M10.66,4 046,0 10 Ag 9 93,9 2 6 0,12 − − + − − + == == V8 +3 W$V; 3 WARzzV' ( +5 W0PjEA[' ( +5 "+H? .A=T""m< V8 +3 Wc+0))Jh 5N 2fV; 3 Wc(0KKJh 5K 2f V' ( +5 Wch0h(K2fV'* 5 Wc:0`Jh 5) 2fV* 3 Wc+0K:Jh 5Jh 2f Vl 3 Wc l3 ch0J`2f 0,088M. C - 3 NO = + + H 2 SO 4 BaSO 4 + PbSO 4 Cr 3+ , Fe 2+ + NaOH + NaOH dr+ H 2 O 2 BaSO 4 g,' + 9^!'* : ' ( 2- 2- 2- lHp&' ( 0'* 5 lHAj7X"m$ + HNO 3 PbSO 4 lHp!S3* + &Hg,&A^ X"m\(Ba 2+ , Fe 2+ , Pb 2+ , Cr 3+ , NO 3 - ) )a`-B 8 +3 3*&' ( 5 8&' ( ↓ 3* 3 g, +3 3*&' ( 5 g,&' ( ↓ 3* 3 * 3 3'* 5 * + ' g,&' ( ↓3('* 5 g,' + +5 3&' ( +5 3* + h g,' + +5 3&' ( +5 3(* 3 g,&' ( ↓ 3+* + ' !g,' + +5 3+* + & g,&↓ A^3+* + ' :3 3:'* 5 !'* : ↓ !'* : ↓3'* 5 ' + 5 3+* + ' +' + 5 3:* + ' + 3+'* 5 +' ( +5 3(* + ' 9^ +3 3+'* 5 9^!'* + ↓ +9^!'* + 3* + ' + 9^!'* : ↓ C©u IV (5 ®iÓm): 1. 2 ®iÓm ; 2. 1,5 ®iÓm ; 3. 1,5 ®iÓm 1l '7A[$"#$%^?,!*,H^ :'3(*,→*, ( !' : &6?QFQ>+h h $RA[DP EA[!µ?? 5J -6A[7|*, !µ?? 5J 5J ' *, J0)h +0)h +0)h +0)h +0)h (0hh J0h) J0o) +0`h *C 6A[DPEA['?J0:hf*,?:0+h!AR^µ?? 5 J >+h h 2<A`hh h [,7.= J? PJh0h 1,$)0K11*C 6? ,<, 26?1,,AZ7|= 6=H, D,I,@B8>QA[A< ' + ,<b?h0Nh: 3->+h h 0 DP* + !38 + !?j+*8!!J <I67,Il cN0hJh JK l Q!}> *C l HDP* + !38 + !+*8!!+ >+h ' $bch0+) ,*C,F="m7,IHDP!+D= ,DPU ~-,.<8 + !?jf~~-,<8 + !?j * %"•D J -%D1AmAF,THDP • l Q,T@ZHDP^b*,?10^'?0< A[!Am?T6A[HDP Ka`-B 8 + ! $ c 1 *, ' !J • -^Am€0<=,=m6A[DP@^6A[ 7|*,0€?$ cJa($ 7|*, !+ Ghi chó AC•″6A[7|*, I @.7"{"b5 T<?@Q$ cJa($ 7|*, c 1 *, ' !: • -^PF@1666?Q QA? - Q6 EA[!µ?? 5J -6A[7|*,!µ?? 5J 5J ' *, J + : J0)h +0)h +0)h +0)h +0)h (0hh J0h) J0o) +0`h -1]}66A[DPA=1Am1$!: ~$ + a$ J c!+0)ha+0)h 1 !+0)haJ0)h cJ×! J0Ko cJ0o)aJ0h) ! J0Ko cJ0KocJ ~ $ : a$ + c!(0hha+0)h 1 !+0)ha+0)h c+0`haJ0o)f ! J0Kh 1 cJ0Kh1cJ XA<A[!Am?T6A[HDP $ c *, ' !( s= I66A[DP0O!(< c$ a *, ' !) - m,O: QU,D@0S?b6?QHJ : QU,D@0‚>?b6?QH Q6JA $!)0 A cch0ho!µ?? 5J 5J ,s mH$O A0EA[bAR,AC$ !(A= $ $ ch0ho×J0:h×:0+hch0+NJ+!µ?? 5J 5J + %ARQAC,<DP ' : ⇌'3' + !!~ -,}< ' + tDA<? ? U0< cc ch0hJ!?Tch0hJ? T1] -^AR,0?' : $,7.? cch0J? k' : AC,m7 }?h0hJ? &F<SH)0K'$?' : n?>.DU%vD $bU>p= .A= ,tD?' : $,7.,m7 0b ' + $• ?h0Nh:!$DP!~A>%7,I oa`-B g ƒ- h0Nh:×J0h h0h`+h)(× Jho:0J) ' + ' : Jh Jhh J0h) (×+0)h×J0)h XA< cƒ-agch0J×h0h`+h)(×Jho:0J)ah0Nh:cN0o)!? 3. gDP* + !38 + !?j +*8!!J <!l J c + *8 a* + ! nDP* + !38 + ! +*8!!+ <!l + c + *8 a* + ×8 + !, \]7,I8 + !?j 8 + !!: <!l : c8 +! ! lx!J$%!:<7,I!+ * + !38 + !?j +*8!!J 8 + !? 8 + !!: !JM!:* + !38 + ! +*8!!+ T!l + ccc:0KJh Jo ! ,lD= ,DP€?Gb@ZH Q \] „c + *8 a* + ×8 + !" - J l.<,?j,gDP!+<x6? %$ DP,I!∆ch@FAxbA<."•%="m 7,I!+ - + <,?j,b@ZH * + 0*8Gf ?qA<b@ZH8 + ?>.Ax"n8 + ?j -^!"0$6_H*8?%6_H* + @FGb<@"•A FG„$7,I!+="m^Rm `a`-B !l J !l : N0h×Jh JK h0+) . B giáo dục và đào tạo kì thi chọn học sinh giỏi quốc gia lớp 12 THPT năm 2004 Hớng dẫn chấm đề thi chính thức Môn: hoá học - B ng B 11/3 /2004 Câu I (4 điểm): 1. 1.5điểm. 1iA7<, j b B *CD k 3 0 3 0l 3 08^ +3 02 +3 26; + &' ( $&&' ( $% b $ b ARAA>A""m ,CUQA[nAmEA[; 3 $& +3 8IUQA[@ P. g,' + 9^!'* : ' ( 2- 2- 2- lHp&' ( 0'* 5 lHAj7X"m$ + HNO 3 PbSO 4 lHp!S3* + &Hg,&A^ X"m(Ba 2+ , Fe 2+ , Pb 2+ , Cr 3+ , NO 3 - ) )a`- B 8 +3 3*&' ( 5