Science and Technology (I) d p L $rs ról$p rhje : rhop A s Óop (cpn - 1) NyZ : 40 ^p fz : 10 dy kde : 2 L$gpL$ k Q p : (1) b^p âñp DL $ghp afrs>eps R>. (2) S>êf S>Zpe Ðep h opr_l$ A_ sp ról$ v$rôa ep Áe _pdr_v$ ris ApL $rsap v$p fp. (3) v$f L$ dy e âñ gmhp_u iêaps _hp `p_ L$fhu. (4) S>dZu bpsy>_p A L$ NyZ v$ip h R>. (5) blº`ep eu âñp dpv$ (â. 1b), â\d DÑf _ S> Ýep_dp g hpdp Aphi. (6) blº`ep eu âñp _p DÑf, `ep e ¾$dp L$ kp\ gmhp. Dv$p. (i) a.... (ii) c.... â.1 (A) _uq _p âñp DL $gp. (NyZ 5) (i) `v$p\ _y âhpludp \u ^_dp ê`p sf \su hms `v$p\ _u AâNV$ Dódp... (ii) _uq _u fpkperzl$ âq¾$ep_p âl$pf Ap mmp. 12 22 O 11 D 12 + 11 2 O (iii) X$p b fpe_f_p ÓeL$ Li, Na, K dp rgr\ad A_ `p V$ riad_p `fdpzycpf A_y¾$d 6.9 A_ 39.1 R>. sp kp qx$ad_p `fdpzycpf L $V$gp? (iv) `l gp klk b ^_ Ýep_dp g buå klk b ^ ` Z L$fp. l$bg v$ fbu_ : c ` ów\u KQp 569 km. lbg v$ fbu u c dz L$np : (v) bpsy>_u ApL $rs_y r_funz L$fu_ âl$pi_p h¾$uch_ rhi ep Áe A_ydp_ gmp. O dpýed psmy dpýed 1
â.1 (B) Ap gp ep edp u ep Áe ep e k v$ L$fp. (NyZ 5) (i) uq u ApL $rs y r funz L$fu ep Áe ep e k v$ L$fp. A B (a) A dp p Qy bl$ue n Ó u suh sp h^y R>. (b) B dp p Qy bl$ue n Ó u suh sp h^y R>. (c) A A B dp p Qy bl$ue n Óp u suh sp kdp R>. (d) A A B dp Qy bl$ue n Ó u suh sp Ap R>u R>. (ii) A L$ rhûp }A brlnp m L$pQ u dv$v$ u bpfu u N ug u õ ô ârsdp X$v$p f d mhu. f sy rinl $ s bpfu bv$g v$ f Aph gp A L$ TpX$ u ârsdp g hp y L$üy. kyõ ô ârsdp d mhhp dpv$ L$pQ... (a) X$v$p sfa Mk X$hp X$i (b) X$v$p u v$ f Mk X$hp X$i (c) X$v$p pr>m d L$hp X$i (d) X$v$p u M b S> v$ f d L$hp X$i. (iii) Zn, Fe, Al A u ^psyap q¾$epiugsp p QY$sp ¾$ddp Np W$hsp ep Áe dp X$Zu L$? (a) u, Fe, Zn, Al (b) Al, u, Fe, Zn (c) Zn, Al, u, Fe (d) Fe, Zn, Al, u (iv) uq y fq p k Ó ¼ep L$pb r L$ k ep S> y R>. (a) L$ f (b) b ÞTu (c) õv$pq (d) ÁgyL$p T (v) Å A L$ ìer¼s y Q Ö f hs> 9 N lp e sp s y Õhu f y hs> L $V$gy li? (a) 3 N (b) 15 N (c) 45 N (d) 54 N 2
â.2. uq p âñp DL $gp. (L$p Z p Q) (1) rh^p 1 : rhûys âhpl L$pfZ (Bg ¼V²$p p âhpl L$pfZ ) rhûys Ahfp ^dp DóZsp r dp Z pe R>. rh^p 2 : rhûys Ahfp ^dp DóZsp EÅ Anesp p r ed A ykpf S> r dp Z pe R>. rh^p 1 A rh^p 2 u klpesp u õ ô L$fp. (2) âep N v$fçep õhfpgua L$f gy r funz uq Apàey R>. Ap r funz f u s Dv¹$ch gp âñp p DÑf Ap p. õhfpgu p âep N v$fçep âl$pi O dpýeddp u psmp dpýeddp âh isu hms õs rcl$p u v$ f S>sp S>Zpep. õhfpgua Ap psl$p Z(i) y d ëe h^pfsp, h¾$uc sl$p Z(r) y d ëe Z h^sy Ney. f sy Qp ½$k Ap psl$p Z R>u âl$pi p ql$fzp O dpýeddp pr>p afsp Å hp dýep. s u õhfpgu p d dp L $V$gpL$ âñp Dv¹$cìep. s p S>hpb gmp. (a) (i) p rhriô d ëe iy L$l hpe R>? s kde r y d ëe L $V$gy lp e R>? (b) âl$pi p ql$fzp p O dpýeddp pr>p afhp u âq¾$ep iy L$l hpe R>? s âq¾$ep kdåhp. (3) uq L$u spfpap p V$dV$dhp y ep Áe L$pfZ L$ey? s L$pfZ õ ô L$fp. (a) spfpap dp kde kde sp rhõap V$ (b) spfpap p âl$pi y hpsphfzdp ip jphy (c) spfpap u Nrs (d) hpsphfz p hpey p bv$gpsp h¾$uch p L$. (4) A ^psy p fdpzy ¾$dp L$ 11 R>. b ^psy p fdpzy¾$dp L$ 20 R>. Ap b ^psydp u, L$B ^psy h^pf q¾$epiug R>. ^psy A u kp çe lpex²$p ¼gp qfl$ A rkx$ l kp su âq¾$ep gmp. (5) rd u Bg ¼V²$p - V$ L$p k fq p A fq pk Ó Apg Mp. (6) A L$ N l y Öìedp Õhu p Öìedp L$fsp 8 NZy h^pf R> A róäep Õhu u róäep L$fsp bdzu lp e sp s N l f p dyr¼sh N L $V$gp li? ( Õhu f p dyr¼sh N = 11.2 km/s) (7) AhL$pi Arcep A V$g iy? AhL$pi Arcep u S>êqfeps A dlðh sdpfp iåv$p dp gmp. â.3. uq p âñp EL $gp (L$p Z p Q) (NyZ 15) (1) A L$ v$x$p V$ bg f u uq X $ R> A 1 k L $X$dp S>du f lp Q R>. g=10 m/s 2 lp e sp V$ bg u KQpB A S>du f lp Qsp kde v$x$p p h N L $V$gp li? (2) uq p fpkperzl$ kdul$fz f u sd iy kdäep s gmp. AgNO 3 (aq) + Nal (aq) Agl + NaNO 3 (aq) 3
(3) uq Ap gu lpex²$p L$pb u kfm i Mgp y r funz L$fp A R> gp âñp p S>hpb gmp. (i) lpex²$p L$pb A A B u kfm i Mgp L$u k s á A Ak s á lpex²$p L$pb i Mgp L$? A (ii) Ap i Mgp p pdp gmp. (iii) AZyk Ó gmu 2 OV$L$p u k ep gmp. (4) (i) bpsy> u ApL $rs f u ¼ep rkùp s õ ô pe R>. (ii) Ap rkùp sdp bm u qv$ip ip ^hp dpv$ ¼ep r ed p D ep N L$fhpdp Aph R>? (iii) Ap rkùp s p D ep N ¼ep e Ódp L$fhpdp Aph R>? s e Ó p L$pe v$ip hsu ApL $rs v$p fp. B õv X$ sp bp p spf (5) uq u L $rs p Aæepk L$fp A R> gp âñp p S>hpb gmp. L $rs 1 : (1) kdp Öìedp ^fphsp gp M X$, kuky A sp bp p ½$f Np mp gp. (2) ÓZ e Np mp L $V$gpL$ kde ky^u DL$msp pzudp fpmp. (3) L $V$gpL$ kde R>u s d DL$msp pzudp u blpf L$pY$$p. s d sfs duz p ÅX$p f f d L$p. (4) v$f L$ Np mp duzdp L $V$gp uq ky^u Nep? p ^ L$fp. âñ : (i) ApL $rs Üpfp v$p p ¼ep NyZ^d p Aæepk L$fu il$pi? (ii) s NyZ^d V $ L$dp hz hp. (iii) Ap S> L $rs p Ap^pf DóZsp rhr de p rkùp s kdåhp. (6) uq p ApL $rsb ^ Z L$fu uq Ap gp âñp p S>hpb Ap p. L$pQu ^psy p kl $ÞÖL$fZ u Ý^rsAp $NyêÐhue Õ L$fZ Ý^rs r npg (i) p h n y s g kl $ÞÖL$fZ u L$ Ý^rsdp hp fhpdp Aph R>? (ii) kl $ÞÖL$fZ u s Ý^rs V $ L$dp kdåhp. 4
(7) Mpgu S>Áepdp ep Áe DÑf gmu gp M X$ p L$pV$ gpnhp u âq¾$ep kdåhp. Ap âq¾$ep p ârsb ^ dpv $ A L$ D pe k Qhp. gp M X$ f... âq¾$ep L$pfZ L$pV$ gpn R>. gp M X$ p $cpn f p Sy>v$p -Sy>v$p cpn ^ pn A GZpN b R>. * ^ pn f su fpkperzl$ âq¾$ep Fe (s) Fe 2+ (aq) + 2e * GZpN f su fpkperzl$ q¾$ep O 2 (g) + 4 + (aq) +... 2 2 O (l) ^ pn f u Fe 2+ Ape p õ mp sf v$fçep... kp âq¾$ep Fe 3+ Ape s epf pe R>.... dp u AÖpìe gpg f N p ks>g Ap ¼kpBX$ s epf pe R> s S> L$pV$ L$l hpe R>. 2Fe 3+ (aq) + 4 2 O (l)... + 6 + (aq) ârsb ^pðdl$ D pe... â.4 uq p âñp EL $gp (L$p Z A L$) (NyZ 5) (1) A L$ d möìe y g ¼V²$p k ê Z 2,8,2 R>. s p Ap^pf uq p âñp p DÑf gmp. (i) Ap d möìe p fdpzy¾$dp L$ L $V$gp? (ii) Ap d m Öìe p b ^ pl$ L $V$gp? (iii) Ap d möìe p NZ ¼ep? (iv) Ap d möìe ¼ep Aphs dp R>? (v) Ap d möìe p fpkperzl$ NyZ^d uq L$u ¼ep d möìe S> hp li? 7 N, 4 Be, 18 Ar, 17 l (2) (i) bpsy> u ApL $rsdp v$ip h gu fq p ¼ep k ÿdv$i L$dp Å hp dm R>? (ii) ApL $rs ep Áe pd Ap p (iii) Ap k ÿdv$i L$ e Ódp L$ fus L$pe pe R> s gmp. (iv) Ap k ÿdv$i L$ p D ep N ¼ep L$fhpdp Aph R>? (v) Ap k ÿdv$i L$ u L$pe ndsp h^pfhp dpv$ A L$ D pe k Qhp. 5