,urhadf; fzpj;jy;fs; gy;nju;t tpdhf;fs;...,dhy; tyg;ghhj;j nghj mjd; 25cm3 njitg;gl;lj. nkw;gb...
TRANSCRIPT
,urhadf; fzpj;jy;fs;
gy;Nju;T tpdhf;fs;
(2019/old & new /mcq 04)
(2019/old & new /mcq 19)
(2018/mcq/06)
(2018/mcq/19)
5) jpzpTg;gb 75% KHCO3 If; nfhz;l KHCO3, CaCO3 jpz;kf;fyitapdJ 0.8g Kw;whfg;gpupAk;
tiu caH ntg;gepiyf;F ntg;gg;gLj;jp epak ntg;g mKf;f epge;jidapy; FspHtpf;Fk; NghJ
ngwg;gLk; CO2 thAtpd; fdtsT ( K – 39, Ca – 40, C – 12, O – 16, H – 1)
(1) 0.1792 dm3 (2) 0.0672 dm3 (3) 0.112 dm3 (4) 0.0448 dm3 (5) 0.168 dm3
(2017/mcq 08)
1)
2)
3)
4)
6) fe;jfj;ij fiue;j epiyapy; nfhz;Ls;s C7H16 khjpupapd; 13.2g MdJ 1.3mol O2 cld; %ba
ghj;jpunkhd;wpy; fyf;fg;gl;L Kw;whf jfdkhf;fg;gl;L FspHtpf;fg;gl;lJ. ,jd; NghJ 14.4g ePH
ngwg;gl;lJ. ,q;F ngwg;gl;l thA tpisT vJTk; ePupy; fiuatpy;iy vdf; nfhz;L jfd
,Wjpapy; fhzg;gLk; O2, CO2, SO2 thAf;fspd; nkhj;j %y;fs;
(1) 0.75 (2) 0.8 (3) 0.85 (4) 0.9 (5) 0.95
(2017/mcq 13)
7) A vd;Dk; NrHitahdJ Brypd; jfdj;jpd; %yk; cUthFk; Gifapd; msitf;
Fiwg;gjw;fhf NrHf;fg;gLk; vupnghUl; NrHkhdkhFk;.
A ,d; 1 %ypid Kw;whf jfdkilar; nra;tjw;F Njitahd xl;rprd; thAtpd; %y;
msT
(1)8 (2) 8.5 (3) 9 (4) 9.5 (5) 10
(2016/mcq16)
;fl;Liu tpdhf;fs;
01)
CuS, FeS, ZnS, rlj;Jt khR Mfpatw;iw nfhz;l jpz;kf; fyitnahd;wpd; 4.0 g MdJ kpif 0.3
mol dm-3 mkpy KMnO4 fiurypd; 200 cm3 cld; gupfupf;fg;gl;lJ. ntspNaWk; SO2 thAit Kw;whf
mfw;Wtjw;fhf fiury; ntg;gg;gLj;jg;gl;lJ. mj;Jld; tpisthFk; Mn2+ ck; tpNrl nrad;Kiw
xd;wpd; %yk; mfw;wg;gl;L ngwg;gl;l tpisTf; fiury; Z gpd;tUk; eilKiwfSf;F
cl;gLj;jg;gl;lJ.
eilKiw : 01
fiury; Z ,d; 100 cm3 vLf;fg;gl;L 1 mol dm-3 Fe2+(aq) cld; epakpf;fg;gl;l NghJ mjd; 25
cm3Njitg;gl;lJ.
eilKiw : 02 fiury; Z ,d; gpwpnjhU 50 cm3 vLf;fg;gl;L kpif NH3 fiury; ,lg;gl;L
ngwg;gLk; tPo;gbT tbj;J khwhj;jpzpT ngwg;gLk; tiu td;ikahf ntg;gg;gLj;jg;gl;l NghJ
0.16 g jpz;k kPjp ngwg;gl;lJ.
eilKiw : 03 eilKiw 02 ,ypUe;J ngw;w tbjputj;jpw;F kpifasT Ijhd mkpyk;
Nru;f;fg;gl;L mNkhdpah KOtJk; eLepiyahf;fg;gl;l gpd;du; kpifahf KI(aq) Nru;f;fg;gl;lJ.
tpLtpf;fg;gl;l I2(aq) I epakpf;f 0.2 mol dm-3 Na2S2O3 fiurypd; 30.0 cm3 Njitg;gl;lJ.
1. eilngWk; jhf;fq;fSf;fhd rkg;gLj;jpa rkd;ghLfis jUf.
2. khjpupapYs;s CuS, FeS, ZnS ,d; jpzpTr; rjtPjq;fisf; fzpf;f.
(Cu- 63.5, Fe- 56, Zn- 65, S- 32, O- 16, H- 1)
(2019/B/8/c)
(2018/B/8/c)
02)
03) ePupd; td;ikahdJ ePupy; Ca2+, Mg2+ cg;Gf;fs; fiue;jpUg;gjdhy; vOfpd;wJ. ePupd;
epiyapy; td;ikahdJ Ca2+, Mg2+ ,d; ,UfhgNdw;Wf;fshYk;> epiyahd td;ikahdJ ,t;
mad;fspd; FNshiul;L> ry;Ngw;W cg;Gf;fs; ,Ug;gjdhYk; Vw;gLfpwJ. XH ePHf;fiurypy; cs;s
Ca2+, Mg2+ mad;fspd; nkhj;j msit Jzptjpy; EDTA[H2Y2-] cld; epakpj;jy; xU
nghUj;jkhd eltbf;ifahFk;. ,e;epakpg;gpd; Jy;ypakhd KbTepiyia fz;lwptjw;F
Erichrome black T (In) vd;Dk; fhl;b gad;gLj;jg;gLfpwJ. ,f;fiurypd; pH 10 I tpl caHthf
cs;sNghJ fhl;bahdJ cNyhf maDld; NrHe;J itd; rptg;G [wine red] epwkhf fhzg;gLk;
mNjNtis ,f;fhl;bahdJ H+ cld; NrHe;J RahjPdkhf ,Uf;Fkhapd; ePyepwkhfTk;
fhzg;gLk;.
MIn- + H2Y2-→ HIn2- + MY2- +H+
(Wine red) (Blue)
(,q;F M MdJ Ca2+ my;yJ Mg2+ IAk; In vd;gJ fhl;biaAk; Fwpf;Fk;)
khztd; xUtd; ePHkhjpupapy; cs;s epiyahd td;ikia Jzpa gpd;tUk; eilKiwfis
gpd;gw;wpdhd;.
eilKiw I:- td;ePH khjpupapd; 50cm3MdJ epakpg;G FLitapDs; vLf;fg;gl;L pH I 10
,y; epiyepWj;Jtjw;fhf NH4Cl/ NH4OH jhq;fw; fiurYk;> rpwpjsT
fhl;bAk; NrHf;fg;gl;L tpisTf; fiury; 0.1moldm-3 nrwpTs;s EDTA
fiurYld; tYg;ghHf;fg;gl;lJ. fiury; nkd;rptg;gpy; ,Ue;J ePykhf khWk;
NghJ Njitg;gl;l EDTA ,d; fdtsT 22cm3 MFk;.
eilKiw II:- Nkw;gb td;ePH khjpupapd; gpwpnjhU 25cm3 khjpupahdJ rpyJsp nkjapy;
nrk;kQ;rs;fhl;b Kd;dpiyapy; Fwpj;j nrwpTila HCl ,dhy;
tYg;ghHf;fg;gl;lJ. fiury; nrk;kQ;rspy; ,Ue;J rptg;ghf khWk; NghJ
Njitg;gl;l HCl ,d; fdtsT 30cm3MFk;.
eilKiw III:- eilKiw II ,y; gad;gLj;jg;gl;l HCl fiurypd; 20cm3 ,Ds; kpifasT
KIO3, KI vd;gd NrHf;fg;gl;L ngwg;gl;l tpisTf;fiury; khg;nghUs; fhl;b
Kd;dpiyapy; 0.04moldm-3 Na2S2O3 ,dhy; tYg;ghHj;j NghJ mjd; 25cm3
Njitg;gl;lJ.
Nkw;gb td;ePH khjpupapd; epiyahd td;ikia [Permanent hardness] CaCO3 mgdm-3 rhu;ghff;
fhz;f? (Ca-40 , C- 12 , O-16 )
(2017/B/8/c)
(2016/B/8/c)
05) a. KMnO4 khjpup xd;W khrhf MnO2 I nfhz;Ls;sJ. ,k;khjpupapd; 3.32g jpzpTf;F rpwpJ
kpifahf KI ck; dil H2SO4 ck; ,lgg;ll;d. ntspgg; ll; I2 ,id Kww; hf epakpff; 2.0moldm-3
Na2S2O3 ,d; 45cm3 Njitg;gl;lJ
i. eilngWk; jhf;fq;fspd; <Lnra;j rkd;ghLfs; jUf.
ii. khjpupapy; KMnO4 ,d; J}a;ikapd; E}w;WtPjk; ahJ?
b) vitamin C vd;gJ Ascorbic acid C6H8O6 MFk;. ,J xU jho;j;Jq; fUtp. I2(aq) ,id gpd;tUkhW
jho;j;Jk;.
C6H8O6(aq) + I2(aq) → C6H6O6(aq) + 2HI(aq)
Njhlk;go kzKila nkd;ghdnkhd;wpidj; jahupg;gjw;F ,t; Ascorbic acid gad;gLfpwJ.
,g;ghdnkhd;wpd; 50.0cm3 MdJ 10.0cm3, 0.05moldm-3 KIO3 ePu;f;fiurYlDk; rpwpJ kpifahd KI
clDk; Nru;j;J ed;F FYf;fg;gl;lJ. jhf;fk; Kw;Wg; ngw;wgpd; tpisTf; fiurypy; vQ;rpAs;s
I2 ,id Kw;whf epakpg;gjw;F 0.030moldm-3, 30.0cm3, Na2SO3 fiury; Njitg;gl;lJ. vdpd;
nkd;ghdj;jpy; Ascorbic acid ,d; mikg;ig fhz;f.
(2015/B/8/c)
04)
tpilfs;
gy;Nju;T tpdhf;fs;
1) 4 2) 1 3) 5 4) 2 5) 3 6) 4 7) 2
fl;Liu tpdhf;fs;
01)
02)
03)
04) 04)
hgfkjgflkh