12th Chemistry Practice Exam Paper 2025 PDF

SAMPLE QUESTION PAPER FOR PRACTICE ONLY HIGHER SECONDARY EXAM 2025 SUBJECT- CHEMISTRY (Hindi & English Version) Total Questions Total Printed Time (Hours)...

SAMPLE QUESTION PAPER FOR PRACTICE ONLY HIGHER SECONDARY EXAM 2025 SUBJECT- CHEMISTRY (Hindi & English Version) Total Questions Total Printed Time (Hours) Maximum Pages Marks 20 11 03:00 Hrs. 70 funsZ'k % (i) lHkh ç'u djuk vfuok;Z gSA (ii) ç'u Øekad 1 ls 5 rd oLrqfu"B ç'u gSa ftuds dqy vad 28 gSaA (iii) ç'u Øekad 6 ls 12 rd] çR;sd ç'u 2 vad dk gSA ¼'kCn lhek 30 'kCn½ (iv) ç'u Øekad 13 ls 16 rd] çR;sd ç'u 3 vad dk gSA ¼'kCn lhek 75 'kCn½ (v) ç'u Øekad 17 ls 20 rd] çR;sd ç'u 4 vad dk gSA ¼'kCn lhek 120 'kCn½ (vi) ç'u Øekad 6 ls 20 rd çR;sd esa vkarfjd fodYi fn;s x;s gSA Instruction (i) All Questions are compulsory. (ii) Question Nos 1 to 5 are objective type question each carries 1 mark total 28 Marks. (iii) Question Nos 6 to 12 each question carries 2 marks. (word limit 30 words) (iv) Question Nos 13 to 16, each question carries 3 marks. (word limit 75 words) (v) Question Nos 17 to 20, each question carries 4 marks. (word limit 120 words) (vi) Internal choice is given in every question from question Nos. 6 to 20. 1- lgh fodYi pqudj fyf[k, & 1x6=6 vad (i) gsujh ds fu;e dk lw= gS & (a) P = KH /x (b) x - KH / p (c) P = KH - x (d) KH = P - x (ii) ejD;wjh lsy dk mi;ksx fuEu esa ls fdl ;qfDr esa ç;qDr gksrk gS & (a) Jo.k ;a= (b) nhoky ?kM+h (c) dkWy cSy (d) vykeZ ?kM+h (iii) laØe.k rRo vuqpqEcdh; O;ogkj çnf'kZr djrs gSa] D;ksfa d muesa gksrs gS & (a) iw.kZ iwfjr d{kd (b) ;qfXer bysDVªkWu ;qDr d{kd (c) v)Z iwfjr d{kd (d) fjDr d{kd 1 (iv) dsUæh; /kkrq vk;[email protected] ls tqM+s fyxS.M ¼layXuh½ dh la[;k dgykrh gS & (a) vkWDlhdj.k la[;k (b) leUo;u e.My (c) vip;u la[;k (d) milgla;kstu la[;k (v) çkFkfed ,sehu dh lajpuk & (a) leprq"Qydh; (b) v"VQydh; (c) f=dks.kh; (d) fijkfeMh; (vi) TohVj vk;u dh mHk;/kehZ çd`fr dk dkj.k gS & (a) vEyh; lewg dh mifLFkfr (b) {kkjh; lewg dh mifLFkfr (c) nks {kkjh; lewgksa dh mifLFkfr (d) ,d vEyh; o ,d {kkjh; lewg dh mifLFkfr Choose and write the correct option – (i) Formula of Henry's Law is. (a) P = KH /x (b) x - KH / p (c) P = KH - x (d) KH = P - x (ii) In which of the following device mercury cell is used - (a) Auditory device (b) Wall clock (c) Call bell (d) Alarm clock (iii) Transition elements show paramagnetic behavior because the possess - (a) Full filled orbital (b) Paired electron orbital (c) Half filled orbital (d) Vacant Orbital (iv) Number of Ligands attached with central metal ion/atom is called - (a) Oxidation Number (b) Co-ordination sphere (c) Reduction Number (d) Co-ordination number (v) Structure of Primary amine is - (a) Tetrahedral (b) Octahedral (c) Trigonal (d) Pyramidal (vi) Amphoteric nature of Zwitter ion is due to - (a) Presence of acidic group (b) Presence of basic group (c) Presence of two basic group (d) Presence of one acidic & one basic group 2 2- fjDr LFkku Hkfj;s & 1x6=6 vad (i) lksMk okVj esa foys; izkoLFkk -------------------- gSA (ii) ,uksM ij ---------------------- vfHkfØ;k gksrh gSA (iii) foVkfeu B-12 esa ---------------------- dsUæh; /kkrq ijek.kq gSA (iv) jtr niZ.k ijh{k.k ---------------------- n'kkZrs gSA (v) çkFkfed ,sehu] f}rh; ,sehu dh rqyuk esa ---------------------- {kkjh; gSA (vi) ;fn 'kdZjk esa çdk;kZRed lewg -CHO gks rks ;g ---------------------- 'kdZjk gSA Fill in the blanks - (i) Solute phase in soda water is..................... (ii)................. reaction occurs at Anode. (iii) Central metal atom in vitamin B-12 is..................... (iv).................. shows silver mirror test. (v) Primary amines are................. basic than secondary amine. (vi) If a sugar contains functional group -CHO then sugar is....................... 3- lR;@vlR; fyf[k, & 1x6=6 vad (i) foy;u nks ;k nks ls vf/kd vo;oksa dk lekaxh feJ.k gksrk gSA (ii) çfrjks/k dk O;qRØe pkydRo dgykrk gSA (iii) C2H5OH eksuksgkbfMªd ,sYdksgkWy ugha gSA (iv) lksfM;e cst a ks,V dk mi;ksx [kk| ifjj{k.k esa gksrk gSA (v) ekYVsl ,Utkbe ekYVksl ds Xywdkst esa tyvi?kVu dks mRizsfjr ugha djrk gSA (vi) gkeksZUl jDr dh /kkjk ls 'kjhj esa çokfgr gksdj mikip;h fØ;kvksa dk fu;eu djrs gSA Write True / False. (i) Solution is the homogeneous mixture of two or more than two components. (ii) Reciprocal of resistance is conductance. (iii) C2H5OH is not a monohydric alcohol. (iv) Sodium benzoate is used as a food preservative. (v) Maltase enzyme does not catalyze the hydrolysis of maltose to glucose. (vi) Hormones regulate the metabolic process in body through the flow of blood. 3 4- lgh tksM+h cukb;s & 1x5=5 vad (i) çkFkfed lsy (a) ÝhvkWu (ii) lfØ;.k ÅtkZ (b) ,LVjhdj.k (iii) ikWyh gSyks,sYdsu (c) ÅtkZ vojks/k (iv) dkcksZDlfyd vEy (d) jatd (v) ,stkscst a hu (e) vuqRØe.kh; Match the column (i) Primary Cell (a) Freon (ii) Activation energy (b) Esterification (iii) Polyhaloalkane (c) Energy barrier (iv) Carboxylic acid (d) Dyes (v) Azo benzene (e) Irreversible 5- ,d 'kCn@okD; esa mRrj fyf[k, & 1x5=5 vad (i) dSMfe;e esa v;qfXer bysDVªªkuksa dh la[;k fyf[k,A (ii) Cr3+ vk;u dk jax fyf[k,A (iii) dSVd s kWy dh lajpuk fyf[k,A (iv) f}rh;d ,sYdksgkWy ds vkDlhdj.k ls çkIr gksus okys mRikn dk uke fyf[k,A (v) Xywdkst dh czksehu ty ls fØ;k gksus ij çkIr ;kSfxd dk uke fyf[k,A Write answer in one word / sentences (i) Write the number of unpaired electrons present in cadmium. (ii) Write the colour of Cr3+ ion. (iii) Write the structure of Catechol. (iv) Write the name of product obtained from oxidation of secondary alcohol. (v) Write the name of compound obtained by the reaction of Bromine water with glucose. 6- fof'k"V pkydrk dh ifjHkk"kk ,oa bdkbZ fyf[k,A 2 vad Write the definition and unit of specific conductivity. vFkok or lsy fLFkjkad dh ifjHkk"kk ,oa bdkbZ fyf[k,A Write the definition and unit of cell constant. 4 7- jklk;fud vfHkfØ;k ds osx dks ifjHkkf"kr dj fyf[k,A 2 vad Define the rate of a chemical reaction vFkok or vfHkfØ;k dh vkf.odrk dks ifjHkkf"kr dj fyf[k,A Define the molecularity of a reaction. 8- ySUFksukbM ds nks mi;ksx fyf[k,A 2 vad Write two uses of Lanthanides vFkok or KMnO4 ds nks mi;ksx fyf[k,A Write two uses of KMnO4 9- milgla;kstu la[;k dh ifjHkk"kk o ,d mnkgj.k fyf[k,A 2 vad Write the definition and one example of co-ordination number. vFkok or dsUæh; /kkrq ijek.kq dh ifjHkk"kk o ,d mnkgj.k fyf[k,A Write the definition and one example of central metal atom. 10- fuEufyf[kr milgla;kstu ;kSfxdksa ds lw= fyf[k,A 2 vad ¼i½ ikSVsf'k;e VsVªkgkbMªªkfDlMks ftadsV ¼II½ ¼ii½ VsVªk,sehu ,DokDyksfjMks dksokYV ¼III½ DyksjkbM Write the formula of following co-ordination Compounds. ¼i½ Potassium tetrahydroxido zincate (II) ¼ii½ Tetrammine aquachlorido cobalt ¼III½ Chloride vFkok or fuEufyf[kr milgla;kstu ;kSfxdksa ds IUPAC uke fyf[k,A ¼i½ [Pt (NH3)2 Cl (NO2)] ¼ii½ [Co(Cl)2 (en)2] Write the IUPAC name of following co-ordination compounds. ¼i½ [Pt (NH3)2 Cl (NO2)] ¼ii½ [Co(Cl)2 (en)2] 5 11- okbfufyd gSykbM o ,sfjy gSykbM esa ,d varj fyf[k,A 2 vad Write one difference between Vinylic halide and aryl halide. vFkok or ,sfyfyd gSykbM o csfUtfyd gSykbM esa ,d vUrj fyf[k,A Write one difference between Allylic halide and Benzylic halide. 12- euq"; ds 'kjhj esa foVkfeu& C lafpr ugha gksrk] D;ksa \ 2 vad Vitamin – C is not stored in human body, Why ? vFkok or euq"; ds 'kjhj esa foVkfeu&D lafpr gks tkrk gS] D;ksa \ Vitamin – D is stored in human body, Why ? 13- mu vfHkfØ;kvksa dh dksfV dh x.kuk dhft;s] ftudk osx O;atd gS & 3 vad ¼i½ osx = K [A] 1/2 [B] 3/2 ¼ii½ osx = K [A] 3/2 [B] -1 Calculate the order of reaction which has rate expression – ¼i½ Rate = K [A] 1/2 [B] 3/2 ¼ii½ Rate = K [A] 3/2 [B] -1 vFkok or fuEufyf[kr osx fLFkjkadksa ls vfHkfØ;k dksfV dh igpku dhft;sA ¼i½ K = 2.3x10-5 L mol-1 S-1 ¼ii½ K = 3x10-4 S-1 Identify order of reaction by following rate constant – ¼i½ K = 2.3x10-5 L mol-1 S-1 ¼ii½ K = 3x10-4 S-1 14- d CykWd ds rRo ifjorhZ vkWDlhdj.k la[;k çnf'Zkr djrs gSa D;ksa \ mnkgj.k fyf[k,A 3 vad d- block elements exhibit variable oxidation state, why ? Write with example. vFkok or d CykWd ds rRo pqEcdh; xq.k çnf'kZr djrs gS] D;ksa \ mnkgj.k fyf[k,A d- block elements exhibit magnetic properties why ? Write with example. 6 15- czkseksC;wVsu ds pkj leko;oh;ksa esa SN1 o SN2 vfHkfØ;k dh vfHkfØ;k'khyrk dk Øe vuqekfur dj fyf[k,A 3 vad Assume the order of reactivity of SN1 and SN2 Reaction for four isomers of Bromobutane. vFkok or fuEufyf[kr dkcZfud ;kSfxdksa dh lajpuk fyf[k,A (i) 2 & Dyksjksa & 3 & esfFkyisUVsu (ii) 1] 4 & MkbczkseksC;wV & 2 & bZu (iii) 1 & Dyksjks & 4 & ,fFkylkbDyksgDs lsu Write the structure of following organic compounds - (iv) 2 – Chloro -3 – Methyl pentane (v) 1,4 – dibromobut – 2 ene (vi) 1 – Chloro – 4 – Ethyl cyclohexane 16- fuEufyf[kr ifjorZu dSls djsx a s \ fyf[k,A 3 vad (i) csUthu ls ,suhyhu (ii) cst a kekbM ls ,suhyhu How will you convert ? (i) Benzene to Aniline (ii) Benzamide to Aniline vFkok or fuEufyf[kr ifjorZu dSls djsx a s \ fyf[k,A (i) FkSyhekbM ls N- ,fYdy FkSyhekbM (ii) csfUty DyksjkbM ls N, N- MkbesfFkuQsfuy esFksusehu How will you convert ? (i) phthalimide to - N – alkyl phthalimide (ii) Benzyl chloride to N, N dimethylphenyl methenamine. 17- (i) DoFkukad esa mUu;u dks ifjHkkf"kr dhft;s o bldk eksyyrk ls laca/k LFkkfir dhft;sA 4 vad (iii) ,d lkWlisu ik= esa 36g Xywdkst dks 1 kg ty esa ?kksyk x;k 1.013 ckj nkc ij ;g ty fdl rki ij mcysxk \ ty ds fy;s Kb = 0.52 K kg mol-1 gSA 7  (i) Define the elevation in boiling point and establish a relation of it with molality. (ii) 36g of glucose, C6H12O6, is dissolved in 1 kg of water is a saucepan, At what temperature will water boil at 1.013 bar ? Kb for water is 0.52 K kg mol-1. vFkok or (i) dejs ds rki ij lksMkokVj dh cksry [kksyus ij cqycqys mRiUu gksrs gS] D;ksa \ (ii) ,d izksVhu dks 200 cm3 tyh; foy;u esa 1-26g izksVhu dks 300 K ij bl foy;u dk ijklj.k nkc 2.57 x 10 -3 ckj ik;k x;k izksVhu ds eksyj æO;eku dk ifjdyu dhft;sA (i) Fizz / Bubbles are produced on opening of a bottle of soda water at room temperature, Why ? (ii) 200 cm3 of an aqueous solution of a protein contains 1.26g of the protein. The osmotic pressure of such a solution at 300 K is found to be 2.57 x 10-3 bar. Calculate the molar mass of protein. 18- (i) ;fn ,d /kkfRod rkj esa 0-5 ,sfEi;j dh /kkjk 2 ?k.Vksa ds fy, çokfgr gksrh gS rks rkj esa ls fdrus bysDVªªku çokfgr gksaxsA 4 vad (ii) fuEufyf[kr vfHkfØ;k esa Cr2O72- vk;uksa ds ,d eksy ds vip;u ds fy, dwykWe esa fo|qr dh fdruh ek=k dh vko';drk gksxh & Cr2O72- + 14H+ + 6e- 2cr3+ + 7H20 (i) If a current of 0.5 ampere flows through a metallic wire for 2 hours, than how many electrons would flow through the wire ? (ii) Considers the reaction Cr2O72- + 14H+ + 6e- 2cr3+ + 7H20. What is the quantity of electricity in coulombs needed to reduced 1 mol of Cr2O72- vFkok or 0.025 mol L-1 esFksuksbd vEy dh pkydrk 46.1 S cm2 mol-1 gSA bldh fo;kstu ek=k ,oa fo;kstu fLFkjkad dk ifjdyu dhft;sA fn;k x;k gS fd [H+] = 349.6 S cm2 mol-1 ,oa [HCOO-] =54.6 S cm2 mol-1 The conductivity of 0.025 mol L-1 Methanolic acid in 46.1 S cm2 mol-1. Find out the Rate of dissociation and dissociation constant. 8 19- Qhuksy vEyh; çd`fr çnf'kZr djrk gS D;ksa fyf[k,A 4 vad Phenol shows acidic nature, why ? vFkok fuEufyf[kr jklk;fud vfHkfØ;kvksa dks iw.kZ dhft;sA (i) N=N-Cl H2O Cux2 (ii) SO3H (i) NaOH (ii) H+ (iii) Cl + NaOH 623K 300 atm (iv) RCOOH LiA lH4 H2O Complete the following chemical reactions. fuEufyf[kr jklk;fud vfHkfØ;kvksa dks iw.kZ dhft;sA (i) N=N-Cl H2O Cux2 (ii) SO3H (i) NaOH (ii) H+ 9 (iii) Cl + NaOH 623K 300 atm (iv) RCOOH LiA lH4 H2O 20- D;k gksrk gS tc 4 vad (i) 2HCHO + NaOH (ii) COOH lkaæ HNO3 ruq HNO3 (iii) COOH Br2 / Fe (iv) R-COONa NaOH + CaO What happens when – (i) 2HCHO + NaOH (ii) COOH lkaæ HNO3 ruq HNO3 (iii) COOH Br2 / Fe (iv) R-COONa NaOH + CaO 10  vFkok çR;sd ;qXe ls dkSu lk vEy izcy gksxkA (i) CH3CO2H or CH2FCO2H (ii) CH2FCO2H or CH2ClO2H (iii) CH2FCH2CH2CO2H or CH3CHFCH2CO2H. (iv) F3C or H3C COOH COOH Which of the acid is stronger in each pair. (i) CH3CO2H or CH2FCO2H (ii) CH2FCO2H or CH2ClO2H (iii) CH2FCH2CH2CO2H or CH3CHFCH2CO2H. (iv) F3C or H3C COOH COOH ==============X============= 11