Compound X and aluminium are used to join railway tracks. (a)Identify the compound X (b) Name the reaction (c) Write down itsreaction

Compound X and aluminium are used to join railway tracks. ¼i½ Identify the compound X. ¼ii½ Name the reaction. ¼iii½ Write down its reaction. 5- fod`r xfa /krk dks le>kb, \ [2] Explain Rancidity? 6- pkj çdk;kZRed lewgk sa ds uke crkb,& [2] Name the for functional groups – 7- esFk su‚y dh FkksM+h lh ek=k dk lsou Hkh ?kkrd gks ldrk gS A fVIi.kh fyf[k, A [2] Intake of a small quantity of methanol can be lethal. Comment. 8- ikS/ks ds 'kjhj esa iks"k.k dSls gksrk gS \ [2] How does the nutrition take place in the plant body ? 9- lkekU; o`f) vkSj y Safxd ifjiDork ,d nwljs ls fdl çdkj fHkUu gSa\ [2] How are general growth and sexual maturation different from each other? BSER Model Paper 10- eknk tuura= dk ukekafdr fp= cukb, A [2] Make a labelled diagram of the female reproductive system. 11- tc çdk'k dh fdj.ks a frjNh vkiru ds lkFk ços'k djrh gSa rks mudk ekx Z n'kkZrs gq, ,d fdj.k vkjs[k cukb,a A [2] gok ls ikuh esa Draw a ray diagram showing the path of rays of light when it enters with oblique incidence from air into water. 12- mÙky niZ.k }kjk cus çfrfcEcksa dh fLFkfr D;k gk srh gS \ [2] What are the positions of the images formed by the convex mirror? 13- p qacdh; {ks= js[kkvksa ds x q.k D;k gSa \ [2] What are the properties of Magnetic field lines? 14- y?kqiFku ls vki D;k le>rsgSa \ [2] What do you understand by Short Circuiting? 15- nSfud thou esa dksbZ pkj xfrfof/k;k¡ l q>k,¡ tks i;kZoj.k ds vu qdwy gksa A [2] Suggest any four activities in daily life which are eco-friendly. Section - C 16- D;k gksrk gS tc & [3] ¼i½ ftad /kkr q dks d‚ijlYQsV ?kksy e sa feyk;k tkrk gS \ ¼ii½ ruq lY¶;fw jd vEy esa ftad /kkrq feykbZ tkrh gS \ ;fn vfHkfØ;k gksrh gS rks l arqfyr jklk;fud lehdj.k Hkh fy[ksa A What happens when a piece of (i) Zinc metal is added to copper sulphate solution? (ii) Zinc metal is added to dilute Sulphuric acid? Also, write the balanced chemical equation if the reaction occurs BSER Model Paper fuEufyf[kr esa ls çR;sd dks ,d mnkgj.k nsdj le>kb,& [1ଵ ଶ + 1 ଵ ଶ ] ¼i½ la;kstu vfHkfØ;k ¼ii½ foLFkkiu vfHkfØ;k Explain the following by giving one example of each – ¼i½ Combination reaction ¼ii½ Displacement reaction 17- ikni g‚eksZu ls vki D;k le>rs gaS \ fdUgha nks ikni gkekZsu ds uke ,oa ,d&,d dk;Z fyf[k, A What do you understand by plant hormone? Write the names of any two plants hormones and one function each. [1+1+1] ekuo esa vxzefLr"d ds fofHkUu Hkkxksa ds uke ,oa dk;Z fyf[k, A [1+2] Write the name and functions of different parts of the forebrain in humans. 18- esaMy ds f}ladj ladj.k ds fu;e dks le>kb, A [3] Explain Mendel's law of dihybrid hybridization. esaMy }kjk çfrikfnr i`FkDdj.k ds fu;e dks le>kb, A [3] Explain the law of segregation propounded by Mendel. 19- ¼1½ LoPN vkdk'k dk jxa uhyk D;ksa fn[kkbZ nsrk gS \ [3] ¼2½ ge sa o"kkZ ds ckn gh vkdk'k esa baæ /kuq"k D;ksa fn[kkbZ nsrk gS \ (1) Why does the color of clear sky appear blue? (2) Why do we see rainbow in the sky only after rain? ¼1½ fVaMy çHkk

Compound X, A, B & C respectively are :CH3COONa, Na2ZnO2, NaOH, NaClNaOH, Na2ZnO2, NaCl, CH3COONaNa2ZnO2, CH3COONa, NaCl, NaOHNaOH, NaCl, Na2ZnO2, CH3COONa

Q9: A chemical compound 'X' is used in the soap and glass industry. It is prepared from brine.(a) Write the chemical name, common name and chemical formula of 'X'.(b) Write the equation involved in its preparation.(c) What happens when it is treated with water containing Ca or Mg salts?      [2020]

Below is the name of a compound that is made when aluminium and iodine react.aluminium iodideGive the name of the negatively charged ion present in this compound.

A solution of a substance ‘X’ is used for white washing.(i) Name the substance ‘X’ and write its formula.(ii) Write the reaction of the substance ‘X’ named in (i) above withwater