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Term I Exam, Revision Test Paper 1, Class XII, Subject: Chemistry, Time 1.5 hr, Multiple Choice Questions, Dated: 30.11.2021, MM 35, 1. Mole fraction of glycerine C3H5(OH)3 in solution containing 36 g of water and 46 g of glycerine is, (a) 0.46, (b) 0.40, (c) 0.20, (d) 0.36, 2. An unripe mango placed in a concentrated salt solution to prepare pickle, shrivels because-, , (a) It gains water due to osmosis., (b) It gains water due to reverse osmosis., , (b) It loses water due to reverse osmosis., (d) It loses water due to osmosis., , 3. Two beakers of capacity 500 mL were taken. One of these beakers, labeled as “A”, was filled with 400 mL water whereas the, beaker labeled “B” was filled with 400 mL of 2 M Solution of NaCl. At the same temperature both the beakers were placed in, closed containers of same material and same capacity as shown in figure given below :-, , At a given temperature which of the following statement is correct about the vapour pressure of pure water and that of NaCl, solution., , (a), (b), (c), (d), , Vapour pressure in container (A) is more than that in container (B)., Vapour pressure in container (A) is less than that in container (B)., Vapour pressure is equal in both the containers., Vapour pressure in container (B) is twice the vapour pressure in container (A)., , 4. When 0.6 g of Urea dissolved in 100 g water, the water will boil at (Kb for water =0.52 K m-1 and normal boiling point of, water= 100oC)., , (a), (b), (c), (d), , 372.48 K, 273.52 K, 373.052 K, 273.052 K, , 5. The cell constant of a conductivity cell _____, , (a), (b), (c), (d), , Changes with change of electrolyte., Changes with change of concentration of electrolyte., Changes with temperature of electrolyte., , Remains constant for a cell., 6. The emf of the cell: Ni / Ni2+ (1.0 M) // Au3+ (1.0 M) / Au (E° = -0.25 V for Ni2+/Ni; E° = 1.5 V for Au3+/Au) is, (a) 1.25 V, (b) -1.25 V, (c) 1.75 V, (d) 2.0 V, 7. Standard solution of KNO3 is used to make a salt bridge because, (a) Velocity of K+ is greater than that of NO3−., (b) Velocity of NO3− is greater than that of K+., (c) Velocity of both K+ and NO3− are nearly same., (d) KNO3 is highly soluble in water., 8. The limiting molar conductivities, , ᴧo for NaCl, KBr and KCI are 126, 152 and 150 S cm2 mol-1 respectively. The ᴧo for NaBr is, , (a) 278 S cm2 mol-1, (b) 128 S cm2 mol-1, (c) 428 S cm2 mol-1, (d) 302 S cm2 mol-1, 9. Which among the following is a false statement?, (a) Rate of zero order reaction is independent of initial concentration of reactant., (b) Units of rate constant for second order reaction are L mol-1 s-1., (c) Molecularity of a reaction may be zero or fraction., (d) For a first order reaction, t1/2=0.693/K, 10. An endothermic reaction with high activation energy for the forward reaction is given by the diagram.

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(a), , (b), , (c), , (d), , 11. The rate of a certain hypothetical reaction A + B + C → products is given byRate = K[A]1/2[B]1/3[C]1/4. The order of the reaction is, (a) 13/11, (b) 13/14, (c) 12/13, (d) 13/12, 12. Milk turns sour at 40oC three times faster than it does at 0oC. This shows that activation energy of souring of milk is, (a) 2.303 x R x 273 x 313 log3, , 40, (b) 2.303 x R x 273 x 313 log 1/3, , 40, (c) 2.303 x R x 40 log3, 273x313, (d) ) 2.303 x 273 x 313 log3, , 40, 13. 75% of the first order reaction was completed in 32 min. 50% of the reaction was completed in, (a) 24 min, (b)8 min, (c) 16 min, (d) 4 min, 14. When a small amount of FeCl3 is added to a freshly precipitated Fe(OH) 3, a reddish brown colloidal solution is obtained., This phenomenon is known as, (a) Dialysis, (b) Peptization, (c) Protection, (d) Desorption, 15. Cottrell precipitator is used to, (a) Precipitate mud from muddy water., (b) Precipitate carbon particles from smoke., (c) Purify the ordinary drinking water., (d) Precipitate salts in qualitative analysis., 16. A colloidal system is which liquid is dispersed phase and solid is dispersion medium is classified as, (a) Gel, (b) Sol, (c) Emulsion, (d) Aerosol, 17. The formation of micelles takes place only above, (a) Critical temperature, (b) Kraft temperature, (c) Inversion temperature, (d) Absolute temperature, 18. The method of zone refining of metals is based on the principle of, (a) Greater mobility of the pure metal than that of the impurity., (b) Higher melting point of the impurity than that of the pure metal., (c) Greater noble character of the solid metal than that of impurity., (d) Greater solubility of the impurity in the molten state than in the solid., 19. From the Ellingham graph between Gibb’s energy and temperature, out of C and CO which is a better, reducing agent for ZnO?, (a) Carbon, (b) CO, (c) Both of these, (d) None of these, 20. Nitrogen is relatively inert molecule because(a) Its atom has a stable electronic configuration., (b) It has low atomic radius.

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(c) Its electronegativity is fairly high., (d) Dissociation energy of its molecule is fairly high., 21. Which one of the following is the strongest Lewis base?, (a) NH3, (b) PH3 (c) AsH3 (d) SbH3, 22. The correct order of acid strength is(a) HClO4 < HClO3 < HClO2 < HClO, (b) HClO2 < HClO3 < HClO4 < HClO, (c) HClO4 < HClO < HClO3 < HClO2, (d) HClO < HClO2 < HClO3 < HClO4, 23. The boiling points of hydrides of group 16 are in the order(a) H2O > H2Te > H2S > H2Se, (b) H2O > H2S > H2Se > H2Te, (c) H2O > H2Te > H2Se > H2S, (d) None of these, 24. The formation of O2+ [PtF6]– is the basis for the formation of first Xenon compound. This is because(a) O2 and Xe have different sizes., (b) Both O2 and Xe are gases., (c) O2 and Xe have comparable Electro-negativities. (d) O2 and Xe have comparable Ionisation Enthalpies., 25. Oleum is a mixture of(a) H2SO4 +SO2, (b) H2SO4 +SO3, (c) H2S2O3 +SO3, (d) H2S2O3 +SO2, 26. The element which can displace three other halogens from their compound is(a) F, (b) Cl, (c) Br, (d) I, 27. Which of the following compound is not coloured?, , (a) Copper (II) Sulphate, (b) Zinc (II) Chloride, (c) Chromium (III) Sulphate, (d) Manganese (II) Oxallate, 28. The maximum magnetic moment shown by the ion with electronic configuration of, (a) 3d8, (b) 3d5, (c) 3d7, (d) 3d9, 29. for the reaction CrO4-2 + ? → Cr2O7-2, the missing ion is(a) OH(b) H+, (c) H2O, (d) O-2, 30. The properties of Zr and Hf are similar because(a) Both belong to d-block., (b) Both belong to same group of periodic table., (b) Both have similar radii., (d) Both have same number of electrons., 31. Interstitial compounds are formed when small atoms are trapped inside the crystal lattice of metals. Which, of the following is not the characteristic property of interstitial compounds?, (a) They have high melting points in comparison to pure metals., (b) They are very hard, (c) They retain metallic conductivity, (d) They are chemically very reactive., 32. When acidified K2Cr2O7 solution is added to Sn2+ salts then Sn2+ changes to(a) Sn, (b) Sn3+, (c) Sn4+, (d) Sn+, 33. Why is HCl not used to make the medium acidic in oxidation reactions of KMnO4 in acidic medium?, (a) Both HCl and KMnO4 act as oxidizing agents., (b) KMnO4 oxidises HCl into Cl2 which is also an oxidizing agent., (b) KMnO4 is a weaker oxidizing agent than HCl., (d) KMnO4 acts as a reducing agent in the presence of HCl., 34. IUPAC name of [Pt(NH3)3 Br (NO2) Cl] Cl is, (a) triamminechlorodibromidoplatinum (IV) chloride, (b) triamminechloridobromidonitrochloride- platinum (IV) chloride, (c) triamminebromidochloridonitroplatinum (IV) chloride, (d) triamminenitrochlorobromoplatinum (IV) chloride, 35. The stabilization of coordination compounds due to chelation is called the chelate effect. Which of the following is the most, stable complex species?, (a) [Fe(CO)] (b) [Fe(CN)6]3(c) [Fe(C2O4)3]3(d) [Fe(H2O)6]3+, , BY HEAD OFFICE, PPPP SCIENCE SEN SEC STATE TEAM