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SMT. SULOCHANADEVI SINGHANIA SCHOOL, THANE STD X SUB CHEMISTRY EXAM PRELIM II MARKS 80 TIME 2 Hrs Section I Attempt all questions from this section Question 1 A. Select the correct answers from the choices given: [5] i) German silver is an alloy of a) Cu + Zn b) Cu + Sn c) Cu + Zn + Ni d) Cu + Zn + Sn ii) A compound having one lone pair electron is a) Water b) Methane c) Ammonia d) Hydrogen sulphide iii) Sal ammoniac has the formula a) (NH4)2SO4 b) (NH4)2CO3 c) NH4Cl d) NH4OH iv) A nitrate which on heating decrepitates and produces yellow residue which fuses with the sides of the test-tube. a) Lead nitrate b) Silver nitrate c) Zinc nitrate d) Mercuric nitrate v) A reagent used to distinguish between alkanes and alkynes is a) Bromine water b) Carbon tetrachloride c) Zinc nitrate d) Mercuric nitrate B. Name the gas evolved in each case: i) ii) iii) iv) v) [5] The gas produced by the action of concentrated sulphuric acid on potassium nitrate. The gas produced by action of very dilute nitric acid on manganese. The gas produced on heating potassium nitrate. The gas evolved when conc .hydrochloric acid is oxidized by potassium dichromate. The gas that burns in oxygen with a green flame. C. State relevant observations in each of the following cases: i) A rod dipped in Ammonium hydroxide is brought near jar of HCl gas. ii) A few drops of conc sulphuric acid is added to blue vitriol. [5]
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