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Chemistry-1997
IIT-JEE-Chemistry–1997
Time : Three Hours Max. Marks : 100
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Instructions:
1. Answer all questions in the language of your choice as shown in your admit card. 2. The paper consists of eight printed pages 10 questions. 3. Answer to next question should start after drawing a separating horizontal line with a in the question paper. 4. All sub-questions of a question should be answered at one place in the same order as in the question paper. 5. There is no negative marking. 6. Use of all type of calculating devices, graph paper, trigonometric/statistical tables is prohibited. 7. Use of Lagarithmic Tables is permitted. Useful Data: Avogadro constant, NA = 6.02 × 1023 mol–1 Faraday constant, F = 96500 C mol–1 Gas constant, R = 8.314 JK–1 mol–1 or R = 0.082 dm–3 atm K–1 mol–1 Relative atomic masses: H = 1.0; O = 16.0 Cl = 35.5; Cr = 51.99; Ag = 107.8 Atomic numbers Na = 11; Mg = 12 V = 23; Cu = 29; Ag = 47 _____________________________________________________________________
1. There are fifteen sub-questions in this question. For answering each sub-question, four alternatives are given, and only one of them is correct. Indicate your answer for each sub-question by writing one of the letters A, B, C or D only in the answerbook.
(i) For a d-electron, the orbital angular momentum is :
(A) √6 (h/2π) (B) √2 (h/2π)
(C) (h/2π) (D) 2 (h/2π)
(ii) The standard reduction potentials of Cu2+|Cu and Cu2+|Cu+ are 0.337 V and 0.153 V respectively. The standard electrode potential of Cu+|Cu half cell is:
(A) 0.184 V (B) 0.827 V
(C) 0.521 V (D) 0.490 V
(iii) The compressibility factor for an ideal gas is :
(A) 1.5 (B) 1.0
(C) 2.0 (D) ¥
(iv) Which contains both polar and non-polar bonds :
(A) NH4Cl (B) HCN
(C) H2O2 (D) CH4
(v) The critical temperature of water is higher than that of O2 because the H2O molecule has :
(A) fewer electrons than O2 (B) two covalent bonds
(C) V-shape (D) dipole moment.
(vi) Which one of the following species is not a pseudohalide:
(A) CNO– (B) RCOO–
(C) OCN– (D) NNN–
(vii) Ammonium dichromate is used in some fireworks. The green coloured powder blown in the air is :
(A) CrO3 (B) Cr2O3
(C) Cr (D) CrO (O2).
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