Download.pdf

1. The correct statement is (2) Sodium cyanide cannot be used in the metallurgy of silver.
2. The correct statements among (a) to (d) are (a), (b), (c) and (d).
3. The factor that does not govern the stability of a conformation in acyclic compounds is (4) Electrostatic forces of interaction.
4. The noble gas that does NOT occur in the atmosphere is (2) Ra, but it should be Rn.
5. The highest possible oxidation states of uranium and plutonium, respectively, are (3) 6 and 7.
6. The difference between ΔH and ΔU (ΔH–ΔU) is (4) –4RT.
7. The INCORRECT statement is (4) The gemstone, ruby, has Cr3+ ions occupying the octahedral sites of beryl, as the chemical formula of ruby is Al2O3.
8. The crystal field stabilization energy (CFSE) of [Fe(H2O)6]Cl2 and K2[NiCl4], respectively, are (1) –0.4Δ0 and –0.8Δt.
9. The activation energy for the reaction is (4) 166 kJ mol–1.
10. The number of stereo centres present in linear and cyclic structures of glucose are respectively (4) 4 & 5.
11. The number of pentagons in C60 and trigons (triangles) in white phosphorus, respectively, are (4) 12 and 4.
12. The correct option among the following is (4) Colloidal particles in lyophoboic sols can be precipitated by electrophoresis.
13. The ratio of the elevation in their boiling points is (2) 1 : 5.
14. The correct order of the first ionization enthalpies is (2) Ti < Mn < Ni < Zn.
15. The pH of a 0.02 M NH4Cl solution will be (4) 5.35.
16. The INCORRECT statement is (1) Higher Rf value means higher adsorption.
17. The method that is NOT a correct method of preparation of benzylamine from cyanobenzene is (1) (i) HCl/H2O (ii) NaBH4.
18. The increasing order of nucleophilicity of the given nucleophiles is (4) (b) < (c) < (a) < (d).
19. The correct graph between molar conductivity (Λm) versus C is (1).
20. The major product obtained in the given reaction is (2).