Tiêu đề 06. GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS - 01.pdf ✅

2 11. Which of the following ore of the metal(s) is / are concentrated by leaching method (A) Al (B) Fe (C) Au (D) Ag 12. Which of the following is/are correct statement(s)? (A) Calamine is the ore of zinc (B) Pyrolusite is the ore of manganese (C) Cassiterite is the ore of tin (D) Calcite is the ore of calcium 13. For which of the following metals can be extracted by aluminothermite process? (A) Mn (B) Fe (C) Cr (D) Mg 14. Match List – I with List – II List - I List - II (A) Sphalerite (I) FeCO3 (B) Calamine (II) PbS (C) Galena (III) ZnCO3 (D) Siderite (IV) ZnS Choose the most appropriate answer from the options given below: (A) (A) – (IV), (B) – (III), (C) – (II), (D) – (I) (B) (A) – (IV), (B) – (I), (C) – (II), (D) – (III) (C) (A) – (II), (B) – (III), (C) – (I), (D) – (IV) (D) (A) – (III), (B) – (IV), (C) – (II), (D) – (I) 15. In extraction of metal how many of the following ores involve calcination process. (a) Dolomite (b) Malachite (c) Calcite (d) Copperpyrites (e) Sylvine (f) Cryolite (g) Siderite (h) Iron pyrite (i) Argentite
3 ANSWER KEY 1. ( C ) 2. (D) 3. ( B ) 4. ( B ) 5 . ( B ) 6 . ( D ) 7 . ( C ) 8 . ( C ) 9 . ( C ) 10 . ( B ) 11 . ( A ) 12 . (ABCD ) 13 . (A, B, C ) 14 . ( A ) 15 . ( 4 )