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11. When a clear aluminium article is made the anode and is electrolyzed with dil sulphuric acid to make a thicker protective and attractive oxide layer around it, then the process is called (NTSE Delhi, Stage-I, 2015-16)
Galvanisation
Anodising
Leaching
Thermite process
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12. A white coloured compound 'XY' is used in photochromic lenses. Choose the incorrect statement from the following (NTSE Delhi, Stage-I, 2015-16)
The compound 'XY' decomposes into a metal and a non-metal on exposure to sunlight
The compound 'XY' is completely soluble in aq. ammonia solution
The metal part of 'XY' is grey coloured in elemental form
The non-metal part of 'XY' is violet coloured in elemental form
13. Galena is an ore of (NTSE Telangana, Stage-I, 2015-16)
Zn
Au
Pb
AI
14. The purpose of smelting an ore is to __ (NTSE Telangana, Stage-I, 2015-16)
Oxidize
Reduce
Neutralize
Decompose
15. In which of the following solutions will platinum dissovle? (NTSE Tamil Nadu, Stage-I, 2015-16)
Conc HN03 and Conc HCI in the ratio 3 : 1
Conc H2S04 and Conc HN03 in the ratio 3:4
Conc HCI and Conc H2S04 in the ratio 1 : 3
Conc HCI and Conc HN03 in the ratio 3 : 1
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