Question 11. The cloride would be formed when the effects of chloral with Mn? a) b) c) MnCl5 MnCl4 MnCl2 d) MnCl6Question 12. Oxidation level + 6 featured for the following elements: 1) Chromium Molybdenum) 3) Tungsten a) 1 b) 1 & 2 c) 1 & 3 d) 2 & 3 Question 13. Oxide in oxide below the water soluble? a) b) c CrO3) solution Cr2O3 that MoO3 d) WO3 Verse 14. Oxide below is strongly oxidising? a) b) c) MoO3 CrO3 WO3 d) W2O5Question 15. The solution below when to dissociated CrCl3 create Cr (OH) 3? 1) Na2CO3) NH3 3) the 4 Na2SO4) (NH4) 2S a) 1 b) 1 & 2 c) 1 & 3 d) 1, 2 & 4Verse 16. The salts of chromium can complete hydrolysis in aqueous? a) Cr2S3 c b) CrCl3) Cr2 (SO4) 3 d) CrF3Verse 17. The compound would be made up when the furnace solution Cr2O3 that with K2S2O7? a) KCrO2 b) K2CrO4 c) d K2Cr2O7) Cr2 (SO4) 3Verse 18. The ion can exist in acid environment? 1) [Cr (H2O) 6] 3 + 2), [Cr (OH) 62-] 3) CrO42-4) Cr2O72- a) 1 & 3 b) 2 & 3 c) 1 & 4 d) 1, 3 & 4Question 19. Can use any compound to convert the Cr (VI) compounds into compounds of Cr (III)? K2Cr2O7 + FeSO4 + 2) H2SO4 (diluting) → 2) K2Cr2O7 + (NH4) 2S + H2O → 3) K2CrO4 + H2SO4 (đđ) → 4 + Na2CO3 + H2O → K2Cr2O7) a) 1 b) 3 & 4 c) 1 & 2 d) 2Question 20. The following substances are commonly used as substances in chemical reactions? 1) 2 CrO3) MoO3 3) 4 K2Cr2O7) K2WO4 a) 1 & 2 b) 1, 2, 3 & 4 c) 2 & 4 d) 1 & 3
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