The following are two reaction-schemes involving magnesium. find Compounds A to J based on the observations given are
A
A: MgO
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B
D: CO2
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C
F: CaCO3
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D
J: NO2
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E
all of these correct
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Solution
The correct option is E all of these correct The compound A is MgO The compound B:isMgCl2. The compound C is MgCO3 The compound D is CO2 The compound E is MgO The compound F is CaCO3 The compound G is MgSO4 The compound His Mg(OH)2 The compound I is Mg(NO3)2 The compound J is NO2 Mg reacts with oxygen to form MgO 2Mg+O2→2MgO MgO reacts with dilHCl to form MgCl2 MgO+2HCl→MgCl2+H2O MgCl2 reacts with sodium carbonate to form white precipitate of magnesium carbonate. MgCl2+Na2CO3→2NaCl+MgCO3↓(white). Magnesium carbonate on heating gives carbon dioxide gas. MgCO3hat−−→MgO+CO2↑. Carbon dioxide gas reacts with calcium hydroxide to form white ppt of calcium carbonate. Ca(OH)2+CO2→CaCO3+H2O Mg reacts with dil sulphuric acid to form colourless magnesium sulkphate. mg+H2So4→MgSO4+H2 Magnesium sulphate reacts with naOH to form white ppt of magnesium hydroxide. MgSO4+2NaOH→Na2SO4+Mg(OH)2 magnesium hydroxide reacts with nitric acid t form magnesium nitrate. Mg(OH)2+2HNO3→Mg(NO3)2+2H2O. The solution of magnesium nitrate on evaporation gives solid magnesium nitrate which on heating decomposes to form MgO and nitrogen dioxide gas. Mg(NO3)2heat−−→MgO+2NO2