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Question

The following are two reaction-schemes involving magnesium. find Compounds A to J based on the observations given are



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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+O22MgO
MgO reacts with dilHCl to form MgCl2
MgO+2HClMgCl2+H2O
MgCl2 reacts with sodium carbonate to form white precipitate of magnesium carbonate.
MgCl2+Na2CO32NaCl+MgCO3(white).
Magnesium carbonate on heating gives carbon dioxide gas.
MgCO3hatMgO+CO2.
Carbon dioxide gas reacts with calcium hydroxide to form white ppt of calcium carbonate.
Ca(OH)2+CO2CaCO3+H2O
Mg reacts with dil sulphuric acid to form colourless magnesium sulkphate.
mg+H2So4MgSO4+H2
Magnesium sulphate reacts with naOH to form white ppt of magnesium hydroxide.
MgSO4+2NaOHNa2SO4+Mg(OH)2
magnesium hydroxide reacts with nitric acid t form magnesium nitrate.
Mg(OH)2+2HNO3Mg(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)2heatMgO+2NO2

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