When a mineral was heated in a Bunsen flame to constant mass, a colourless gas that turned lime water milky was evolved. The remaining solid was cooled and then added to aqueous hydrochloric acid. Vigorous effervescence was seen.

What was the mineral?

A aragonite, CaCO3

B artinite, MgCO3.Mg(OH)2.3H2O

C barytocalcite, BaCO3.CaCO3

D dolomite, CaCO3.MgCO3

Question

When a mineral was heated in a Bunsen flame to constant mass, a colourless gas that turned lime water milky was evolved. The remaining solid was cooled and then added to aqueous hydrochloric acid. Vigorous effervescence was seen.

What was the mineral?

 

A aragonite, CaCO3

B artinite, MgCO3.Mg(OH)2.3H2O

C barytocalcite, BaCO3.CaCO3

D dolomite, CaCO3.MgCO3

anonymous · Answer

C.

calculator · Answer

how u know?

anonymous · Answer

vigorous effervescnce cn be seen only in C

calculator · Answer

why? you mean you have to memorise it ? there's no reason behind it?

anonymous · Answer

the answer is pretty easy, all you have to do is study periodic table of elements! Ba is very big atom so he attracts electrons in outer shell with much less effect than those elements over him (look at electronegativity) so reactivity grows as you go down in periodic table and i employ you to see a demonstration by entering in google "alkali metals brainiacs" where that reactivity is demonstrated...