A) ferrous sulphate
B) copper sulphate
C) sodium alumino silicate
D) zinc sulphate
Correct Answer: C
Solution :
Sl. Lapis lazuli is a blue coloured mineral used as precious stone. It is chemically sodium aluminium silicates \[3N{{a}_{2}}O.3A{{l}_{2}}{{(Si{{O}_{2}})}_{6}},2N{{a}_{2}}S\] Copper sulphate \[(CuS{{O}_{4}}.5{{H}_{2}}O)\] known as blue vitriol is used in electroplating, in textile dyeing as mordant as timber preservative and in Bordeaux mixture (a mixture of \[\text{CuS}{{\text{O}}_{\text{4}}}\]and lime) used as fungicide in agriculture. Zinc sulphate \[\text{(ZnS}{{\text{O}}_{4}}\text{.7}{{\text{H}}_{2}}\text{O)}\] known as white vitriol is used in galvanisation and as mordant in dyeing.
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