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(D) The manufacturing process of $K_{2}Cr_{2}O_{7}$ from chromite ore $(FeCr_{2}O_{4})$ involves three main steps:$1$. Conversion of chromite ore into

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$Sodium \ chromate$

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(D) The manufacturing process of $K_{2}Cr_{2}O_{7}$ from chromite ore $(FeCr_{2}O_{4})$ involves three main steps:$1$. Conversion of chromite ore into sodium chromate:$4FeCr_{2}O_{4} + 8Na_{2}CO_{3} + 7O_{2} \longrightarrow 2Fe_{2}O_{3} + 8CO_{2} + 8Na_{2}CrO_{4}$$2$. Conversion of sodium chromate into sodium dichromate:$2Na_{2}CrO_{4} + H_{2}SO_{4} \longrightarrow Na_{2}Cr_{2}O_{7} + Na_{2}SO_{4} + H_{2}O$$3$. Conversion of sodium dichromate to potassium dichromate:$Na_{2}Cr_{2}O_{7} + 2KCl \longrightarrow K_{2}Cr_{2}O_{7} + 2NaCl$In the first step,$Na_{2}CrO_{4}$ (sodium chromate) is produced. This $Na_{2}CrO_{4}$ is then used as a reactant in the second step to produce $Na_{2}Cr_{2}O_{7}$.

Column $A$	Column $B$
$(1)$ Brass	$(a)$ $Ni$ $(60\%)$,$Cr$ $(40\%)$
$(2)$ Bronze	$(b)$ $Cu$ $(80\%)$,$Sn$ $(20\%)$
$(3)$ Cupronickel	$(c)$ $Cu$ $(90\%)$,$Sn$ $(10\%)$
$(4)$ Nichrome	$(d)$ $Cu$ $(70\%)$,$Zn$ $(30\%)$
	$(e)$ $Cu$ $(75-85\%)$,$Ni$ $(15-25\%)$

Which of the following is a product of the first step and is used as a reactant in the next step for the manufacture of $K_{2}Cr_{2}O_{7}$ from concentrated chromite ore?

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Complete the following reactions:
$(a)$ $4FeCr_2O_4 + 8Na_2CO_3 + 7O_2 \to 8Na_2CrO_4 + 2Fe_2O_3 + 8CO_2$
$(b)$ $2Na_2CrO_4 + 2H^+ \to Na_2Cr_2O_7 + 2Na^+ + H_2O$
Identify the species $X$ in both reactions.

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Match Column $A$ with Column $B$:

Column $A$ Column $B$

$(1)$ Brass $(a)$ $Ni$ $(60\%)$,$Cr$ $(40\%)$

$(2)$ Bronze $(b)$ $Cu$ $(80\%)$,$Sn$ $(20\%)$

$(3)$ Cupronickel $(c)$ $Cu$ $(90\%)$,$Sn$ $(10\%)$

$(4)$ Nichrome $(d)$ $Cu$ $(70\%)$,$Zn$ $(30\%)$

$(e)$ $Cu$ $(75-85\%)$,$Ni$ $(15-25\%)$

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