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(B) $(1)$ $Ca_3P_2 + 6H_2O \rightarrow 3Ca(OH)_2 + 2PH_3$ (Forms $PH_3$)$(2)$ $4H_3PO_3 \xrightarrow{\Delta} 3H_3PO_4 + PH_3$ (Forms $PH_3$)$(3)$ $P_4

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$3$

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(B) $(1)$ $Ca_3P_2 + 6H_2O \rightarrow 3Ca(OH)_2 + 2PH_3$ (Forms $PH_3$)$(2)$ $4H_3PO_3 \xrightarrow{\Delta} 3H_3PO_4 + PH_3$ (Forms $PH_3$)$(3)$ $P_4 + 3NaOH + 3H_2O \rightarrow 3NaH_2PO_2 + PH_3$ (Forms $PH_3$)$(4)$ $H_3PO_4 \xrightarrow{\Delta} HPO_3 + H_2O$ (Does not form $PH_3$)$(5)$ $4HNO_3 + P_4O_{10} \rightarrow 4HPO_3 + 2N_2O_5$ (Does not form $PH_3$)$(6)$ $P_4 + 20HNO_3 \rightarrow 4H_3PO_4 + 20NO_2 + 4H_2O$ (Does not form $PH_3$)Thus,reactions $(1)$,$(2)$,and $(3)$ produce $PH_3$ gas. The total count is $3$.

How many of the following reactions will form $PH_3$ gas?
$(1)$ $Ca_3P_2 + H_2O \to$
$(2)$ $H_3PO_3 \xrightarrow{\Delta} $
$(3)$ $P_4 + NaOH \to$
$(4)$ $H_3PO_4 \xrightarrow{\Delta} $
$(5)$ $HNO_3 + P_4O_{10} \to$
$(6)$ $P_4 + HNO_3 \to$

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How many of the following reactions will form $PH_3$ gas?$(1)$ $Ca_3P_2 + H_2O \to$$(2)$ $H_3PO_3 \xrightarrow{\Delta} $$(3)$ $P_4 + NaOH \to$$(4)$ $H_3PO_4 \xrightarrow{\Delta} $$(5)$ $HNO_3 + P_4O_{10} \to$$(6)$ $P_4 + HNO_3 \to$