40 Which of the following is a redox reaction ? A . NaCl+ KNO3=NaNo3+HCl B. CaC2O4+2HCl=CaCl2+H2C2O4 C. Mg(OH)2+2NH4Cl=MgCl2+2NH4OH D. Zn+2AgCN=2Ag+Zn(CN)2

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A g N O_{3} + N a B r \to N a N O_{3} + A g B r

B a C l_{2} + H_{2} S O_{4} \to B a S O_{4} + 2 H C l

A g N O_{3} + N a C l \to A g C l + N a N O_{3}

N a O H + H C l \to N a C l + H_{2} O

C a C O_{3} + H C l \to C a C l_{2} + H_{2} O + C O_{2}

M n O_{2} + H C l \to M n C l_{2} + H_{2} O + C l_{2}

M g (O H)_{2} + H C l \to M g C l_{2} + H_{2} O

K I + H_{2} S O_{4} \to K H S O_{4} + I_{2} + S O_{2}

What is the principle of the following reaction?

$C a (O H)_{2} + M g C l_{2} \to M g (O H)_{2} + C a C l_{2}$

H C l

C a C l_{2}, M g C l_{2}

N a C l

When Ba(OH)₂ is added to NH₄Cl then which of the following reactions is correct regarding the products formed:

Ba(OH)₂ + 2NH₄Cl ---------> BaCl₂ + 2NH₃+ 2H₂O

Ba(OH)₂+ 2NH₄Cl ----------> BaCl₂ + 2NH₄OH

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