Which of the following is a single replacement reaction?

2Al + 6H2O 2Al(OH)3 + 3H2

CH4 + 2O2 CO2 + 2H2O

Fe2O3 + 3H2O 2Fe(OH)3

AgNO3 + NaCl AgCl + NaNO3

Question

Which of the following is a single replacement reaction? 

 2Al + 6H2O  2Al(OH)3 + 3H2 

 CH4 + 2O2  CO2 + 2H2O 

 Fe2O3 + 3H2O  2Fe(OH)3 

 AgNO3 + NaCl  AgCl + NaNO3

anonymous · Answer

i think it is:
 2Al + 6H2O 2Al(OH)3 + 3H2

anonymous · Answer

I would agree with Kryten.  

If you look at each of your reactions~ the first is the only reaction where ONLY ONE element (Hydroxide I believe) is switching places (which is the definiton of a single replacement). 

The second reaction looks like a double replacement, the third looks like a combination (synthesis) and the last looks to be a double replacement also.