Which of the following equations is not a double replacement ...

[charchew]

Which of the following equations is not a double replacement reaction?
 
  A) H2SO4 + Mg(OH)2  H2O + MgSO4
  B) Mg + HCl  H2 + MgCl2
  C) AlCl3 + H2O  Al(OH)3 + HCl
  D) AgNO3 + NaCl  AgCl + NaNO3

Question 2

Chalk is primarily composed of calcium carbonate. The formula of calcium carbonate is
 
  A) CaCO3.
  B) Ca2CO3.
  C) Ca(CO3)2.
  D) Ca3(CO3)2.

[epscape]

Answer to Question 1

B

Answer to Question 2

A

[charchew]

Wow, this really help

[kjohnson]

Thanks for the timely response, appreciate it