Al oestions are worth S points Whidh of the following reactioes is a single repl

Question

Al oestions are worth S points Whidh of the following reactioes is a single replacement reaction? A) s HCl + NaOH NaCl + H2O 17, which of the following reactions is a double replacement reaction? C) CaCl2 + H2OCaa2 . 2H20 1s. Which of the following reactions is a decomposition reaction? B)Mg + HCl H2 + MgCl2 C) CaCl2 +H2OCaC2·2H2O 19. Which of the following equations is a combustion reaction? B)Al+Fe2O3 Al2O3 + Fe D)CH4 + 02 CO2 + H2O 20. The equation AgNO3 + NaCl AgC1+ NaN03 isanexample of a reaction. B) precipitation D) decomposition A) combination C) single replacement The spectator ions in the precipitation equation AgNO3 + NaCI Agcl + NaNOs are A) Agt and NO3 21. B) Nat and NO3 D) Nat and Ch C) Agt and Ch 22. The net jonic equation for the reaction AgNO+NaCI> AgCI+ NaNOs is A) Ag+ (aq) +NO3" (aq)AgNO3 C) Na+ (aq) + NO3.(aq)NaNO3 B) Ag+ (aq) + Cr (aq) AgCl (s) D) NaCI+ AgNO3 AgCI (s) 23. What is the coeffisient for iron is after the following reaction is balanced: Fe(s) +02 (g) Fe2O3 (s)?

Explanation / Answer

16. B, as Mg displace hydrogen

17. A , exachange of ions between two reactants

18. D, one substance KClO3 break down to form two.product

19. D , methane CH4 react with oxygen to release energy

20. B, white.ppt og AgCl is formed

21. B , Na+ and NO3 - as they remains same with no change in valancy.

22.C, refer answer 21

23. Answer is 4 , 4Fe + 3O2 ---> 2Fe2O3

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