6. Accordi ng to the solubility rules, which of the following compounds is insol

Question

6. Accordi ng to the solubility rules, which of the following compounds is insoluble in water? a. Caco, b. (NH),cO, c. Na,co, d. K,CO, when 7. According to the solubility rules, which of the following is true CuSo, is mixed with BaCI2 in water? a. CuCl, will precipitate, and Ba and SO are spectator ions b. CuSO, will precipitate, and Ba2 and Cr are spectator ions and CI are spectator ions c. BaSO, will precipitate, and Cu d. BaCh will precipitate, and Cu and SO, are spectator ions e. No precipitate will form 8. The common constituent in all acid solutions is a. H2 b. H,SO, c. OH d. H e. Cl 9. When HCI reacts with Ca(OH), water and what other product forms? a. CaO b. CaC2 C. d. CaCl e.CaCIH 10. The oxidation number of N in NaNO, is a. +6 b. +5 c. +3 d.-3 e.-1 11. Which of the following is false? a. acids have a sour taste b. acids change blue litmus paper red c. acids react with some metals to produce hydrogen gas d. acids are a source of H' ions e. acids do not react with bases 12. What is the molarity of a solution that contains 5.0 moles of sodium chloride in 2.00 liters of solution? a. 1.0 M b. 2.5 M c. 5.0 M d. 7.5 M e. 9.0 M

Explanation / Answer

Q6)

CaCO3 is the insoluble salt .

All sodium , ammonium and most of the potassium salts are water soluble.

Q7)

CuSO4(aq) + BaCl2 (aq) -----------> BaSO4(s) + CuCl2(aq)

So BaSO4 is precipitated and Cu+2 and Cl- ions are spectator ions.

Option C

Q8) OPtion D

The common constituent in all Acids is H+ ion.

Q9) option b

HCl(aq ) + Ca(OH)2 (aq) ------------> CaCl2 (aq) + H2O(l)

Q10) OPtion b

NaNO3 the oxidation state of N is +5 (Na is +1 Na O is -2 , assuming N =x , 1+ x+ (3x-2) = 0 , thus N is +5)

Q11) option e

ACids react with bases to give salt and water. Others are all correct.

Q12) option b

Molarity = number of moles of solute / volume(L)

= 5/2 = 2.5

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