### The correct formula for dinitrogen pentoxide is A NO5 B N2O4 C N2O5 D NO6 E N2O6

The correct formula for dinitrogen pentoxide is:

A) NO_{5} B) N_{2}O_{4} C) N_{2}O_{5} D) NO_{6} E) N_{2}O_{6}

82. The correct formula for tetraphosphorus hexoxide is:

A) PO_{6} B) P_{5}O_{6} C) P_{4}O_{7} D) P_{4}O_{6} E) P_{5}O_{7}

83. Which of the following formula/name combinations is **incorrect**?

A)HF(*aq*) hydrofluoric acidD)HClO_{4}(*aq*) perchloric acid

B)HNO_{3}(*aq*) nitrous acidE)H_{3}PO_{3}(*aq*) phosphorous acid

C)H_{2}SO_{4}(*aq*) sulfuric acid

84. Which of the following formula/name combinations is **incorrect**?

A)HNO_{2}(*aq*) nitrous acidD)HClO_{2}(*aq*) hypochlorous acid

B)HBr(*aq*) hydrobromic acidE)H_{3}PO_{4}(*aq*) phosphoric acid

C)H_{2}SO_{3}(*aq*) sulfurous acid

85. Which of the following formula/name combinations is **incorrect**?

A)HI(*aq*) hydroiodic acidD)H_{2}SO_{3}(*aq*) sulfurous acid

B)H_{2}S(*aq*) hydrosulfuric acidE)H_{3}PO_{3}(*aq*) phosphoric acid

C)HClO_{3}(*aq*) chloric acid

86. Which set of ions is formed when (NH_{4})_{2}SO_{4} dissolves in water?

A)(NH_{4})_{2}^{2+ }+ SO_{4}^{2}^{?}D)2 N^{3}^{?} + 8 H^{+} + S^{+6} + 4 O^{2}^{?}

B)2 NH_{3} + 2 H^{+} + SO_{4}^{2}^{?}E)2 N^{3}^{??}+ 8 H^{+ }+ SO_{4}^{2}^{?}

C)2 NH_{4}^{+} + SO_{4}^{2}^{?}

87. Which set of ions is formed when Ca(NO_{3})_{2} dissolves in water?

A)Ca^{2+} + (NO_{3})_{2}^{2}^{?}D)Ca^{2+} + 2 NO_{3}^{?}

B)Ca + (NO_{3})_{2}E)Ca^{2+} + 2 N^{3- }+ 6 O^{2}^{?}

C)Ca^{+} + 2 NO_{3}^{?}

88. Which set of ions is formed when Cu_{2}SO_{4} dissolves in water?

A)2 Cu^{2+} + SO_{4}^{2}^{?}D)2 Cu^{+} + S^{+6} + 4 O^{2}^{?}

B)Cu^{2+} + SO_{4}^{2}^{?}E)Cu_{2}^{2+} + 2 SO_{4}^{2}^{?}

C)2 Cu^{+} + SO_{4}^{2}^{?}

89. Which set of formulas is correct for the compounds calcium hydrogen carbonate, magnesium chloride, and calcium sulfate, which can cause scale build-up in pipes?

A)CaHCO_{3}, MgCl_{2}, and Ca(SO_{4})_{2}D)Ca(HCO_{3})_{2}, MgCl_{2}, and CaSO_{4}

B)CaHCO_{3}, MgCl, and Ca(SO_{4})_{2}E)Ca(HCO_{3})_{2}, MgCl_{2}, and Ca_{2}SO_{4}

C)Ca(HCO_{3})_{2}, MgCl, and CaSO_{4}

90. Which set of formulas is correct for the compounds ammonia, nitric acid, and nitrous acid, respectively?

A)NH_{3}, HN, HNOD)NH_{3}, HNO_{3}, HNO_{2}

B)NH_{4}, HNO_{2}, HNO_{3}E)NH_{4}, HNO_{3}, HNO_{2}

C)NH_{3}, HNO_{2}, HNO_{3}

abhinav behal
15-Feb-2020