NDA
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Three elements Na, S and O combine to from a compound Na2SO6. What is the valency of S this compound ?
(A) 2+ (B) 4+ (C) 6+ (D) 8+
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NDA Other Question
Which one among the following equations is correctly balanced ?
(A) NaOH + Al + H2O → 2H2 + NaAlO2
(B) 2NaOH + 2Al + 2H2O → 3H2 + 2NaAlO2
(C) 2NaOH + 2Al + 3H2O → 4H2 + 2NaAlO2
(D) 2NaOH + 2Al + H2O → H2 + 2NaAlO2
Which one among the following is the equivalent with of sulphuric acid ?
(Atomic weight : H = 1, S = 32, O = 16)
(A) 98 (B) 60 (C) 100 (D) 49