NDA Government Jobs Exams

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

Read Solution (Total 1)

Correct option is (b)
8 years agoHelpfull: Yes(0) No(0)

NDA Other Question

The most important raw material used in the manufacture of cement are
(A) Potassium nitrate, charcoal and sulphur
(B) Limestone, clay and gypsum
(C) Transition metal oxides, sodium hydroxide or potassium hydroxide
(D) Limestone, sodium carbonate and silica 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+