NDA Government Jobs Exams

Given below is a approximate composition of a substance :
CaO 60-70%
SiO2 20-25%
Al2O2 5-10%
Fe2O3 2-3%
The substance is
(A) Plaster of paris (B) Cement (C) Marble stone (D) Quartz

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NDA Other Question

Which one among the following is the correct order the strength of acids ?
(A) H2SO4 > H3PO3 > CH3COOH (B) H2PO3 > H2SO4 > CH3COOH
(C) CH3COOH > H3PO3 > H2SO4 (D) CH3COOH > H2SO4 > H3PO3 In KMnO4 molecule, the oxidation states of the elements Potassium (K), Manganese (Mn) and Oxygen (O)
are respectively
(A) + 1, + 5, – 2 (B) + 1, + 7, – 2 (C) 0, 0, 0 (D) + 1, + 7, 0