The valency of the element with atomic number 10 is . . . . . . . (1) 2 (2) 8 (3) 10 (4) 0
Molecular mass of H2SO4 is ...... (1) 58.5 (u) (2) 98 (u) (3) 36.5 (u) (4) 35.5 (u)
Sodium azide NaN3 decomposes explosively to sodium metal and nitrogen gas and is used in automobile air bags. 2NaN3 --> 2Na + 2 N2 Azide ion is iso electronic to .... (1) CO (2) NO (3) CO2 (4)H2O
The chemical formula of Plaster of Paris is (1) Calcium Sulphate [CaSO4] (2) Calcium Sulphate Hemihydrate [CaSO ½H2O] (3) Barium Sulphate [BaSO4] (4) None of these
You have the mythical metal element 'X' that can exhibit variable valences 1, 2 and 5. Which of the following is/are not the correct chemical formula/formulae for the compounds formed by the combination of the "X" ions with different radicals ? (A) XPO4 (B) X2SO4 (C) X5ClO4 (D) X3NO3
(1) Only B (2) B and C (3) A, C and D (4) B and D
The number of atoms in 0.1 mole of Sodium (Na) is
(1) 6.022 × 1023 (2) 6.022 × 1022 (3) 6.022 × 1021 (4) 6.022 × 1024
