D and F Block Elements Archives - Page 4 of 10

CrO₃ dissolves in aqueous NaOH to give Options (a) CrO₄²⁻ (b) Cr(OH)₃⁻ (c) Cr₂O₇²⁻ (d) Cr(OH)₂ Correct Answer: CrO₄²⁻Explanation:No explanation…

7 years ago

On the extraction of iron, the slag produced is Options (a) CO (b) FeSiO₃ (c) MgSiO₃ (d) CaSiO₃ Correct Answer:…

7 years ago

Aufbau principle does not give the correct arrangement of filling up of atomic orbitals in Options (a) Cu and Zn…

7 years ago

How many FeSO₄.7H₂SO₄ will be oxidised by an acidified solution containing 9.48 g KMnO₄ Options (a) 83.4 g (b) 16.7…

7 years ago

Which of the following cations has the maximum number of unpaired electrons Options (a) Mn²⁺ (b) Fe²⁺ (c) Co²⁺ (d)…

7 years ago

A mixture of two salts is not soluble in water but dissolves completely in dilute hydrochloric acid to form a…

7 years ago

Transition metals show paramagnetism Options (a) due to characteristic configuration (b) high lattice energy (c) due to variable oxidation states…

7 years ago

Which of the following trivalent ion has the largest atomic radii in the lanthanide series Options (a) La (b) Pm…

7 years ago

Which of the following metals acts as the most efficient catalyst Options (a) Alkaline earth metals (b) Transition metals (c)…

7 years ago

Which of the following lanthanide is commonly used Options (a) Lanthanum (b) Nobelium (c) Thorium (d) Cerium Correct Answer: CeriumExplanation:No…

7 years ago