Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
KCET2014ChemistrySome Basic Concepts of Chemistry

The correct statement is

Options

  1. AThe extent of actinoid contraction is almost the same as lanthanoid contraction.
  2. B( C e⁴⁺ ) in aqueous solution is not known.
  3. CThe earlier members of lanthanoid series resemble calcium in their chemical properties.
  4. DIn general, lanthanoids and actinoids do not show variable oxidation states.

Correct answer

B. ( C e⁴⁺ ) in aqueous solution is not known.

Step-by-step solution

Most stable oxidation state for lanthanoid is ( +3 ). Therefore, ( Ce ⁴⁺ ) acts as a good oxidizing agent in solution due to ability to get reduced to ( Ce ³⁺ ) easily. Hence, ( C e⁴⁺ ) in aqueous solution is not known.

Practice Some Basic Concepts of Chemistry on Quantrex Academy →

More from Some Basic Concepts of Chemistry

How many molecules of C O₂ (g) are obtained on reaction of 24 grams of methane with 4moles of oxygen? 2026500 mL of an aqueous solution of glucose C₆ H₁₂ O₆ (Molar mass 180 gmol ⁻¹ ) contains 6.02 10²² molecules. The concentration of the solution will be: 2026The mass of precipitate formed when 50 mL of 16.9% aqueous solution of AgNO ₃ is mixed with 50 mL of 5.8% NaCl solution is------------g [Ag = 107.8, N = 14, O = 16, Na = 23, Cl = 3 2026100 mL of 1.0 M aqueous NaOH solution was diluted to 1.0 L by adding water. Half of this solution was discarded. A new 100 mL of 0.5 M aqueous NaOH solution was added to the remain 2026From the given information, select the suitable law of chemical combination: Cupric Carbonate % of Cu % of C % of O Natural Sample 51.35 9.74 38.91 Synthetic Sample 51.35 9.74 38.9 2026Match List-I with List-II and select the correct option (Based on mole concept): List-I List-II (a) 2 moles of ethene (i) 11.2 L volume at STP (b) Mass is equal to 66 g (ii) 56 g ( 2026The mass of a mixture containing NaCl and NaBr is 4.0 g. If Na is 30 % of the total mixture, the composition of NaCl in the mixture is 2025Two acids A and B are titrated separately. 25 mL of 0.5 M Na ₂ CO ₃ solution requires 10 mL of A and 40 mL of B for complete neutralisation. The volume (in L) of A and B required t 2025 Full Some Basic Concepts of Chemistry list All KCET PYQs