Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
JEE Main2017Chemistryd and f Block ElementsActual

In the following reactions, ZnO is respectively acting as a/an, (i) ZnO + Na 2 O → Na 2 ZnO 2 (ii) ZnO + CO 2 → ZnCO 3

Options

  1. Abase and base.
  2. Bacid and acid.
  3. Cacid and base.
  4. Dbase and acid.

Correct answer

C. acid and base.

Step-by-step solution

Amphoteric means it behaves as both acid and base. Na 2 O is basic oxide and ZnO will act as acidic oxide in reacting with this oxide. CO 2 is acidic oxide and ZnO will act as basic oxide in reacting with this oxide. So, with Na 2 O , it acts as an acid and with CO 2 , it acts as a base.

Practice d and f Block Elements on Quantrex Academy →

More from d and f Block Elements

Given below are two statements: Statement I: The number of pairs among [ Ti ⁴⁺, V ²⁺] , [ V ²⁺, Mn ²⁺] , [ Mn ²⁺, Fe ³⁺] and [ V ²⁺, Cr ²⁺] in which both ions are coloured is 3 . S 2026Given below are two statements for catalytic properties of transition metals. Statement I: First row transition metals which act as catalyst utilise their 3d electrons only for 2026The correct order of first ( _i H₁) and second ( _i H₂) ionisation enthalpy values of Cr and Mn are : A. _i H₁ : Cr > Mn B. _i H₂ : Cr > Mn C. _i H₁ : Mn > Cr D. _i H₂ : Mn > Cr Ch 2026The correct statements among the following are. A. Basic vanadium oxide is used in the manufacture of H ₂ SO ₄ . B. The spin-only magnetic moment value of the transition metal hali 2026Given below are two statements : Statement I: Presence of large number of unpaired electrons in transition metal atoms results in higher enthalpies of their atomisation. Statement 2026A paper dipped in a dil. H₂SO₄ solution of ' X ' upon treatment with SO₂ gas turns into green. The compound ' X ' is : 2026Which of the following is NOT a physical or chemical characteristics of interstitial compounds? 2026Pairs of elements with the same number of electrons in their respective 4f orbital are [Atomic number. Eu-63, Gd-64, Dy-66, Ho-67, Tm-69, Yb-70, Lu-71, Hf-72] A. (Eu and Gd) B. (Dy 2026 Full d and f Block Elements list All JEE Main PYQs