Sign in
12thPass logo
New chatPYQ LibraryDoubtsRank report
Sign in to see Recents

Your guest activity stays on this device

Sign in to save progress →
Sign in

D and F Block Elements question

2020 · 6 Sep · Shift 2 · Q3
Guest · filters and generic practice availableBrowsing as a guest · PYQ filters and generic practice are available. Sign in only for personalised features and saved progress.
  1. PYQ Library
  2. /JEE Main
  3. /Chemistry
  4. /D and F Block Elements
  5. /2020 · 6 Sep · Shift 2 · Q3

D and F Block Elements question

2020 · 6 Sep · Shift 2 · Q3

JEE MainChemistryD and F Block ElementsMCQ+4 / −1
Mischmetal is an alloy consisting mainly of :
  1. A
    lanthanoid and actinoid metals
  2. B
    actinoid and transition metals
  3. C
    lanthanoid metals
  4. D
    actinoid metals
View written solutionFree

Correct answer: C

  1. Recall the definition of Mischmetal

    Mischmetal is a well-known alloy used in lighter flints and other applications. It consists mainly of lanthanoid metals.

  2. Typical composition

    Mischmetal generally contains:

    • about 95%95\%95% lanthanoids (especially cerium, lanthanum, neodymium, etc.)
    • small amounts of iron, and traces of other metals

    So its principal constituents are lanthanoid metals.

  3. Evaluate the options

    • A: lanthanoid and actinoid metals

      Incorrect. Actinoids are not the main components of mischmetal.

    • B: actinoid and transition metals

      Incorrect. Mischmetal is not mainly composed of actinoids.

    • C: lanthanoid metals

      Correct. Mischmetal is mainly an alloy of lanthanoid metals.

    • D: actinoid metals

      Incorrect. Actinoids are not the main constituents.

  4. Final answer

    Therefore, the correct option is: C\boxed{\text{C}}C​

PreviousNext

More from D and F Block Elements

  • The atomic radius of Ag is closed to :2020 · MCQ
  • Consider the following reactions : NaCl+K2​Cr2​O7​+(conc.)H2​SO4​​→ (A) + side products (A) + NaOH → (B) + Side products (B)+(dilute)H2​SO4​​+H2​O2​…2020 · Numerical
  • 5 g of zinc is treated separately with an excess of (a) dilute hydrochloric acid and (b) aqueous sodium hydroxide. The ratio of the volumes of H2​ evolved in these two reactions is :2020 · MCQ
  • The sum of the total number of bonds between chromium and oxygen atoms in chromate and dichromate ions is ​.2020 · Numerical
  • The statement that is INCORRECT about the interstitial compounds is :2019 · MCQ
  • The maximum number of possible oxidation states of actinoides are shown by :2019 · MCQ
  • The transition element that has lowest enthalpy of atomisation, is :2019 · MCQ
  • Consider the hydrated ions of Ti2+, V2+, Ti3+, and Sc3+. The correct order of their spin-only magnetic moments is :2019 · MCQ