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The name ‘Rare earths’ is used for...

The name ‘Rare earths’ is used for

A

lanthanoids only

B

actinoids only

C

both lanthanoid and actinoids

D

Alkaline earth metals

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The correct Answer is:
A
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NARAYNA-CLASSIFICATION OF ELEMENTS AND PERIODICITY -EXERCISE - 2 (C.W)
  1. The term periodicity in the properties of element are arranged in the ...

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  2. The one which has incompletely filled d-orbitals in its ground state o...

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  3. The name ‘Rare earths’ is used for

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  4. Give five characteristics of p-block elements.

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  5. The 6th period of the periodic table contains

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  6. Ionic radii vary in

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  7. Which of the following has largest radius?

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  8. An element which lies in the same group of the periodic table as mercu...

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  9. The correct order of the second ionisation potential of carbon, nitrog...

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  10. The order of decreasing atomic radii for Be, Na & Mg is

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  11. From which of the following species in gaseous state it is easiest to ...

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  12. Ionisation of energy F^(ɵ) is 320 kJ mol^(-1). The electronic gain ent...

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  13. The element having very high ionization enthalpy but zero electron af...

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  14. The first ionisation potential of Na is 5.1eV. The value of eectrons g...

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  15. Among halogens, the correct order of amount of energy released in elec...

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  16. The formation of oxide ion O^(2-)(g) from oxygen atom requires first a...

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  17. Electronic configuration of four elements A, B ,C and D are given belo...

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  18. The ionisation energy and electron affinity of an element are 13.0ev a...

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  19. The electronegativity of cesium is 0.7 and that of flourine is 4.0 The...

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  20. If the ionization enthalpy and electron gain enthalpy of an element ar...

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