Question

8. Which of the following represents correct order of decreasing Eir or reducing nature?
(a) Li > Na> K > Rb
(b) Rb > K > Na > Li
(c) Rb > li > Na> K
(d) Li > Rb > K > Na

9. Select the correct statement:
(a) Oxides (M20 type) and peroxides (M202 type) of alkali metals are colourless and diamagnetic
(b) Li and Na do not form superoxides
(C) Superoxides (M02) are formed by K, Rb and Cs. These are paramagnetic
(d) All above are correct

10. Which is incorrectly matched
(i) Basic strength Cs20< Rh20<K20<Na20
(ii) Stability of Na2O2 <K202 < Rb202 <Cs202 peroxides
(iii) Stability of LiHCO3 < NaHCO3 <KHCO3 <RbHCO3 <CSHCO3
(iv) Melting point NaF < NaCl < NaBr < Nal
(a) (i) and (iv)
(b) (i) and (iii)
(c) (i) and (ii)​

Answer 1

Answer:

Explanation:

8) (c) Rb > li > Na> K

9) (b) Li and Na do not form superoxides

10) d)  Melting point NaF < NaCl < NaBr < Nal