Previous Year Papers

Download Solved Question Papers Free for Offline Practice and view Solutions Online.

Test Series

Take Zigya Full and Sectional Test Series. Time it out for real assessment and get your results instantly.

Test Yourself

Practice and master your preparation for a specific topic or chapter. Check you scores at the end of the test.

Hydrogen

Long Answer Type

91.

Distinguish clearly between salt like hydrides and covalent hydrides.

498 Views

92.

What do you understand by:
(i) electron deficient
(ii) electron-precise and
(iii) electron rich compounds of hydrogen?
Provide justification with suitable examples.

3199 Views

Short Answer Type

93.
What characteristics do you expect from an electron-deficient hydride with respect to its structure and chemical reactivity ?

Since electron deficient hydrides have lesser electrons to form normal covalent bonds, therefore we expect the following characteristics from these hydrides:

(i) They generally exist in polymeric forms such as B₂H₆, B₄H₁₀.(AlH₃)_n etc.

(ii) They react with many metals, non-metals and their compounds. Hence these hydrides are very reactive.

(iii) They act as Lewis acids and thus form complexes with Lewis bases.

110 Views

94.

Do you expect the carbon hydride of the type(C_nH_2n+2) to act as Lewis acid or base?

482 Views

Long Answer Type

95.

What do you understand by the term ‘non-stoichiometic hydrides’? Do you expect this type of hydrides to be formed by alkali metals?

260 Views

Short Answer Type

96.

Saline hydrides are known to react with water violently producing fire. Can CO₂, a well-known fire extinguisher, be used in this case? Explain.

821 Views

97.

What do you expect the nature of hydrides if formed by elements of atomic numbers 15, 19, 23, 44 with dry dihydrogen? Compare their behaviour towards water.

210 Views