This set of Chemical Industry Multiple Choice Questions & Answers (MCQs) focuses on “Inorganic Chemical – Boron – Hydrogen”.
1. Which of the following compound exists in liquid state?
a) Diborane
b) Pentaborane
c) Decaborane
d) Borane
View Answer
Explanation: Diborane is a colorless gas. Pentaborane is a colorless liquid. Decaborane is a white solid. Borane is a colorless gas. Borane is also called borine.
2. Which grade hydrogen is used in production of boranes?
a) Zero grade
b) Ultra high purity grade
c) Industrial grade
d) Research grade
View Answer
Explanation: Industrial grade hydrogen is used in the production of boranes. It reacts with sodium metal to form sodium hydride which is used for producing sodium borohydride.
3. Which of the following reaction is wrong?
a) Na+H →NaH
b) 2B5H9 →B10H14 + 2H2
c) 3CH3OH + H3BO3 →B(OCH3)3 + 3H2O
d) 3NaBH4 + BI3 →2B2H6 + 3NaI
View Answer
Explanation: 3NaBH4 + BI3 →2B2 H6 + 3NaI is wrong because sodium borohydride can react only with boron tri fluoride or boron tri chloride but not with boron tri iodide or boron tri bromide.
4. 7(i)+ B(OCH3)3 → NaBH4 + 6(ii)+ 3(iii) Name the compounds i, ii, iii?
a) i.sodium hydride ii.sodium iii.methanol
b) i.sodium Ii.methanol iii.sodium hydride
c) i.sodium ii.sodium hydride iii.methanol
d) i.sodium hydride ii.methanol iii.sodium
View Answer
Explanation: The reaction is 7NaH + B(OCH3)3 → NaBH4 + 6Na + 3CH3OH, hence compound i is sodium hydride, compound ii is sodium and compound iii is methanol.
5. Which of the following is not used as raw material for production of boranes?
a) Methanol
b) Sodium borohydride
c) Glycol ether
d) Mineral oil
View Answer
Explanation: Methanol, boric acid, sodium metal, industrial grade hydrogen, boron tri fluoride or tri chloride, glycol ether, and mineral oil. Sodium borohydride is the product formed during the production of boranes.
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