Engineering Questions with Answers - Multiple Choice Questions
Chemical Industry MCQ’s – Inorganic Chemical – Boron – Hydrogen
1 - Question
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 - Question
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 - Question
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 - Question
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 - Question
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.