Problem 69
Boric acid is a very weak acid but in presence of certain organic compounds, it acts a s a strong acid. Which one of the following organic compounds can affect such change? (a) Fromic acid (b) Glycerol (c) Ethyne (d) Ethyl alcohol
Problem 69
Which does not exist? (a) \(\left[\mathrm{SiCl}_{6}\right]^{2-}\) (b) \(\left[\mathrm{CCl}_{6}\right]^{2-}\) (c) \(\left[\mathrm{SnCl}_{6}\right]^{2-}\) (d) \(\left[\mathrm{GeF}_{6}\right]^{2-}\)
Problem 70
The structure of diborane \(\left(\mathrm{B}_{2} \mathrm{H}_{6}\right)\) contains (a) Four 2c-2e bonds and two \(3 \mathrm{c}-2 \mathrm{e}\) bonds (b) Two \(2 \mathrm{c}-2 \mathrm{e}\) bonds and four \(3 \mathrm{c}-2 \mathrm{e}\) bonds (c) Two \(2 \mathrm{c}-2 \mathrm{e}\) bonds and two \(3 \mathrm{c}-3 \mathrm{e}\) bonds (d) Four \(2 \mathrm{c}-2 \mathrm{e}\) bonds and four \(3 \mathrm{c}-2 \mathrm{e}\) bonds
Problem 70
\(\mathrm{SiO}_{2}\) is reacted with sodium carbonate. What is the gas liberated? (a) \(\mathrm{O}_{2}\) (b) \(\mathrm{O}_{3}\) (c) \(\mathrm{CO}\) (d) \(\mathrm{CO}_{2}\)
Problem 71
What is the formula of carbon suboxide? (a) \(\mathrm{C}_{3} \mathrm{O}_{2}\) (b) \(\mathrm{C}_{2} \mathrm{O}_{4}\) (c) \(\mathrm{CO}\) (d) \(\mathrm{CO}_{2}\)
Problem 71
In which of the following reaction boron does not act as reducing agent? (a) \(\mathrm{B}+\mathrm{CO}_{2} \rightarrow\) (b) \(\mathrm{B}+\mathrm{Mg} \rightarrow\) (c) \(\mathrm{B}+\mathrm{HNO}_{3} \rightarrow\) (d) \(\mathrm{B}+\mathrm{SiO}_{2} \rightarrow\)
Problem 72
In which of the following silicates, cyclic structure is present? (a) Emerald (b) Talc (c) Mica (d) Asbestos
Problem 72
Diborane can't be obtained from (a) \(\mathrm{NaBH}_{4}+\mathrm{I}_{2}\) (b) \(\mathrm{Na}_{2} \mathrm{~B}_{4} \mathrm{O}_{7}+\mathrm{HCl}\) (c) \(\mathrm{BF}_{3}+\mathrm{NaH}\) (d) \(\mathrm{BF}_{3}^{2}+\mathrm{LiAlH}_{4}\)
Problem 73
Borax is converted into B by following steps Borax \(\stackrel{\mathrm{A}}{\longrightarrow} \mathrm{H}_{3} \mathrm{BO}_{3} \stackrel{\triangle}{\longrightarrow} \mathrm{B}_{2} \mathrm{O}_{3} \stackrel{\mathrm{B}}{\longrightarrow}\) Product Reagents \((\mathrm{A})\) and \((\mathrm{B})\) are: (a) Acid, \(\overline{F e}\) (b) Acid, \(\mathrm{Mg}\) (c) Acid, Sn (d) Acid, Al
Problem 73
Which one of the following is a correct set for \(\mathrm{SiO}_{2} ?\) (a) Angular, basic (b) Linear, basic (c) Linear, acidic (d) Tetrahedral, acidic
