Which of the following facts regarding boron and silicon in true?A. Boron is used to make boron steel or boron carbide control rods for nuclear reactor.B. Boron and silicon form halides which are not hydrolysed.C. Boron and silicon react with magnesium to form magnesium boride and magnesium silicide which are decomposed by acids to give volatile borane and silane, respectively.D. Both boron and silicon react with alkali to form borates and silicates containing `BO_(3)^(3-)` and `SIO_(4)^(4-)` tetrahedral units, respectively.

Which of the following facts regarding boron and silicon in true?A. Bo

1.	Which of the following facts regarding boron and silicon in true?A. Boron is used to make boron steel or boron carbide control rods for nuclear reactor.B. Boron and silicon form halides which are not hydrolysed.C. Boron and silicon react with magnesium to form magnesium boride and magnesium silicide which are decomposed by acids to give volatile borane and silane, respectively.D. Both boron and silicon react with alkali to form borates and silicates containing `BO_(3)^(3-)` and `SIO_(4)^(4-)` tetrahedral units, respectively.
Answer» Correct Answer - A::B::D (B)`BCl_(3)+3H_(2)O overset("Hydrolysis")to H_(3)BO_(3) + 3HCl , SiCl_(4)+3H_(2)O overset("Hydrolysis")to H_(2)SiO_(3) + 4HCl` ( C)`B+Mg to Mg_(3)B_(2) +H_(3)PO_(4) to "Mix of borones" overset(Delta) to B_(2)H_(6)` (D)`2B+6NaOH to 2Na_(3)BO_(3) + 3H_(2) , Si+4NaOH to Na_(4)SiO_(4) + 2H_(2)`

vii. The stability of dihalides of ` Si, Ge , Sn` and Pb increases steadily in the sequence :A. `GeX_(2) lt SiX_(2) lt SnX_(2) lt PbX_(2)`B. `SiX_(2) lt GeX_(2) lt PbX_(2) lt SnX_(2)`C. `SiX_(2) lt GeX_(2) lt SnX_(2) lt PbX_(2)`D. `PbX_(2) lt SnX_(2) lt GeX_(2) lt SiX_(2)`
When `H_2S` is passed through acidified `KMNO_4`, we getA. `K_(2)SO_(4)`B. `MnO_(2)`C. `KHSO_(3)`D. Sulphur
The`3ClO^(-)(aq.)to ClO_(3)^(-)(aq.)+2Cl^(-)(aq.)` is an example ofA. oxidation reactionB. disproportionationC. reduction reactionD. decomposition
The reaction: `ClO_(3)^(-) +I_(2) to IO_(3)^(-)+Cl_(2)`A. is possibleB. depends upon the state of productsC. is not possibleD. depends upon the temperature
In the reaction: `3Br_(2)+6OH^(Theta)rarr 5Br^(Theta)+BrO_(3)^(Theta)+3H_(2)O,Br_(2)` isA. is reducedB. is oxidizedC. disproportionatesD. disintegrate
`NaClO_(3)` is obtained by reacting `Cl_(2)` andA. cold dil. NaOHB. hot conc. NaOHC. cold `Na_(2)O_(2)`D. hot `Na_(2)O_(2)`
Which of the following is acidic oxides ?A. `HClSO_(4)`B. `MgO`C. `Al_(2)O_(3)`D. `CaO`
Which of the following is more acidic oxyacid ?A. `HClO_(4)`B. `HClO`C. `HClO_(3)`D. `HClO_(2)`
Oxygen orm acidic oxide withA. CaB. NaC. SD. K
Of the following, the most acidic isA. `As_(2)O_(3)`B. `P_(2)O_(3)`C. `Sb_(2)O_(3)`D. `Bl_(2)O_(3)`