Related InterviewSolutions

• What are silicones?
• Consider the following statements.(i) All Silicones are hydrophilic in nature.(ii) Silicones are thermal and electrical insulators.(iii) Chemically silicones are highly reactive.Which of the above statement(s) is/are not correct? (a) (i) and (ii)(b) (i) and (iii)(c) (ii) and (iii)(d) (ii) only
• Complete the following reactions:(a) B(OH)3 + NH3 →(b) Na2B4O7 + H2SO4 + H2O →(c) B2H6 + 2NaOH + 2H2O →(d) B2H6 + CH3OH →(e) BF3 + 9H2O →(f) HCOOH + H2SO4 →(g) SiCl4 + NH3→(h) SiCl4 + C2H5OH →(i) B + NaOH →
• Why silicones are water repellent?
• Find out the incorrect pair:(a) Nitrogen – Tetragens(b) Oxygen – Chalcogens(c) Tin – Tetragens(d) Gallium – Icosagens
• Find out the incorrect pair:(a) Boron is BF3 – +3(b) Carbon in CO2 – +4(c) Nitrogen in N2O5 – +5(d) Fluorine in OF2 – +4
• Find out the incorrect pair:(a) McAfee process – AlCl3(b) Burnt alum – K2SO4 -Al2(SO4)(c) Oxo process – Propanal(d) Fischer tropsch Synthesis – HCOOH
• In the following questions a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.(a) A and R are correct and R explains A.(b) A and R are correct and R not explains A.(c) A is correct but R is wrong.(d) A is wrong but R is correct.Assertion (A) –Noble gases are least reactivity.Reason (R) –Noble gases have completely filled s and p-orbital and attain stable electronic configuration.
• Fill in the blanks:1. …………… is the general electronic configuration of tetragen elements.2. Boron and silicon form …………… hydrides.3. …………… is most reactive element among the halogens.4. Most stable oxidation state of aluminium is ……………5. General formula of metal boride is ……………6. Boron has the capacity to absorb ……………7. …………… is used as a rocket fuel igniter.8. …………… is essential for the cell walls of plants.9. …………… is a chemical formula of boron.10. …………… is used for the identification of coloured metal ions.
• Mention the properties of silicones.