19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
Al₂O₃ formation from aluminium and oxygen involves evolution of a large quantity of heat, which makes alu- minium used in:
In B₂H₆:
Borazole, B₃N₃H₆ is related to benzene as:
The structure of diborane (B₂H₆) contains :
Which of the following compounds is known as inor- ganic benzene?
What happens when a mixture of cobalt oxide and borax is heated in a flame on a loop of platinum wire ?
Boric acid H₃BO₃ and BF₃ have the same number of elec- trons. The former is a solid and the latter is a gas. The reason is:
H₃BO₃ is:
NaBH₄ + I₂ ® X + Y + Z BF₃ + NaH 450 K ¾¾¾® X + P BF₃ + LiAlH₄ ® X + Q + R X, Y, Z, P, Q and R in the reactions are X Y Z P Q R (a) Na₄B₄O₇ NaI HI HF LiF AlF₃ (b) B₂H₆ NaI H₂ NaF LiF AlF₃ (c) B₂H₆ BH₃ NaI B₃N₃H₆ Al₂F₆…
Which is the hardest compound of boron ?
Which of the following compounds are formed when BCl₃ is treated with water ?
Which of the following statements about anhydrous alu- minium chloride is correct?
The geometry of a complex species can be understood from the knowledge of type of hybridisation of orbitals of central atom. The hybridisation of orbitals of central atom in [B(OH)₄]– and the geometry of the complex a…
The number of OH units directly linked to boron atoms in Na₂B₄O₇.10H₂O is:
Boron cannot form which one of the following anions? (a) BF⁻ (b) BH⁻
AIF₃ is soluble in HF only in presence of KF. It is due to the formation of
Identify X and Y in the following reaction. NaBH 140ºC C H Cl BCl NH Cl X Y + ¾¾¾¾® ¾¾¾¾®
The main factor responsible for weak acidic nature of B—F bonds in BF₃ is:
When aluminium hydroxide dissolves in NaOH solution, the product is:
Which of the following compounds are formed when boron trichloride is treated with water?
Which of the following does not show similarity between boron and aluminium ?
Which of the following hydroxides is acidic ?
Which of the following oxides is acidic in nature ?
Boron is unable to form BF - ions due to
The exhibition of highest co-ordination number depends on the availability of vacant orbitals in the central atom. Which of the following elements is not likely to act as central atom in MF - ?