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:
The main factor responsible for weak acidic nature of B—F bonds in BF₃ is:
Na₂B₄O₇.10H₂O is correctly represented as:
The purest form of coal is
Identify the incorrect statement.
Which one of the following is the correct statement ?
Glass and cement are two important examples of
BCl₃ does not exist as a dimer but BH₃ exists as B₂H₆ because
Boric acid is used in carrom boards for smooth gliding of pawns because:
In B₂H₆:
Borazole, B₃N₃H₆ is related to benzene as:
The hardest substance is
The structure of diborane (B₂H₆) contains :
Which of the following compounds is known as inor- ganic benzene?
Buckminsterfullerence is
H₃BO₃ is:
Boric acid has a polymeric layer structure in which planar BO₃ units are joined by
In graphite, the layers of carbon atoms are held by
On hydroloysis, diborane produces
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…
Identify the wrong example from the following for the group 14 elements.
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:
AIF₃ is soluble in HF only in presence of KF. It is due to the formation of
What happens when a mixture of cobalt oxide and borax is heated in a flame on a loop of platinum wire ?