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:
Aluminium vessels should not be washed with materials containing washing soda since :
Which one is the wrong statement ?
Alumina is:
Thermite is a mixture of iron oxide and
Which of the following is correct?
Reactivity of borazole is higher than that of benzene because:
Which of the following is a false statement ?
The power of halides of boron to act as Lewis acids decreases in the order:
The main factor responsible for weak acidic nature of B—F bonds in BF3 is:
BCl3 does not exist as a dimer but BH3 exists as B2H6 because
Which one of the following is the correct statement ?
The hardest compound of boron is:
Boron cannot form which one of the following anions? (a) BF- (b) BH-
Carbon and silicon belong to (IV) group. The maximum coordination number of carbon in commonly occurring compounds is 4, whereas that of silicon is 6. This is due to (AIPMT 1994)
Boron nitride can be represented by the given structure. The structure of BN is similar to
The bonds present in borazole are:
Which of the following compounds is known as inor- ganic benzene?
Borazole, B3N3H6 is related to benzene as:
In B2H6:
On the addition of mineral acid to an aqueous solution of borax, the following compound is formed:
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…
Which of the following compounds are formed when BCl3 is treated with water ?
Which of the following is the electron deficient molecule ?
Which is the hardest compound of boron ?