19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
Thermite is a mixture of iron oxide and
Which of the following is correct?
Reactivity of borazole is higher than that of benzene because:
What are X and Y in the reaction ? heat 3B H 6X 3[BH (X) ] [BH ] Y 12H + - + ® ¾¾¾® +
Diborane reacts with ammonia under different conditions to give a variety of products. Which one among the following is not fomed in these conditions?
The decreasing order of power of boron halides to act as Lewis acids is (a) BF BCl BBr > > (b) BBr BCl BF > > (c) BCl BF BBr > > (d) BCl BBr BF > >
BF3 is used as catalyst in several industrial processes due to its:
Which one of the following statements regarding BF3 is not correct?
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 - ?
Which of the following does not show similarity between boron and aluminium ?
When aluminium hydroxide dissolves in NaOH solution, the product is:
The main factor responsible for weak acidic nature of B—F bonds in BF3 is:
Group 13 elements show +1 and +3 oxidation states. Relative stability of +3 oxidation state may be given as (a) Tl Ga Al B In + + + + + > > > > (b) B Al Ga In Tl + + + + + > > > > (c) Al Ga Tl In B + + + + + > > > > (…
The stability of +1 oxidation state increases in the se- quence:
Ionisation enthalpy i ( H kJ mol ) - D for the elements of Group 13 follows the order
Trimethylammonia is pyramidal whereas trisilylammonia is a planar molecule. Why ?
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:
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 Al2F…
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:
The structure of diborane (B2H6) contains :
In diborane, the two H – B – H angles are nearly :