Chemistry Question Bank

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:

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?

A mixture of boron trichloride and hydrogen is subjected to silent electric discharge to form ‘A’ and HCl. ‘A’ is mixed with NH3 and heated to 200oC to form ‘B’. The formula of ‘B’ is:

From B2H6, all the following can be prepared except:

o o Re d hot 100 C 160 C H BO X Y B O ; ¾¾¾® ¾¾¾® ¾¾¾® X and Y respectively are:

When strongly heated, orthoboric acid leaves a residue of:

Na B O X H BO . + ® What is X in the reaction ?

Which of the statement is true for the above sequence of reactions?

Boric acid is used in carrom boards for smooth gliding of pawns because:

In the structure of diborane

Na2B4O7.10H2O is correctly represented as:

Which of the following is not true regarding the nature of halides of boron ?

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-

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…