Chemistry Question Bank

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…

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:

Na B O .10H O Na B O X NaBO B O Y z D ¾¾® ¯ D + 39. (S) Borax is used as a cleansing agent because on dissolv- ing in water, it gives:

Na B O .10H O X Y Z D D ¾¾® ¾¾® + X, Y and Z in the reaction are (a) X Na B O , Y NaBO , Z B O = = = (b) X Na B O , Y B O , Z H BO = = = (c) X B O , Y NaBO , Z B(OH) = = = (d) X NaBO , Y B O , Z B(OH) = = =

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 ?

Borax is not used