Chemistry Question Bank

Heating an aqueous solution of aluminium chloride to dryness will give

Alumina may be converted into anhydrous aluminium chloride by:

The incorrect statement regarding above reactions is:

Select the true statements: (i) The formula of the corundum is Al2O3. (ii) The formula of cryolite is Na3AlF6. (iii) The formula of borax is Na2B4O7.10H2O (iv) The formula of bauxite is Al2O3.H2O

In the purification of bauxite by Hall’s process:

AIF3 is soluble in HF only in presence of KF. It is due to the formation of

When excess of NaOH solution is added in potash alum, the product is:

Complex formation is more likely to be possible in _____

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:

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