Chemistry NCERT Exemplar Solutions Class 11th Chapter Eight

'A' and 'B' in the following reactions are:

Given below are two statements:

Statement I : Colourless cupric metaborate is reduced to cuprous metaborate in a luminous flame.

Statement II :  Cuprous metaborate is obtained by heating boric anhydride and copper sulpahte in a non-luminous flame.

In the light of the above statements, choose the most appropriate answer from the options given below

Consider the elements Mg, Al, S, P and Si, the correct increasing order of their first ionization enthalpy is:

The electrode potential of M²⁺ / M of 3d- series elements shows positive value for:

Identify products A and B

Given below are two statements:

Statement I: On heating with KHSO₄, glycerol is dehydrated and acrolein is formed.

Statement II:  Acrolein has fruity odour and can be used to test glycerol's presence.                  

Choose the correct option.

Drugs used to bind to receptors inhibiting its natural function and blocking a message are called:

During the denaturation of proteins, which of these structure will remain intact?

Melamine polymer is formed by the condensation of:

 

An organic compound 'A' on reaction with NH₃ followed by heating gives compound B. Which on further strong heating gives compound C(C₈H₅NO₂). Compound C on sequential reaction with ethanolic KOH, alkyl chloride and hydrolysis with alkali gives a primary amine. The compound A is: