p-Block Element...

Hot conc. H₂SO₄ acts as moderately strong oxidising agent. It oxidises both metals and nonmetals. Which of the following element is oxidised by conc. H₂SO₄ into two gaseous products?

Correct order of 2nd ionisation energy of C, N, O and F is

Which trend enthalpy is correct ? 

Boiling Point of liquid nitrogen is 

Oxidation of ammonia with CuO produce a gaseous chemical which can also be obtained by:

Which of the following molecular species has unpaired electron(s) ?

Which is the correct order w.r.t the given property? 

The ratio of bond pairs and lone pairs in a P₄ molecule is 

Fluorine does not show variable oxidation states because_________

The halogen which can form both cations and anions is:

 In the third period of the periodic table the element having smallest size is        

The correct statements among the given are :

The halogen which can displace three halogens from their compounds is:

Passage

Phosphorus was discovered by Brand (1669), Scheele isolated from bone ash and Lavoisier proved its elemental nature (1777). The principal minerals are phosphate rock, fluoroacetate, and chloroacetate. Phosphorus is prepared by the direct reduction of phosphorite by carbon in the presence of silica. It exists in different allotropic forms such as yellow or white, red, a-black,f3-black, etc. White P is most reactive, poisonous, glows in dark, and readily catches fire due to unstable discrete P4 molecules. Red P is inert, non-poisonous, does not glow, etc., due to its polymeric structure. a-black, f3 -black allotropes are also chemically inert, do not ignite at normal temperature. It has a layer structure like graphite and acts as a conductor. 

Q. The allotrope of phosphorus with low ignition temperature is:

Passage

Phosphorus was discovered by Brand (1669), Scheele isolated from bone ash and Lavoisier proved its elemental nature (1777). The principal minerals are phosphate rock, fluoroacetate, and chloroacetate. Phosphorus is prepared by the direct reduction of phosphorite by carbon in the presence of silica. It exists in different allotropic forms such as yellow or white, red, a-black,f3-black, etc. White P is most reactive, poisonous, glows in dark, and readily catches fire due to unstable discrete P4 molecules. Red P is inert, non-poisonous, does not glow, etc., due to its polymeric structure. a-black, f3 -black allotropes are also chemically inert, do not ignite at normal temperature. It has a layer structure like graphite and acts as a conductor. 

Q. The allotrope of phosphorus that has layer lattice-like graphite is:

Matching List Type
Choices for the correct combination of elements from Column I and Column II are given as options (a), (b), (c), and (d), out of which one is correct

Match column I with Column II and mark the correct option from the codes given below:

Match the Column I with Column II and mark the correct option from the codes given below :

A brown ring is formed in the ring test for NO₃^– ion. It is due to the formation of

The word Argon represents the term_______

Which of the following halogens does not form oxyacids at room temperature?

Statement Type
This section is based on Statement I and Statement II. Select the correct answer from the codes given below.

Statement I: N₂ is less reactive than P₄.
Statement II: Nitrogen has more electron gain enthalpy than phosphorus.