Test: Main Group - 1 - Chemistry MCQ

The characteristics of the blue solution of solution of sodium in liquid ammonia is/are:

Do you expect the minimum energy necessary to eject a 3s electron from phosphorus in a photoelectron spectroscopy experiment for the process.

[Ne] 3s²3p³ → [Ne] 3s¹3p³ + e^- ,

Be larger than, smaller than, or the same as the 4^th io nization energy (IE₄) of phosphorus:

Which of the following will be strongest acid in pure liquid HF:

What is the nature of silicon–oxygen bonds in silica(SiO₂): 

The melting point of lithium metal is 454 K, and that of sodium is 371 K. Which is the following statements can explain this difference in their melt ing points:

(I) Metallic bonding in lithium is stronger than metallic bonding in sodium.
(II) The delocalized electrons are more strongly attracted to the metal cation of lithium.
(III) The lithium cations have a greater charge density than sodium cation.
(IV) Li⁺ cations are smaller than Na⁺ cations.

Although both NF₃ and NCl₃ are covalent, NCl₃ undergoes hydrolysis whereas NF₃ does not because:

The Lewis acidity of BF₃ is less than BCl₃ even though fluorine is more electronegative than chlorine. It is due to:

Pyroenes are a class of silicate minerals, which exhibit a polymeric chain structure, as shown below:

Its simplest repeat unit is 

In the following reactions: 

The reagent/conditions X and Y are:

Among the following, the group of molecules that undergoes rapid hydrolysis is:

The reaction of so lid XeF₂ with AsF₅ in 1:1 ratio affords:

For Et₂AlX (X = PPh₂^–, Ph^–, Cl^{– –}and H^–), the tendency towards dimeric structure fo llows the order:

Na₂HPO₄ and NaH₂PO₄ on heating at high temperature produce a chain sodium pentaphosphate quantitatively.

Q.

The ideal molar ratio of Na₂HPO₄ to NaH₂PO₄ is:

Na₂HPO₄ and NaH₂PO₄ on heating at high temperature produce a chain sodium pentaphosphate quantitatively.

Q. 

The total charge on pentaphosphate anion is:

Among the following substituted silanes, the one that gives cross–linked silicone polymer upon hydrolysis is:

Among the following donors, the one that forms most stable adduct with the Lewis acid B(CH₃)₃ is:

The IUPAC nomenclature on Na[PCl₆] is:

If a mixture of NaCl, conc. H₂SO₄ and K₂Cr₂O₇ is heated in a dry test tube, a red vapour (P) is formed. This vapour (P) dissolves in aqueous NaOH to form a yellow solution, which upon treatment with AgNO₃ forms a red solid (Q). P and Q are, respectively:

Heating a mixture of ammonium chloride and sodium tetrahydridoborate gives one liquid product(X), along with other products under ambient conditions.

NH₄Cl + NaBH₄ ------------> X + H₂ + NaCl

Q.

Compound X is:

Heating a mixture of ammonium chloride and sodium tetrahydridoborate gives one liquid product(X), along with other products under ambient conditions.

NH₄Cl + NaBH₄ ------------> X + H₂ + NaCl

Q. 

Compound X is an example of:

An example of nido–borane from the following is:

The number of S–S bonds in H₂S₅O₆ is

The ease of formation of the adduct, NH₃ · BX₃ (where X = F, Cl, Br) follows the order:

Ammonolysis of S₂Cl₂ in an inert solvent gives:

Using Wade’s  rule predict the structure of B₅H₉:

Which among the following is a “superoxide”:

Aqua regia is a powerful oxidizing agent because it contains: