p-Block Element...

Which of the following compounds is/are obtained by heating boric acid?

a. HBO₂
b. H₂B₄O₇
c. B₂O₃

The maximum oxidation state shown by any p-block element is

As we move from B to Al in the p-block elements the sum of the first three ionisation enthalpies

Directions: In the given question, two statements are provided which are labeled as Assertion (A) and Reason (R). Read both of them carefully and select the alternative that most suitably follows the statements.

Assertion (A): Diamond is a bad conductor of electricity.
Reason (R): All C-C bond lengths in diamond are of 154 pm.

There are six groups of p-block elements in the periodic table numbering from

One of the following p-block elements has unusually low melting point

The stability of the dihalides of Si, Ge, Sn and Pb increases steadily in the sequence

The valence shell electronic configuration of p-block elements is ns2np1-6. But this is not true in the case of

Aluminium should not be washed with materials containing washing soda as

Graphite is a smooth lubricant that is extremely difficult to melt. The reason for this anomalous behaviour is that graphite

Which of these is not a monomer for a high molecular mass silicon polymer?

Which of the following is the correct increasing order of oxidizing power?

Which of the following is not isostructural with SiCl₄?

The tendency of BF₃, BCl₃ and BBr₃ to behave as Lewis acids decreases in the sequence

Which of the following statements are correct?

a. Fullerenes have dangling bonds.
b. Fullerenes are cage-like molecules.
c. Graphite is thermodynamically the most stable allotrope of carbon.
d. The successive layers in graphite are held together by weak forces of attraction.

PbCl₄ exists while PbBr₄ and PbI₄ do not because

A colourless aqueous solution, on adding water and on heating, gave a white precipitate. This precipitate, when reacted with NH₄Cl and NH₄OH in excess, resulted in dissolution of some of the precipitate and a gelatinous precipitate is obtained. What is the hydroxide formed in aqueous solution?

If CO₂ is passed through water, which of the following species will be present in water?

Which of the following anions is present in the chain structure of silicates?

Borax is prepared by treating colemanite with

The variation in properties in a group of p-block of elements is due to

Among the following which is the strongest oxidizing agent?

The stability of + 1 oxidation state increases in the sequence 

The sum of the s and p-electrons is called

Which of the following does not exist in free form?

Which of the following statements is not correct?

Inert pair effect of p-block elements is due to the

Which of the following statements is correct?

The correct order of C-O bond length among CO, CO₃^2- and CO₂ is

Boron forms only covalent compounds and not +3 ions because