AIIMS Chemistry The P Block Elements Part Of Neet Syllabus Class 12 Questions

The structures of all the oxo-acids of phosphorus are shown below:

H₂O₂ is obtained by the reaction of BaO₂ with sulfuric acid. BaO₂·8H₂O(s) + H₂SO₄(aq) → BaSO₄ + H₂O₂ + H₂O Therefore option (1) is correct.

The inert gas participate in chemical reaction is xenon because the size of xenon is very large which decreases its ionization potential.

In processing of steel which of the following allotropes of carbon is used.

Assertion: $\text{d}^5$ configuration is more stable than $\text{d}^4$ Reason: $\text{d}^5$ has more exchange energy as compared to $\text{d}^4$ because 10 & 6 exchanges are possible in $\text{d}^5$ & $\text{d}^4$ respectively.

Assertion: Hydrogen peroxide forms two series of salts called peroxides and hydroperoxides. Reason: Hydrogen peroxide molecule has two replaceable hydrogen atoms.

Assertion: SiCl₄ gets easily hydrolysed, while CCl₄ does not. Reason: Carbon cannot extend its covalency due to the absence of d-orbitals, but Si can extend its covalency.

Consider the following reactions Here, X, Y and Z respectively, are

KO₂ (potassium superoxide) is used in oxygen cylinder in space and submarines because of it

Assertion (A) Elementary phosphorus exists in three principal allotropic forms, i.e. white (or yellow), red (or violet) and black. Reason (R) Of the three forms, white phosphorus is the most important and most reactive.

Assertion (A) Graphite is a good conductor of heat and electricity. Reason (R) Graphite has all the electrons firmly held together in C—C σ-bonds.

How many P=O bond present in (HPO₃)₃?

For silicon which is not correct?

Which of the following is the correct statement for PH₃?

If Si is doped with B,

Living in the atmosphere of CO is dangerous, because it

S₂O₃²⁻ have

Assertion : H₃PO₂ has strong reducing property but H₃PO₄ does not. Reason : P⁻OH bond present in H₃PO₂.

Assertion : Diamond and graphite do not have the same crystal structure. Reason : Diamond is crystalline while graphite is amorphous.

Assertion : H₂Se is less acidic than H₂S. Reason : S is less electronegative than Se.

Assertion : Fluorine is a stronger oxidizing agent than iodine. Reason : Fluorine is more electronegative than iodine.

Assertion: $\text{Cl}_2$ gas bleaches the articles permanently. Reason: $\text{Cl}_2$ is a strong reducing agent.

Iodine oxidises sodium borohydride to give

The wrong statement about fullerene is

PCl₅ on hydrolysis gives fumes of

First compound of Xe synthesized was

Assertion : H₂S is less acidic than H₂Te. Reason : Te has larger radius than S.

Assertion : The formal oxidation no. of sulphur in Na₂S₂O₆ is 2.5. Reason : Two S⁻atoms are not directly linked with O⁻atoms.

Assertion: Helium has the highest value of ionisation energy among all the elements known. Reason: Helium has the highest value of electron affinity among all the elements known.

Assertion: Conductivity of silicon increases by doping it with group^{-15} elements. Reason: Doping means introduction of small amount of impurities like P, As or Bi into the pure crystal.

Which of the following is an example of chain silicates?

Incorrect statement about Ge is

XeF₆ on complete hydrolysis produces

The repeating unit in silicone is

Among the following components of cement which is present in highest amount?

Assertion : Ozone is an allotrope of oxygen. Reason : Oxygen is bluish colour liquid and in singlet state it is more paramagnetic.

Assertion : SnI₄ is an orange solid. Reason : The colour arises due to charge transfer.

Borax is used as a cleansing agent because on dissolving in water it gives

The incorrect statement among the following is (a) C₆₀ is an allotropic form of carbon

Assertion : Silicones are hydrophobic in nature. Reason : Si–O–Si linkages are moisture sensitive.

The number of P–O–P bridges in the structure of phosphorus pentoxide and phosphorus trioxide are respectively

In diborane, the two H–B–H angles are nearly

F₂ formed by reacting K₂MnF₆ with

Assertion : SiF₆²⁻ is known but SiCl₆²⁻ is not. Reason : Size of fluorine is small and its lone pair of electrons interacts with d-orbitals of Si strongly.

Assertion : Borax bead test is not suitable for Al(III). Reason : Al₂O₃ is insoluble in water.

Assertion : Extraction of iron metal from iron oxide ore is carried out by heating with coke. Reason : The reaction Fe₂O₃(s) → Fe(s) + 3/2 Ω₂(g) is a spontaneous process.

The element which forms oxides in all oxidation states +1 to +V is

Shape of O₂F₂ is similar to that of

The true statement for the acids of phosphorus, H₃PO₂, H₃PO₃ and H₃PO₄ is

Which of the following compound is a tribasic acid?