15 - p block elements Questions Answers

what is relation between lead chamber process and contact processs?

Asked By: IFTIKAR AHMAD 3 year ago
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Lines from NCERT p block (page 309 XI) says : 

For example, in +5 oxidation state both N and P form oxoanions : NO3- (three-coordination with π – bond involving one nitrogen p-orbital) and PO3-4  (four-coordination involving s, p and d orbitals contributing to the π – bond).

What does lines in bold means { I want to know how can we predict which orbitals are used for pi bond in nitrate and phosphate ions}, please explain in detail.

Asked By: VAIBHAV GUPTA 5 year ago
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Arrange The Following in increasing order of boiling points and give reason :

1-chloropropane , isopropylchloride , 1-chlorobutane ,

Asked By: AAYUSH TANEJA 5 year ago
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Answer Strategies and trick by Manish sir (it will help you to solve it by yourself)

1-chloropropane < 1-chlorobutane < isopropylchloride

Arrange The Following in increasing order of boiling points and give reason :

Dibromomethane , bromoform , Chloromethane , Dichloromethane .

 

Asked By: AAYUSH TANEJA 5 year ago
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Answer Strategies and trick by Manish sir (it will help you to solve it by yourself)

Chloromethane, Dichloromethane, Dibromomethane, Bromoform

B P increases with molecular mass 

 

Account For the following

(i) ClF3 exists but FCldosent.?

(ii) Chlorine water loses its color on standing?

Asked By: AAYUSH TANEJA 5 year agoSolved By: SARIKA SHARMA
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Which among the following is the strongest oxidizing agent and why??    IO4-  BrO4-  ClO4-       

 

Asked By: AAYUSH TANEJA 5 year ago
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Answer Strategies and trick by Manish sir (it will help you to solve it by yourself)

 Inertness of BrO4- at room temperature stands in sharp contrast to its high thermodynamic oxidizing power, which is greater than that of any other oxohalogen ion that persists in aqueous solution. The oxidation potential is
BrO4-+ 2H+ + 2e- -------> BrO3- + H2O                              E =  +1.853 V

(1.201 V for ClO4- and 1.653 V for IO4-)

why HF can not store in glass container?

Asked By: TAPAS MAITY 6 year agoSolved By: SARIKA
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Ozone is more denser than air as 1mole of O3 & 1mole O2  will have same vol @ STP ie 22.4L  as oxygen is denser than air therefore ozone should be more denser than air as densityα mass  & mol mass of ozone is gr8ter than o2. Then why ozone is found in strastosphere not on earth.?Z?

Asked By: SARIKA 6 year ago
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What is the difference b/w metalloids & semimetals.

Asked By: SARIKA 6 year ago
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Answer Strategies and trick by Manish sir (it will help you to solve it by yourself)

A metalloid is a chemical element  that has properties that are in between or a mixture of those of metals and nonmetals and is consequently difficult to classify unambiguously as either a metal or a nonmetal. There is no standard definition of a metalloid, nor is there agreement as to which elements are appropriately classified as such. Despite this lack of specificity the term remains in use in chemistry literature.The six elements commonly recognised as metalloids are B, Si, Ge, As, Sb, Te

 

 A semimetal is a material with a very small overlap between the bottom of the conduction band and the top of the valence band. A semimetal thus has no band gap and a negligible density of states at the fermi level. A metal, by contrast, has an appreciable density of states at the Fermi level because the conduction band is partially filled.

Is flurine has more oxidising power ?

Asked By: GOWTHAM 6 year ago
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Answer Strategies and trick by Manish sir (it will help you to solve it by yourself)

yes it is a very good oxidising agent

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