CBSE > Class 12 > Chemistry | CBSE Board | Homework Help

It means that Pb4+ can distort the negative electron cloud on Cl- towards the centre of the bond more effectively than the Pb2+ ion as Pb4+ has greater positive charge. Therefore, it means that PbCl4 will be more covalent than PbCl2 (FAJAN'S RULE).

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What is the principle behind zine refining of metals?

Posted by Anjali Kalange 6 years, 10 months ago

CBSE > Class 12 > Chemistry

2 answers

Md Shakir 6 years, 10 months ago

dust particle are more soluble in solvent other than solid

1Thank You

Anjali Kalange 6 years, 10 months ago

I meant zone

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Reducing character decreases from SO2 to TeO2. Why?????

Posted by Himanshu Thakur 6 years, 10 months ago

CBSE > Class 12 > Chemistry

1 answers

Suhani Rana? 6 years, 10 months ago

As we move down the group metallic character increases and non metallic character decreases and non metals are good reducing agent also stability of highest state decreases down the group

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What is the role of NaCN in isolation of gold?

Posted by Anjali Kalange 6 years, 10 months ago

CBSE > Class 12 > Chemistry

2 answers

Yashwanth Venkat 6 years, 10 months ago

Acts as depressant

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Sonal Sonal 6 years, 10 months ago

Used as a solvent

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What happens whn dialysis is prolonged?

Posted by Leena Gupta 6 years, 10 months ago

CBSE > Class 12 > Chemistry

2 answers

A Jaiswal 6 years, 10 months ago

Yes,Coagulation take place ?

2Thank You

Pratigya Sharma 6 years, 10 months ago

Coogulation take place

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What is the role of pyridine in the acylation reaction of amines?

Posted by Leena Gupta 6 years, 10 months ago

CBSE > Class 12 > Chemistry

1 answers

Anjali Kalange 6 years, 10 months ago

It is the acylation agent

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What is occlusion?

Posted by Leena Gupta 6 years, 10 months ago

CBSE > Class 12 > Chemistry

3 answers

A Jaiswal 6 years, 10 months ago

Ncert hi to h ☺

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Leena Gupta 6 years, 10 months ago

Is this in ncert??

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Sunita Tiwari 6 years, 10 months ago

Occulusion is the process of adsorption of gas on the surface of the metal.

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Significance of lattice point in a crystal?

Posted by Leena Gupta 6 years, 10 months ago

CBSE > Class 12 > Chemistry

0 answers

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NF3 is an exothermic compound but NCl3 is an endothermic compound.Explain

Posted by Leena Gupta 6 years, 10 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

What is the role of diffusion in heterogeneous catylsis?

Posted by Leena Gupta 6 years, 10 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

What is the role of heterogeneous catalysis?

Posted by Leena Gupta 6 years, 10 months ago

CBSE > Class 12 > Chemistry

1 answers

Harsh Shukla 6 years, 10 months ago

In heterogeneous catalysis the reactant diffuse to the catalyst and absorb on to it via the formation of chemical bond after reaction the products desorb from the surface and diffuse away.

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Conductivity of si increases on doping it with phosphorus ?

Posted by Pawan Tyagi 6 years, 10 months ago

CBSE > Class 12 > Chemistry

2 answers

Jayant Tehlan 6 years, 10 months ago

Phosphorus is pentavalent have 1 free electron for conduction

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Anjali Kalange 6 years, 10 months ago

When si is doped with a pentavalent element i.e., P , mobiles electrons are there which conduct electricity and hence increase the conductivity.

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Is solid state in 12 class sylbus or not

Posted by Param Rishi 6 years, 10 months ago

CBSE > Class 12 > Chemistry

2 answers

A Jaiswal 6 years, 10 months ago

1st chapter me wahi to h bs ☺

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Sangeeta Nara 6 years, 10 months ago

Yes

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Drug target

Posted by Suyash Tripathi 6 years, 10 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

Give an example miscelles system

Posted by Rajam 1969 6 years, 10 months ago

CBSE > Class 12 > Chemistry

1 answers

N Aaditya 6 years, 10 months ago

It is an associated colloid. Ex soap and detergents.

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Cottrell's smoke precipitator is fitted at the mouth of the chimney used in factories

Posted by Rajam 1969 6 years, 10 months ago

CBSE > Class 12 > Chemistry

1 answers

Guru Shankar 6 years, 10 months ago

Since the smoke from factories contain carbon which is positively charged when it enter the chamber fitted with negatively charged rod the carbon gets precipitate and only hot air is released out

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Ferric hydroxide sols gets coagulated on addition of sodium chloride solution

Posted by Rajam 1969 6 years, 10 months ago

CBSE > Class 12 > Chemistry

1 answers

N Aaditya 6 years, 10 months ago

Release of fe+3 from Fe(OH)3 and Cl-from NaCl and fecl3 gets coagulate.

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Physisorption is reversible while chemisorption is irreversible why?

Posted by Rajam 1969 6 years, 10 months ago

CBSE > Class 12 > Chemistry

1 answers

N Aaditya 6 years, 10 months ago

Physiosorption takes place by weak vanderwaal force of attraction between adsorbate and adsorbent while chemisorption takes place by strong covalent bond.

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What are the physical states of dispersed phase and dispersion medium of forth?

Posted by Rajam 1969 6 years, 10 months ago

CBSE > Class 12 > Chemistry