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A substance which alters the rate of a chemical reaction without itself undergoing any changes in mass and chemical composition at the end of reaction

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What is meant by term packing efficiency?

Posted by Nuri Rizwan 7 years, 9 months ago

CBSE > Class 12 > Chemistry

2 answers

Neha Gupta 7 years, 9 months ago

It is the % of total space filled by the particles

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Dev Gujjar 7 years, 9 months ago

It is a % of volume occupied by particle in unit cell by to volume of unit cell

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Which would undergo SN2 reaction faster in the following pairs. CH3-CH-CH2-CH2-Br and CH3-CH2-CH-CH2-Br | | CH3 CH3

Posted by Rishab Singh Kushwah 7 years, 9 months ago

CBSE > Class 12 > Chemistry

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The ions of NaF and MgO all have same no of es & internuclear distances are about the same then why are the melting points of NaF and MgO are different?

Posted by Shaily Singh 7 years, 9 months ago

CBSE > Class 12 > Chemistry

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What is isotopes

Posted by Priyanshu Gupta Gupta 7 years, 9 months ago

CBSE > Class 12 > Chemistry

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Puneeth Asha Rani V 7 years, 9 months ago

It is defined as the element which has same atomic number but different mass number

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What is a crystalline solid

Posted by Priyanshu Gupta Gupta 7 years, 9 months ago

CBSE > Class 12 > Chemistry

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Ankur And Akash Talukder 7 years, 9 months ago

A Crystalline solid usually consists of a large no.of small crystal each of them having definite geometric shape.For Eg -NaCl ,quarty ,e.t.c.

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Shaily Singh 7 years, 9 months ago

A crystalline solid is that solid in which the particles (atoms, ions) have a regular arrangement

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Organic chemistry of class 12-which chapters will be complicated!??????????↖:-)

Posted by Swetha Sri 7 years, 9 months ago

CBSE > Class 12 > Chemistry

1 answers

Namamee Shukla 7 years, 9 months ago

Complicated to nhi haan par aldehyde and ketone......vaala chapter jyada bada hai aur jyada weightage bhi hai uski......All the best for your 12th

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Why for most of the reactions they are only using pt\pd\or Ni as a catalysts not the any other one mostly.....

Posted by Swetha Sri 7 years, 9 months ago

CBSE > Class 12 > Chemistry

2 answers

Swetha Sri 7 years, 9 months ago

Y only this elements has high surface energy

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Anmol Panwar 7 years, 9 months ago

Bcz they are good adsorbent and provide surface for rxn easily bcz they emit high surface energy

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Difference between Sn1 & Sn2 reactions

Posted by Harshitha Ts 4 years, 6 months ago

CBSE > Class 12 > Chemistry

1 answers

Sia ? 4 years, 6 months ago

Sn1	Sn2
Sn1 is a unimolecular reaction	Sn2 is a bimolecular reaction
It follows a 1st order kinetic mechanism.	It follows the 2nd order Kinetic mechanism.
Sn1 involves two steps	Sn2 is a single-step process
In Sn1, the rate of reaction depends on the concentration of the substrate.	In Sn2, the rate of reaction depends on the concentration of both the substrate and the nucleophile.
In Sn1 as the leaving group leaves, the substrate forms a carbocation intermediate.	In Sn2, the reaction happens in a single transition state.
Optically active substrate becomes optically inactive and half of the optically active substrate becomes similar.	Sn2 involves inversion reaction.

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An aqeuos solution of 2℅w/w non volatile solute exert presure of 1.004 bar at normal b.p. of solvent. What is molecular mass of solute???

Posted by Aaryan Singh 7 years, 9 months ago

CBSE > Class 12 > Chemistry

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What is relloet law?

Posted by Rishi Pahariya 7 years, 9 months ago

CBSE > Class 12 > Chemistry

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The total number of particles in a body centred cubic (bcc) unit cell is

Posted by Anilchouhan Anilchouhan 7 years, 9 months ago

CBSE > Class 12 > Chemistry

1 answers

Anita Verma 7 years, 9 months ago

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What is osmosis?

Posted by Rishi Pahariya 7 years, 9 months ago

CBSE > Class 12 > Chemistry

2 answers

Preeti Chahar 7 years, 9 months ago

Spontaneous flow of solvent molecules from less conc. To more conc. Solution through semipermeable membrane

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Shreyas Trivedi 7 years, 9 months ago

The flow of solvent over to the part of solution which has less concentration to heigh concentration through a semi permeable membrane. To attain equilibrium of concentration on both sides

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Kannizaro reaction

Posted by Priya Siwach 7 years, 9 months ago

CBSE > Class 12 > Chemistry