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Shivam Pandit 7 years, 6 months ago

The reason for spherical Shape of the earth is phenomenon of surface tension

Aviral Upadhyay 7 years, 6 months ago

On Earth mass is unevenly distributed.so where the concentration of mass is more the gravitationsl pull is more on that region creating bumps .There is many more explanations for the spheroid shape of earth.

ANSWER

Which type of crystalline solid is carbon disulfide with reasons

Posted by Abd Fan 7 years, 6 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

What are network solid

Posted by Kuldeep ?? 7 years, 6 months ago

CBSE > Class 12 > Chemistry

2 answers

Vaibhav Gupta 7 years, 6 months ago

Large interconnected molecules formed by catinable atoms like C,Si are called network solids ex- diamond ,graphite ,yellow sulphur

Saloni S 7 years, 6 months ago

covalent solids known as network solids

ANSWER

what is haloalkane? difine.

Posted by Sunaina Sharma 7 years, 6 months ago

CBSE > Class 12 > Chemistry

1 answers

Mukesh Gupta 7 years, 6 months ago

Those Alkanes are joined with halogen group

ANSWER

How would you determine the standard electrode potential of the system Mg2+1 Mg

Posted by Jairaj Singh 7 years, 6 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

why zinc oxide becomes yellow on heating?

Posted by Jatin Singh 7 years, 6 months ago

CBSE > Class 12 > Chemistry

2 answers

Rashid Khan 7 years, 6 months ago

When we heat zinc oxide then oxygen atom gets removed and at that place of oxygen an electron comes to maintain electrical neutrality and this electron gives/impart yellow colour to the zinc oxide

H!Mαη$Hμ Ұαδαυ ✔️ 7 years, 6 months ago

Due to F centred defect

ANSWER

Why NH3 can not be written an H3N and H2O as OH2 ?

Posted by Gud Luck ? 7 years, 6 months ago

CBSE > Class 12 > Chemistry

3 answers

Rishabh Sahu 7 years, 6 months ago

Innionic molecules cation is always written before anion . Whereas in covalent molecules this is usually not followe and names written according to bonding pattern.

Mukesh Gupta 7 years, 6 months ago

Because anion always written after cation

H!Mαη$Hμ Ұαδαυ ✔️ 7 years, 6 months ago

Good question...

ANSWER

Which case of molality is equal to molarity ?

Posted by Rahul Singh 7 years, 6 months ago

CBSE > Class 12 > Chemistry

1 answers

H!Mαη$Hμ Ұαδαυ ✔️ 7 years, 6 months ago

In case of dilute solution...as density of water is one so 1kg of water will have 1litre volume and for dilute solution volume of soltion≈volume of water(solvent) then molarity is equal to molality

ANSWER

Solid depends upon ????? 1. High temperature 2. Low temperature 3. Pressure 4. None of these

Posted by Rahul Singh 7 years, 6 months ago

CBSE > Class 12 > Chemistry

3 answers

Sarah Sharma 7 years, 6 months ago

High temperature

Mukesh Gupta 7 years, 6 months ago

Solid depends on low temperature because at high temp. Solid become liquid

Gud Luck ? 7 years, 6 months ago

High Temperature

ANSWER

What do you means the term solid

Posted by Anurag Yadav 7 years, 6 months ago

CBSE > Class 12 > Chemistry

2 answers

Rahul Singh 7 years, 6 months ago

Those substance which have melting point greater than room Temperature is called solid

Anubhi Chauhan 7 years, 6 months ago

Solids are those which are hard and rigid and whose particles are closely packed.

ANSWER

What is the effect of ph ,when electrolysis of conc.aqueous nacl suing platinum electrode

Posted by Rashi Singh 7 years, 6 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

Is the given notes are sufficient of the course

Posted by Aman Rao 7 years, 6 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

Actually my daughter failed in her 12std 2018 in chemistry like over all she passed but she failed in THEORY CAN SHE APPEAR DIRECTLY FOR IMPROVEMENT IN 2019

Posted by Lakshmi Prasanna B 7 years, 6 months ago

CBSE > Class 12 > Chemistry

3 answers

Sarah Sharma 7 years, 6 months ago

Discuss with the school

Rahul Chauhan 7 years, 6 months ago

U should discuss with her school quickly

Rahul Chauhan 7 years, 6 months ago

No compartment is available for her

ANSWER

How can colloidal solution and true solutions of same colour be distinguished?

Posted by Abhishek Kumar 7 years, 6 months ago

CBSE > Class 12 > Chemistry

1 answers

Anubhi Chauhan 7 years, 6 months ago

Colloidal solution are translucent while true solutions are transparent. Colloidal sol scattered the beam of light while passing through it(tyndal effect).

ANSWER

Name the heterogeneous catalyst involved in the polymerization of ethylene

Posted by Abhishek Kumar 7 years, 6 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

What happens when gelatin is added to gold Sol?

Posted by Abhishek Kumar 7 years, 6 months ago

CBSE > Class 12 > Chemistry

1 answers

Anubhi Chauhan 7 years, 6 months ago

As gold Sol is lyophobic..... On adding gelatin it starts behaving as a lyophillic sol because gelatin acts as a protective colloide.

ANSWER

Why lyophillic solution cannot be easily coagulated?

Posted by Abhishek Kumar 7 years, 6 months ago

CBSE > Class 12 > Chemistry

2 answers

Anubhi Chauhan 7 years, 6 months ago

Colloidal sol

Anubhi Chauhan 7 years, 6 months ago

Because there particle size is between 1nm-1000nm. On adding to a solution they directly form colloidal silver.

ANSWER

10 important definition of kinematics

Posted by Himanshu Himanshu 7 years, 6 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

Full solution of daniell cell

Posted by Navkash Panwar 7 years, 6 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

How can we find the numbers of electrons, protons & neutrons of any compounds

Posted by Sandip Kumar 7 years, 6 months ago

CBSE > Class 12 > Chemistry

1 answers

Himanshu Himanshu 5 years, 8 months ago

Electron = proton =atomic number Neutron = atomic mass - atomic number

ANSWER

Why does hydrogen gas produce pop sound on burning?

Posted by Sohan Lal Bairwa 7 years, 6 months ago

CBSE > Class 12 > Chemistry

1 answers

Deepak Sangwan 7 years, 6 months ago

The pop sound comes from the small explosion formed by burning of hydrogen with oxygen

ANSWER

Arrange the following in increasing order of size Flourine- , lithium+ , sodium+ , chlorine- .

Posted by Sahil Yadav 7 years, 6 months ago

CBSE > Class 12 > Chemistry

1 answers

Pnp Jain 7 years, 6 months ago

Smallest size is that of Li+, followed by F-. Na and Cl :both lie in third period and Na has larger size than Cl, but when we talk about ions, then Na+ is smaller than Cl-. This is because of inter electronic repulsion in Cl- and increase in effective nuclear charge in Na+.

ANSWER

Convert propene ro propyne

Posted by Amir Suhail 7 years, 6 months ago

CBSE > Class 12 > Chemistry

1 answers

Amir Suhail 7 years, 6 months ago

R÷q=Rr

ANSWER

Name the element which has no electrons in s subshell

Posted by Shivam Pandit 7 years, 6 months ago

CBSE > Class 12 > Chemistry

1 answers

Ujjwal Bhanwra 7 years, 6 months ago

H+

ANSWER

Why phenol not react with mixture of nabr and h2so4

Posted by Aakash Jaiswal 7 years, 6 months ago

CBSE > Class 12 > Chemistry

0 answers

ANSWER

A reaction is 50% complete in 2 hours and 75% complete in 4 hours. What is the order of the reaction?

Posted by Nancy Khatri 7 years, 6 months ago

CBSE > Class 12 > Chemistry

1 answers

Aviral Upadhyay 7 years, 6 months ago

First order reaction

ANSWER

Why windows of old buildings get thinner from top and thicker from bottom

Posted by Krishan Kumar 7 years, 6 months ago

CBSE > Class 12 > Chemistry

2 answers

Sahil Bhai Patre 7 years, 6 months ago

Because they are pseudosolids or super cooled liquid. They have tendency to flow very slowly so when sunlight pass it get melted.

Krishan Kumar 7 years, 6 months ago

Because window pane get melted due to the fall of sunlight on them

ANSWER

What is tetrahedral

Posted by Shail Nandnee 7 years, 6 months ago

CBSE > Class 12 > Chemistry

1 answers

Rishabh Sahu 7 years, 6 months ago

It is a 3d shape . In chemistry it may refer to chemical bonding . Tetrahedral geometry means all bonds are symmetric w.r.t. each other eg in CH4 . If you are able to view a molecular bond towards you then you rotate it by 109° to move the other bond towards you the orientation of the bonds still look the same in both cases having same symmetry . Ncert class 11 book has a good diagram on it in chemical bonding chapter. Though viewing a tetrahedron on the internet will give a clearer view on it.