CBSE > Class 11 > Chemistry | CBSE Board | Homework Help

Lithium is used in heat resistive ceramics and glasses.
Alloy of Lithium is used in aircraft building.
Sodium is used as luster in metals.
Liquid Sodium is used as coolant in Nuclear reactors.
Potassium chloride is essential for the growth of plants. It is used in fertilizers.
Potash improves water retention, yield, nutrient value, taste, color, texture and disease resistance of food crops.
Rubidium 82 is used in myocardial perfusion.
Rubidium is used in the manufacture of atomic clocks, electronic tubes, photocells.
Cesium-134 is used in nuclear power industry.
Cesium in photoelectric cells due to its quick electron emission.
Francium is mainly used for scientific research in laboratory. It decays quickly as it has short half life.

3Thank You

Priyanshu Rautela 7 years, 2 months ago

Like CH2 CH4 etc

1Thank You

ANSWER

Why are sigma bond is stronger than pi bond?

Posted by Ialammiki Lamare 7 years, 2 months ago

CBSE > Class 11 > Chemistry

2 answers

Yogita Ingle 7 years, 2 months ago

The strength of a bond depends on upon the extent of overlapping. A sigma bond stronger than a pi bond. The reason behind this is the orientation of the overlapped orbitals. Sigma bonds result from head-on(co-axial) overlapping while pi bonds are the outcome of lateral(para-axial) overlapping.
The greater the extent of overlapping, the higher the probability of finding the valence electrons in between the nuclei and hence the bond will be stronger.

2Thank You

Aditesh Singh 7 years, 2 months ago

Because in sigma bond overlapping is quite large as compaired to pi bond

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Arrange the bond order of increasing ionic character of the molecules -LiF K2O N2 So2 ClF3

Posted by Rohit Parmar 7 years, 2 months ago

CBSE > Class 11 > Chemistry

0 answers

ANSWER

Draw the energy level diagram of p pi bond between two different nitrogen atom involving p orbital.

Posted by Vedodai Rathod 7 years, 2 months ago

CBSE > Class 11 > Chemistry

0 answers

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a sample of Hi gas is placed in a flash at a pressure of 0.2 atmospheric pressure at equilibrium the partial pressure of gases is 0.04 atmospheric pressure what is KP for the given equilibrium 2HIgaseous reversible reaction H2 gaseous + I2 gases

Posted by Prashant Mishra 7 years, 2 months ago

CBSE > Class 11 > Chemistry

0 answers

ANSWER

3 bromo phenyl cyanide

Posted by Manas Chaudhary 7 years, 2 months ago

CBSE > Class 11 > Chemistry

0 answers

ANSWER

Why does along moving down the group the radius of the atom increases??

Posted by Harman Sidhu 7 years, 2 months ago

CBSE > Class 11 > Chemistry

3 answers

Neha Rastogi Neha Rastogi 7 years, 2 months ago

As we goes down the group the number of shell increases and because of increase of number of Shell the atomic radius increases.

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Priya Dharshini ☺☺ 7 years, 2 months ago

The number of energy levels increases as you move down a group as the number of electrons increases. Each subsequent energy level is further from the nucleus than the last. Therefore, the atomic radius increases as the group and energy levels increase.

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Anurag Mishra 7 years, 2 months ago

Because the number of shells increases.

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ANSWER

How to convert acetaldehyde to formic acid?

Posted by Mukti Subedi 7 years, 2 months ago

CBSE > Class 11 > Chemistry

0 answers

ANSWER

Three molecules ofgas have speed of 2 metre second 4m second 6 metre second is respectivly the root mean square velocity at that temperature is

Posted by Sahil Sharma 7 years, 2 months ago

CBSE > Class 11 > Chemistry

0 answers

ANSWER

Cal w,q and ∆U when 2 mole of ideal gas expands isothermally and reversibly at 273 k for a volume of 10 litre to 20 litre

Posted by Anchu Khurana 7 years, 2 months ago

CBSE > Class 11 > Chemistry

0 answers

ANSWER

Iron carbon diagrams

Posted by Ameesha Prabhakaran 7 years, 2 months ago

CBSE > Class 11 > Chemistry

0 answers

ANSWER

Difference between ionization energy and electron gain enthalpy

Posted by D Dalton 7 years, 2 months ago

CBSE > Class 11 > Chemistry

1 answers

Rudransh Kalia 7 years, 2 months ago

Ionisation energy is the amount of energy required to gain the electron in the isolated state of the element. Electron gain enthalpy is energy released during the loss of electron in it's isolated State of atom

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Anyone please explain POLYBASIC ACIDS and POLYACIDIC BASES???

Posted by Misba K M 7 years, 2 months ago

CBSE > Class 11 > Chemistry

0 answers

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Can anyone tell me how to start prep for jee mains after halfyearly of class 11.......? Am confused...... Im nt gettin gud marks in 11th.....!!!

Posted by Rohit Kumar 7 years, 2 months ago

CBSE > Class 11 > Chemistry

2 answers

Ritu Thapliyal 7 years, 2 months ago

I think u don't have to take tension about ur marks !!! u just do as best as u can from your side bcz teachers do vry hard checking in 11th exam!!! U have one year more for jee mains so don't take tension bcz u can't do anything if u do so!!!! keep doing hard work also!!!

2Thank You

Nancy Rajput 7 years, 2 months ago

no start from now

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ANSWER

Draw the picture and write their name for any 6 alicyclic compounds

Posted by Ramanan 1313 7 years, 2 months ago

CBSE > Class 11 > Chemistry

0 answers

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Are you see the chemistry of all elements

Posted by Abhishek Kumar 5 years, 9 months ago

CBSE > Class 11 > Chemistry

0 answers

ANSWER

Why Be is larger than B

Posted by Abhay Dixit 7 years, 2 months ago

CBSE > Class 11 > Chemistry

1 answers

Pushkar Kumar Das 7 years, 2 months ago

Size of Be is larger than B bcoz B has more no. Of atoms in his shell as compared to Be ,Therefore,it has more charges in its nucleus and orbits which attracts each other due to which, size of B decreases .

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ANSWER

When zinc hydroxide react with sodium what product are formed

Posted by Rites Singh Rajput 7 years, 2 months ago

CBSE > Class 11 > Chemistry