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CBSE Free Doubts and Solutions

CBSE - XI Science - Chemistry

6.02 * 10ki power 20 molecules of urea are presentin 100ml of solution the concentration of urea solution is 

Asked by puneetgarg2555 22nd May 2018, 7:16 AM
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CBSE - XI Science - Chemistry

12.5g of fumming H2SO4 (labeled 112+) is mixed with 100 litre water calculate mole concentration of h+ in resultant solution

Asked by puneetgarg2555 22nd May 2018, 7:10 AM
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CBSE - XII Science - Physics

Can you suggest way to approach a tricky question in physics like that from laws of motion or from fluids ?

Asked by minipkda 22nd May 2018, 6:44 AM
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CBSE - XII Science - Chemistry

Sir, Can you give all the important equations in p and s  block elements ?  

Asked by minipkda 22nd May 2018, 6:42 AM
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CBSE - XII Science - Chemistry

Corrosion is nessesarily a chemical reaction where what all changes occur and its cell reaction is...  

Asked by minipkda 22nd May 2018, 6:04 AM
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CBSE - XII Science - Physics

sir please answer

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Asked by minipkda 22nd May 2018, 4:51 AM
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CBSE - XII Science - Physics

sir please answer

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Asked by minipkda 22nd May 2018, 4:50 AM
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CBSE - XII Science - Physics

Assertion :- The cloud in sky generally appears to be whitish. Reason :- Diffraction due to clouds is efficient in equal measure at all wavelengths.

Asked by minipkda 22nd May 2018, 4:46 AM
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CBSE - XII Science - Chemistry

Assertion :- NCl3 and Mg3N2 both on hydrolysis produce same colourless basic gas. Reason :- During hydrolysis, the nucleohile OH– will always attack on the central atom.

Asked by minipkda 21st May 2018, 10:45 PM
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CBSE - XII Science - Biology

Assertion :- In sun-flower family petals are modified in to pappus. Reason :- Pappus helps in dispersal of flower.

Asked by minipkda 21st May 2018, 10:40 PM
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