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CBSE Class 11 Science Free Doubts and Solutions

CBSE - XI Science - Chemistry

H2S + KMnO4 + H2SO4 → S+ MnSO4 + KHSO4 + H2O  Balance by oxidation number method step by step explain please

Asked by govtsecschoolnayaganv051 18th August 2018, 5:08 PM
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CBSE - XI Science - Chemistry

0.4g and 0.75g of two samples of the oxide of nickel were found to contain 0.32g and 0.6g of the metel respectively. Show that these results verify the law of definite proportion.

Asked by sourabmkalliyan 17th August 2018, 4:54 PM
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CBSE - XI Science - Mathematics

Prove that the radio of the circles x^2 + y^2=1,x^2 + y^2 - 2x-6y-6=0 and x^2 + y^2-4x-12y-9=0 are in AP.

Asked by dineshchem108 12th August 2018, 6:27 PM
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CBSE - XI Science - Physics

An aeroplane is flying horizontally at a height of 980 m with velocity 100ms-1 drops a food packet . Aperson on the ground is 414m ahead horizontally from the dropping  point. At what velocity should he move so that he can  catch the food packet

Asked by valavanvino1011 12th August 2018, 5:58 PM
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CBSE - XI Science - Mathematics

  9x+2  = 240 + 9x  solve for x

Asked by anujguptaaj11 11th August 2018, 4:02 PM
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CBSE - XI Science - Mathematics

Find integration.

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Asked by dineshchem108 10th August 2018, 9:49 PM
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CBSE - XI Science - Mathematics

If x=2 ln cot t and y=tan t + cot t, find dy/dx.

Asked by dineshchem108 10th August 2018, 9:23 PM
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CBSE - XI Science - Physics

An electron in the hydrogen atom jumps from excited state n to the ground state.The wavelength so emitted illuminates a photo-sensitive material having work function 2.75eV.If the stopping potential of the photoelectron is 10V, the value of n is 

Asked by aiswaryapbindhu3 8th August 2018, 11:40 PM
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CBSE - XI Science - Physics

A galvanometer coil of resistance 50 ohm shows full deflection at 10 micro ampere.Resistance to be added,for the galvanometer to work as an ammeter of range 10 mega ampere is 

Asked by aiswaryapbindhu3 8th August 2018, 11:35 PM
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CBSE - XI Science - Mathematics

lim x^1/6 - 2 / x^1/3 - 4 x→64  

Asked by dineshchem108 8th August 2018, 7:00 PM
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