Subject :NSO Class : Class 10
actually water is neutral. IRRESPECTIVE of volume ,it will contain equal no. of negative and positive charges.
according to your que., you have 0.3L of water. assume that you have 36g of water(since the weight is not mentioned).Then calculate total moles of it(=2 moles).THEN ,calculate total moles of (H+) IONS i.e, +charge[=4 moles].Then,4*6.022*10power23. finally,total no. of +charge=24.088*10power23.
I hope this will help you.
Subject :NSO Class : Class 5
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Subject :NSO Class : Class 6
Study the flow chart carefully.
Which of the following is correct ?
| P | Q |
|---|---|
| (A) Reversible change | Reversible change |
| (B) Irreversible change | Reversible change |
| (C) Irreversible change | Irreversible change |
| (D) Reversible change | Irreversible change. |
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Subject :NSO Class : Class 9
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Subject :NSO Class : Class 5
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Subject :NSO Class : Class 7
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Subject :NSO Class : Class 2
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Subject :NSO Class : Class 7
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Subject :NSO Class : Class 4
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Subject :NSO Class : Class 2
A mass of 100 g strikes the wall with speed 5 m/s at an angle as
shown in figure and it rebounds with the same speed. If the contact time is 2 x 10-3 sec, what is the force applied by the wall ?


Your mother goes to buy a woollen shawl from the market. The shopkeeper takes
out a small strand of yarn from the shawl and burns it. It smells like a burning plastic.
Will it be a good decision to buy this shawl and why?
Which of these statements is true for a cat and a giraffe ?