Table of Contents
Charging of Insulators
Since charge cannot flow through insulators, neither conduction nor induction can be used to charge, insulators, so in order to charge an insulator friction is used. Whenever an insulator is rubbed against a body exchange of electrons takes place between the two. This results in appearance of equal and opposite charges on the insulator and the other body. Thus the insulator is charged.
For example rubbing of plastic with fur, silk with glass causes charging of these things.
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Reynolds Number
Last modified on:3 years agoReading Time:10MinutesWhat is Reynolds Number? The Reynolds number (Re) is a dimensionless parameter used in fluid mechanics to characterize the flow of a fluid (liquid or gas) around an object or through a conduit. It relates the inertial forces to the viscous forces in the fluid and helps determine the type of…
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Class 11 Chemistry Ch-9 Hydrogen (VSQ)
Last modified on:5 years agoReading Time:10MinutesQ.1. Why is 2-ethylanthraquinone preferred in the commercial production of H2O2? Answer Answer: It gets regenerated during the reaction by hydrogenation of 2–ethylanthrahydroquinone. Q.2. Which would have higher electrical conductivity H2O or D2O? Answer Answer: Water due its greater degree of dissociation (pKH2O = 13.997 pKD2O = 14.869) . Q.3. Give…
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Class 11 Chemistry Ch-10 The s-Block Elements (VSQ)
Last modified on:5 years agoReading Time:10MinutesQ.1. Why does a piece of burning magnesium ribbon continues to burn in sulphur dioxide ? Answer Answer: This is because magnesium has high affinity to combine with oxygen of SO2 to form MgO and S. 2Mg + SO2 → 2MgO + S Q.2. What is the function of adding gypsum…
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Class 11 Chemistry Ch-11 The p-Block Elements (VSQ)
Last modified on:5 years agoReading Time:10MinutesQ.1. Name the element of group 13 which forms only covalent compounds. Answer Answer: B forms only covalent compounds. Q.2. Explain why silicon shows a higher covalency than carbon? Answer Answer: Si because of the presence of vacant d–orbitals can show a covalency upto six while C because of the absence…
