Frequently Asked Questions by Members

Showing All Questions asked by Members

• The gas kinetic temperature in the upper atmosphere is much higher than than on the earth but even then it is quite cold there. Why?
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• How many litres of oxygen at STP are required for the combustion of 4g of CH₄ gas. calculate the volume of CO₂ produced at STP.
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• Find out the mole fraction of NaOH solution containing 4g of solute in 90g of water.
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• Find the total numbers of selections of atleast one red ball from 4red ball and 3 green balls if the balls of the same colour are different.
  
  ans--120
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• A 600ml vessel containing O₂ at 200ml at 800mm and a 400ml vessel containing N₂ at 600mm at the same temperature are joined together. the final pressure is
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• the no of oxygen atoms present in 2 moles of a compound, which consists of a bivalent metal and a pechlorate ion
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• Which of the following is a protic solvent 1) DMSO
  2) DMSO
  3) DMF
  4) MeOH
  5) HMPT
  
  (Please state the reason.)
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• What is the role of RCOOOH in organic rxns.?
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• 20cc of a hydrocarbon on complete combustion gave 80cc of CO₂ 100cc of H₂O The empirical formula of that compound is 
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• Calculate the mass of AL₂O₃ which contains double the number of oxygen atoms in 192g of oxygen gas
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• when one mole of CO and O₂ are made to react at STP, the total no. of moles at the end of the reaction is
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• What is the volume of 50% (w/v) H₂SO₄ required for the liberation of 5.6l of hydrogen gas at STP on its reaction with magnesium.
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• why the boiling point of 1-2-dichlorobenzene is greater than 1-4- OR 1-3-dichlorobenzene? any explanation.
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• sir how to decide aromaticity in the case of multiple ring system?like in case of more then one benzene ring.
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• what is standard electrode potential? 
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• [Cu(NH₃)₄]²⁺ tends to be octahedral????? but its co ordination number is just 4
  
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• what is "cryosurgery"?
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• ethyne has a triple bond.so CCtriple bond is strong so it has two acidic hydrogen.Am i right ??
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• sodium salts of carboxylic acid on decarboxylation gives alkane.
  What are the other compounds that on decarboxylation yield alkane?
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• how to find the molecular weight by combustion method?
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