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Search results
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Chemistry MCQ thread...
i think so .. their just mixed up in the paper .. -
Chemistry MCQ thread...
yes. from the first equation we can see that if we have 1 mole NaN3 we get 1.5 moles N2 and from the second equation we can see that 10 moles of Na will give 1 mole of N2 BUT we have only 1 mole of Na(because we only had 1 mole NaN3 and it gives 1 mole Na , u can check from the first eq) ... -
Chemistry MCQ thread...
the pluger is stationary so the pressure from both inside and from the atmosphere is equal on the plunger .. so 1 is incorrect .. when 1 is incorrect in only leaves C as the option :D -
Chemistry MCQ thread...
40 is D because in 1 it has a tertirary compound which makes causes the reaction to go through the Sn1 mechanism .. the Sn1 mechanism has two stages in the reaction and we can see from the diagram that it has two stages .. all other equations go through a single stage .. -
Chemistry MCQ thread...
18's D .. the colour is purple of gaseous bromine . -
Chemistry MCQ thread...
the main thing is to check for the limiting reagent .. rest is just simple mole calculations .. hope u understand -
Chemistry MCQ thread...
u have the mass of ethanol and ethanoic acid so first of all u calculate the moles of both of them and see which one of them is in limiting .. ethanoic acid is limiting and has o.5 moles . from the mole ratio we can see that the ester would also hav 0.5 moles .. and then multiply 0.5 by the Mr... -
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Chemistry MCQ thread...
i explained above .. one would be of the isotope of Cl35 , one would be of the isotope of Cl37 , and the third would be of the molecule Cl35.5 -
Chemistry MCQ thread...
yep 3 peaks . one of Cl35 one of Cl37 and one of their averaged molecule Cl35.5 -
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Chemistry MCQ thread...
but i wont call it 'hard' . lets call it a tricky question .. -
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Chemistry MCQ thread...
q4 is easy too.u just form a equation and compare their volume ratios to find the total volume .. it would be only of CO2 and the add the volume of excess oxygen in it .. -
Chemistry MCQ thread...
its not that hard .. for q8 answer is D because for the enthalpy change of formation the product must be formed from its elements in their standard states .. in other options the reactants have compounds .. but only D has all its reactants as elements in their standard states .. -
Chemistry MCQ thread...
NaOH will dissolve both CO2 and SO2 .. so the final would be 20cm3 -
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Chemistry MCQ thread...
@wahab no gas is poisonous .. and the question is for flamable gases .. so only one is non flamable and others are flamable .. -
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Chemistry Paper 1 Doubts!
@sweetiepie ur right .. i did it earlier but couldnt understand it now ..but thanks ..