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Physics: Post your doubts here!
i already solved these questions some important points the nucleus is initally at rest so its momentum is zero mass of neutron is equal to proton( mass of electrons is negligible lets consider the mass of neutron or proton equal to n A is neuclon number which is number of protons+neutrons total... -
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Guyzz lotzz of Chemistry doubtzz plzz take a loke if u can help
for q6 cracking is breaking the bigger molecules into smaller molecules if u see the Octene has 8 C atoms so we should get exactly 8C only B seems to be correct. for q8 2 moles of HI GIVES 1 mole of I2 and H2 respectively x number of moles HI wil give x/2 moles of these products 2HI(g) H2(g)... -
Guyzz lotzz of Chemistry doubtzz plzz take a loke if u can help
for q5 dipole is electrons in the bond spending more time around one atom than the other. this is due to electronegitivty differences so lets see which is most polar . bear in mind that methyl and h atoms are not much electronegative . O is one of the most electronegative element. A and D are... -
Guyzz lotzz of Chemistry doubtzz plzz take a loke if u can help
for q 4 the greater the interaction(or attraction) between molecules the more the gas deviates from ideal behavior as the temperature is constant so the gas cant liquify the answer is D please do tell me if this is the case -
Guyzz lotzz of Chemistry doubtzz plzz take a loke if u can help
for qno3 any substance that undergoes a change in oxidation number is basically undergoing redox reaciton . NaOcl is a bleaching solution that u have to know its in coursebook since the final product has an halogen so it would give a ppt with silver nitrate A is the answer -
Guyzz lotzz of Chemistry doubtzz plzz take a loke if u can help
for pic 2 mole fraction= number of moles of a product/totalnumber of moles of products so given this if ethene is 0.5 it means ethene is 50% of the total products so the remaining two are 25% and 25% respectively convert these so that we have the whole numbers(0.5*4 )=2 moles of ethene... -
Guyzz lotzz of Chemistry doubtzz plzz take a loke if u can help
for pic 1 lets consider the number of moles for 1 mole of aluminium compound 72/24 gives 3 moles of number of moles of carbon should be 3 now come to aluminium balance the oxidation number of both elements so that net charge is 0 (3*x)+(4*3)=0 oxidation number of Al is +3 -
Chemistry: Post your doubts here!
for q35 redox reaction mean a chemical reaction in which the oxidation state of the element changes here N is reduced. NaOcl is a bleaching solution that u have to study in group 7 halogens nacl has an halogen that reacts with silver nitrate so A is the answer -
Chemistry: Post your doubts here!
we dont know the reactions of D will be same as that of H(hydrogen ) as the number of electrons and protons is still the same so lets consider NH4cl+Cao u do know that it will form CaO(s) + 2 NH4Cl(s) 2 NH3(g) + H2O(g) + CaCl2(s) D is no exception here so 1 is correct for option 2 we know that... -
Chemistry: Post your doubts here!
for q22 a free radical ? well it would be one less hydrogen atom right ? rule 1 take hydrogen from primary carbon atoms only as the secondary ones are stable very much stable than primary ones u can take an hydrogen from ethyl group from 3 methyl groups so it would be 4 but the answer says 3... -
Chemistry: Post your doubts here!
for A and D we use platinium for C we use Iron but for B we use vanadium oxide rather than vanadium so hope this answers ur question -
Chemistry: Post your doubts here!
i thnk the answer is D W should be magnesium oxide which is used as a refractory lining the furnace. and X can be Calcium carbonate which when heated decomposes to Calcium oxide which then hydrated gives calcium hydroxide. calcium hydroxide is an alkali and cant decrease the ph of soil (all... -
O/A Level Economics book
amazon sir cant we buy these from an local store in pakistan actually for amazon most of us dont have credit cards -
Physics: Post your doubts here!
23- B Max speed = 2pi *a *f f = ? s = f* lamda 8 = f (50) 0.16 Hz = f Max speed = 2pi * 2 * 0.16 =2 m/s Max K.E. = .5 m* v^2 = 0.5 * 2 * 10^-3 * 2^2 = 4 mJ -
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Chemistry: Post your doubts here!
actually u might know water is amphoteric oxide and sulfuric acid is an acid this settles it i think u might be confused with 3 ammonia is base as it accepts protons however ammonium ion nh4+ cant accept any protons rather it will donate protons behaving as an acid. u can also sum it up like... -
Chemistry: Post your doubts here!
these quations are given in data booklet so no need to memorize it Sn2+⇌ Sn4++ 2e- equation 1 (MnO4–)+ (8H+)+ 5e– ⇌ (Mn2+)+ 4H2O) equation 2 balance the number of electrons so that each equation have same number of electrons multiply equation 1 by 5 and equation 2 by 5 and then add these...