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1.arrange order of polarity(with logic)-NH3,PH3,AsH3,SbH3. 2.which of these has the strongest sigma bond-ethane/ethene/ethyne/benzene? ...
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some more simple doubts- 1)find maximum excess pressure inside a thin walled steel tube of radius R and thickness r(<< R) so that tube wont rupture(breaking stress of steel s) 2)a beaker containing water is rigidly fixe ...
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A bird sitting in a wire cage which is hanging from a spring balance.if bird starts flying inside the cage,reading of spring balance will remain unchanged/be less/more than earlier? ...
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why stability of metal fourides decreases down the group while that of other halides increases? ...
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CH3NHCH2CHO+CH3MgBr-> ? ...
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im having a very basic doubt regarding "oxidation state".how can nitrogen have +5 oxidation state when it does not have a d-orbital??is it neccessary to have n "unpaired" electrons to show +n ox. state?and how is its maximum ...
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why is a compound with paired electrons diamagnetic and unpaired paramagnetic? ...
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while doing a sum the emf of a battery in a circuit came out to be negative.surprisingly the answer was negative.how is it possible.how is the current flowing then?? ...
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1)a uniform circular loop is rotating clockwise in absence of gravity with tangential speed v0.if v be velocity of transverse waves travelling on the strin then v>v0/v<v0/v+v0?(wat is the meaning of the question?) 2) ...
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i had a wierd doubt..y is dsp2 square planar while sp3 is tetrahedral?? ...
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solid cube half immersed in water has time period of small vertical oscillation equal to p/5 s(p means pie).find mass of body.. ...
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√(1+1/12+1/22) + √(1+1/22+1/32) +....√(1+1/20072+1/20082) ...
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A body is floating in a vessel filled with liquid.now the vessel is heated.the buoyant force on the body incr/decr/remains same?? ...
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arrange in order of increasing reactivity of following monomers towards anionic polymerisation CH3CH=CH2,C6H5CH=CH2,CH2=CHCN?? ...
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well pls suggest sum gud book (other than o.p.tandon and maity ganguly) for inorganic.im horrible at it- 1)white ZnO on heating looses oxygen and becomes yellow due to defects in solid structure.no of defects increases or dec ...
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in a triangle,R=2r then the triangle is a)right angle b)isosceles c)equilateral d)none ...
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y=f(x) is a function on R->Q and continuous such that f(2)=3.then the function is even/odd/increasing/cant be said. ...
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[x] + [x+1/n] +[x+ 2/n] +........[x+ (n-1)/n]=[nx] is true a)for any real no x b)for any integer x c){x} is multiple of 1/n d)for no n. ...
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given g(f(x))=x.then f(x) is one-one/onto/both/one one but not necessarily onto ...
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i dnt wnt ans,sum1 pls explain me the capacitance when charged inner sphere(radius a) is earthed.charged outer sphere has radius b.cant derive it. ...
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On a sheet of paper the following statements are written- Exactly 1 statement in this sheet is false Exactly 2 statements in this sheet are false . . . . Exactly 100 statements in this sheet are false q)how many statements in ...
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i had a doubt regarding the mechanism of aldol say for example,of acetaldehyde.After OH- takes away an acidic hydrogen,the formed -CH2CHO attacks the C of C=O of another acetaldehyde mol but 1)isnt the reso structure of -CH2C ...
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i am presently in class XII and am taking the correspondence course.is there any online test or test in any centre in kolkata which i can give at edudigm? ...
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If m and n are any 2 odd positive integers with n<m then largest positive integer which divides all numbers of the form (m2-n2).(my ans is cumin 4 but it is given 8). ...
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in a book there is some formula if f(x+y)=f(x)+f(y) then f(x)=xf(1).how does this come?? ...
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im interested in studying aeronautical engineering.ive heard anna university is good but in their website i couldnt understand the admission procedure.could u pls help me out n suggest name of good institutes for studying it. ...
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why only Mg and Mn give H2 with cold n dil HNO3?? ...
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∫dx/(ax2+bx+c)2=? i heard sumthing called reduction formula.wat is it?do we need to know it? ...
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∫0∞xeaxdx(limits from 0 to ifinity) ...
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very simple ones bt im stuck.. 1.find minimum value of (a2+3a+1)(b2+3b+1)(c2+3c+1)/abc 2.x,y,z are +ve real no.s satisfy 4xy+6yz+8xz=9 find max value of xyz. ...
