Autogamous pollination takes place in
(A) Geitonogamy
(B) Xenogamy
(C) Cleistogamy
(D) Chasmogamy
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Photoelectric effect takes place in element A. Its work funcation is `2.5 eV` and threshold wavelength is `lambda`. An other element B is having work
Correct Answer - A `(phi_(1))/(phi_(2)) = (lambda_(2))/(lambda_(1))`
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What takes place when zinc metal is added to an aqueous solution containing magnesium nitrate and silver nitrate ? 1. Zn is oxidised 2. `Mg^(2+)` is r
Correct Answer - B No reaction takes place
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A reaction takes place in three steps with individual rate constant and activation energy, `{:(,"Rate constant","Activation energy"),("Step 1",k_(1),E
Correct Answer - A `Ae^(-E_(a)//RT)=[(Ae^(-E_(a_(1))//RT)xxAe^(-E_(a_(2))//RT))/(Ae^(-E_(a_(3))//RT))]^(2//3)` `=[Ae^((-E_(a_(1))-E_(a_(2))+E_(a_(3)))//RT)]^(2//3)` `E_(a)=(2)/(3)[E_(a_(1))+E_(a_(2))-E_(a_(3))]` `=(2)/(3)[180+80-50]=140 ` kJ/mol
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In the 28 days human ovarian cycle, the ovulation takes place typically on
Correct Answer - C (c) The first phase (proliferative phase) of menstrual cycle ends on `14^(th)` day, the ovarian follocles rupture and ovulation occurs.
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(i) Takes place in the early years of life.
(i) Socialization (ii) Internet
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In an economy with every increase in income 15% of the increased income is saved. Suppose a fresh investment of 600 crore takes place in the economy,
4000 crore, 3400 crore
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A boat moves along the flow of river between two fixed points A and B. it takes `t_(1)` time when going downstream and takes `t_(2)` time when going u
`t_(1)=(AB)/(v_(b)+v_(R)) . T_(2)=(AB)/(v_(b)-v_(R))` or `v_(b)+v_(R)=(AB)/(t_(1))` and `v_(b)-v_(R)=(AB)/(t_(2))rArr 2v_(b)=(AB)/(t_(1)+(AB)/(t_(2)))=AB((t_(1)+t_(2))/(t_(1)t_(2)))` or `((2t_(1)t_(2))/(t_(1)+t_(2)))=(AB)/(v_(b))`= time taken by the boat to cover AB
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When ethyne is passed through a red hot tube, then formation of benzene takes place: `H_(f(C_(2)H_(2))(g))^(@)=230kJ" "mol^(-1)` `DeltaH_(f(C_(6)H_(6)
Correct Answer - C `DeltaH_("reaction")=DeltaH_(f(C_(6)H_(6)))^(@)-3DeltaH_(f(C_(2)H_(2)))^(@)` `=85-3(230)` `=-605kJ" "mol^(-1)`.
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Calculate the standard cell potential of the galvanic cell in which the following reaction takes place: `2Cr(s)+3Cd^(2+)(aq)to2Cr^(3+)(aq)+3Cd(s)` Als
`E_(cell)^(ɵ)=E_(Cd^(2+)//Cd)^(@)-E_(Cr^(3-)//Cr)^(@)` `=-0.40-(-0.74)` `=-0.40+0.74=+0.34V` the half cell reaction are `2Cr(s)to2Cr^(3+)+6e^(-)` `underline(3Cd^(2+)+6e^(-)to3Cd(s))` `underline(2Cr(s)+3Cd^(2+)to2Cr^(3+)+3Cd(s))` `therefore` No. of electrons `n=6` `triangle_(r)G^(ɵ)=nFE^(ɵ)` `=-6xx96500xx0.34` `=-196.86kJmol^(-1)`
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Differentiate between : (a) Xenogamy and Geitonogamy (b) Oviparous and Viviparous organisms (c) Parthenogenesis and Parthenocarpy
(a) Geitonogamy : This is transfer of pollen grains from anther to the stigma of another flower of the same plant. (ii) It is genetically smilar to autogamy since pollengrains...
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