1for 3 is it 2??????????/
which of the following reactions is irreversible
2KClO3 -> 2KCl + 3O2
or
Fe3+ + SCN -> Fe(SCN)2+
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52 Answers
1bt der is one more thing the positively charged kernels are fixed in the metals
13Which of the followin alkali metal is most reactive
1. Na
2 K
3. Cs
4 .Rb
13@richa yes i agree but v do hav charge separation in metallic bond jus lyk ionic
so y cnt it b calld similar to ionic then ?
13A coin is placed on a horizontal platform , which undergoes horizontal simple harmonic motion abt a mean position. The coin does not slip on the platform. The force of friction acting on the coin is
1. Zero when the coin and the platform come to rest momentarily at the extreme position of the harmonic motion
2. maximum when the coin and platform come to rst momentarily at the extreme position of the harmonic motion
3 . Is always directed towards the mean position
4. Is directed towards mean position when the coin is moving away from the mean position and away when the coin moves towards the mean position .
a.. 1,2
b.. 2,4
c.. 1,3
d.. 1,4
13In a potentiometer experiment for measuring the e.m.f. of a cell, the null point is at 480 when we have a 400 ohm resistior in series with the celll and galvanometer. If the series resistance is reduced to half., the nulll point will be at
1. 480
2. 120
3. 240
4.600
13@richa sorry i forgt to post the options in tht ques .....check it nao
13Metallic bond is similar to
1. ionic bond
2. covalent bond
3. nether ionic nor covalent
4. formed by movement of positively charged spheres in a sea of electrons
1the resistance is in series with potentimeter waala cell or jiski emf measure karni hai
13it clearly says resistance wid the cell
wid that i got it....thnx richa
it was a gud ques btw
13It is hotter for the same distance over the top of the fire than it is in the side if it , mainly becoz
1. conduction, convection and radiation all contribute significantly transferrin g heat upwards
2. heat is radiated upwards
3. air conducts heat upwards
4. convection takes more heat upwards
13@richa yes it is ....
but why???
we noe tht amongst the option Na lies at the top in the reactivity sreies ...then how come
it is Cs???
13Beats are produced by two progressive waves . Maximum loudness at the waxing is x times the loudness of each wave. The value of x is
1.. 2
2.. 4
3.. 1
4.. NONE