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1
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The $Mn^(3+)$ ion is unstable in solution and undergoes desproportionation reaction to give $Mn^(+2), MnO_(2)$, and $H^(o+)$ ion. Write a balanced ion
asked
Jan 5, 2021
in
Chemistry
by
kratos
chemical calculations
class-11
redox reaction
basic concepts of chemistry
redox-reactions
+3
votes
1
answer
The number of real roots of the polynomial equation x^4 - x^2 + 2x - 1 = 0 is (a) 0 (b) 2 (c) 3 (d) 4
asked
Jan 8, 2021
in
Class 12
by
kratos
kvpy
class-11
class-12
+2
votes
1
answer
If for a sample of size 60, we have the following information Σx^2i = 18000 and Σxi = 960, then the variance is
asked
Jan 9, 2021
in
Class 11
by
kratos
statistics
class-11
+3
votes
1
answer
Which of the following solution with same concentration will have highest pH :
asked
Jan 8, 2021
in
Class 12
by
kratos
ionic equilibria
class-12
+2
votes
1
answer
Which will be the most stble among $ Cu^(+) , Fe^(+) Fe^(2+)$ and $Fe^(3+)$.
asked
Jan 8, 2021
in
JEE
by
kratos
jee
kvpy
class-11
jee mains
chemical-bonding
periodic-table
coordination compounds
+3
votes
1
answer
एक तत्व B के इलेक्ट्रॉनिक विन्यास 2,8,7 है तथा वह तत्व A के साथ अभिक्रिया कर $AB_(2)$ प्रकार का आयनिक यौगिक बनाता है , तत्व A की संयोजकता क्या होगी ?
asked
Jan 9, 2021
in
Class 10
by
kratos
तत्वों-का-आवर्ती-वर्गीकरण
class-10
+2
votes
1
answer
When $NaNO_(3)$ is heated in a closed vessel, oxygen is liberated and $NaNO_(2)$ is left behind. At equilibrium,
asked
Jan 7, 2021
in
JEE
by
kratos
jee
chemical
ionic equilibrium
class-11
jee mains
chemical-equilibrium
+1
vote
1
answer
In hydrogen atom an **** has a diemeter of about $16.92$ .What in the maximum number of electron that can be accommodated ?
asked
Jan 9, 2021
in
Class 11
by
kratos
class-11
atomic-structure
+1
vote
1
answer
The length of the perpendicular drawn from the point $P(3,4,5)$ on y-axis is
asked
Jan 7, 2021
in
Class 11
by
kratos
class-11
introduction-to-three-dimensional-geometry
+3
votes
1
answer
If velocity [V], time [T] and force [F] are chosen as the base quantities, the dimensions of the mass will be
asked
Jan 4, 2021
in
Class 12
by
kratos
physical world & measurement
neet
jee
jee main 2021
class-11
jee main
neet 2021
+3
votes
1
answer
Basic process for production of yoghurt , cheese and cream is different.
asked
Jan 3, 2021
in
Biology
by
kratos
introduction-to-microbiology
class-10
+2
votes
1
answer
उस पदार्थ का नाम बताएँ जिसे जैविक विधि द्वारा विखंडित किया जाता है।
asked
Jan 3, 2021
in
Class 10
by
kratos
class-9
विद्युत
हमारा-पर्यावरण
प्रायोगिकी
class-10
+2
votes
1
answer
1. Chlorine is produced by which of the following process? (i) Electrolysis (ii) Evaporation
asked
Jan 6, 2021
in
Chemistry
by
kratos
acids bases and salts
class-12
class-10
electrochemistry
+1
vote
1
answer
Find the value of: i. (i x j).k+i.j ii. (j x k).i+j.k iii. i x (j+k)+j x (k+i)+k x (i+j)
asked
Jan 9, 2021
in
Class 12
by
kratos
class-12
vector
cross product
+3
votes
1
answer
Some voluntary movements those result in a change of place or location are called
asked
Jan 8, 2021
in
Class 11
by
kratos
locomotion-and-movement
class-11
+2
votes
1
answer
Match the column: ${:(,"Column I", , "Column II"),((A)," Electron moving in "2^(nd)"obit in "He^(+)"ion electron is",(P),"Radius of orbit in which mov
asked
Jan 9, 2021
in
Class 11
by
kratos
class-11
atomic-structure
+2
votes
1
answer
Work done in the process $C rarrA$ is
asked
Jan 7, 2021
in
Class 11
by
kratos
class-11
p-block-elements
alkenes
periodic-table
+3
votes
1
answer
A vibration magnetometer placed in a magnetic meridian has a small bar magnet. The magnet executes oscillations
asked
Jan 9, 2021
in
Class 12
by
kratos
class-12
neet
jee
magnetic effect of current
permanent magnets
aiims
jee mains
magnetism and matter
+2
votes
1
answer
Prove that $cos(x+y)=cosxcosy-sinxsiny$
asked
Jan 5, 2021
in
JEE
by
kratos
jee
trigonometric functions
class-11
trigonometric-functions
jee mains
inverse trigonometric functions
+3
votes
1
answer
A body is moving along a circular path of radius R. What will be the distance travelled and displacement of the body when it completes half a revoluti
asked
Jan 10, 2021
in
Class 9
by
kratos
class-9
cbse
motion
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