Home
Class 12
PHYSICS
When a black coloured mineral is treated...

When a black coloured mineral is treated with KOH in presence of air a green coloured compund A is formed, find total electron(s) in e-orbitals of central metal of A by considering CFT.

Text Solution

Verified by Experts

The correct Answer is:
A
`MnO_2 + KOH overset(o_2)to K_2MnO_4 + H_2O`
----`t_2`
---e
one electron in `e_g`.
Promotional Banner

Topper's Solved these Questions

  • SCORE TEST 2

    NEET MAJOR TEST (COACHING)|Exercise PHYSICS|25 Videos

Similar Questions

Explore conceptually related problems

(a) A blackish brown coloured solid 'A' when fused with an alkali metal hydroxide in the presence of air, produces a dark green colored compound 'B' which upon electrolytic oxidation in alkaline medium gives a dark purple coloured compound 'C'. Identify A,B and C and write the reactions involved. (b) What happesn when acidic solution of green compound (B) is allowed to stand for sometime? Give the equation involved. What is this type of reaction called ?

Isopropyl benzene is oxidised in the presence of air to a compound 'A'. When compound 'A' is treated with dilute mineral acid, the armatic product formed is :

When an object made of material P is kept immersed in the blue coloured solution Q, then a chemical change takes place to form a green coloured solution R and a brown layer of substance S is deposited on the object. P is used for making nails and S is used for making electric wires. Name the green coloured solution R.

Paramagnetism is a property due to the presence of unpaired electrons. In case of transition metals, as they contain unpaired contain unpaired electrons in the (n-1) d orbitals , most of the transition metal ions and their compounds are paramagnetic . Paramagnetism increases with increases in number of unpaired electrons. Magnetic moment is calculated from spin only formula' Vz mu=sqrt(n(n+2)) B.M n="number of unpaired electrons" Similarly the colour of the compounds of transition metals may be attributed to the presence of incomplete (n-1) d sub-shell. When an electron from a lower energy of d-orbitals is excited to a higher energy d-orbital, the energy of excitation corresponds to the frequency of light absorbed. This frequency generally lies in the visible region. The colour observed corresponds to complementry colour of the light obserbed. The frequency of the light absorbed is determined by the nature of the ligand. Which of the following pair of Compounds is expected to exhibit same colour in aqueous solution

When an object made of material P is kept immersed in the blue coloured solution Q, then a chemical change takes place to form a green coloured solution R and a brown layer of substance S is deposited on the object. P is used for making nails and S is used for making electric wires. Name the blue coloured solution Q.

NEET MAJOR TEST (COACHING)-TEST 1 -PHYSICS
  1. An acid catalysed hydrolysis of ester follows rate law,R=k[CH3COOC2H5]...

    Text Solution

    |

  2. Number of properties given below have higher value for protium than de...

    Text Solution

    |

  3. When a black coloured mineral is treated with KOH in presence of air a...

    Text Solution

    |

  4. How many of the organic products (M.F.=C5H9Br2Cl) formed above are opt...

    Text Solution

    |

  5. The number of solution(s) of the trigonometric equation sec^2x+cosec^2...

    Text Solution

    |

  6. Number of possible point C such that area of triangleABC is 10 square ...

    Text Solution

    |

  7. If z is a complex number such that amp ("z-2"/"2z+3i")=0 and z0=3+4i,...

    Text Solution

    |

  8. Number of integral values of 'a' for which (a-5)x^2 - 2ax + (a-4)=0 , ...

    Text Solution

    |

  9. If in a triangleABC, angle A is greatest, also given sinA + sinB + sin...

    Text Solution

    |

  10. Two circles with unequal radii,centred at A and B respectively,touch e...

    Text Solution

    |

  11. lim(Nrarroo) sum(r=1)^n (2r-1)/2^r is equal to :-

    Text Solution

    |

  12. lim(Nrarroo) [(1-2sin theta)^nsum(r=0)^n .^nCr((sin 2 theta+sin theta...

    Text Solution

    |

  13. A circle passes through the points of intersection of the parabola y+1...

    Text Solution

    |

  14. Rectangle ABCD has area 200 sq. unit.An ellipse with area 200pi sq.uni...

    Text Solution

    |

  15. if sum(n=1)^oo tan^(-1)(1/(7-5n+n^2))=pi/2 +tan^(-1)c , then c is equa...

    Text Solution

    |

  16. If the equation in x given by (2(1/(cos^(-1)x)))^(2pi)-(a+1/2)(2(1/(co...

    Text Solution

    |

  17. if 'a' is the number of distributions of six different balls into thre...

    Text Solution

    |

  18. Number of points where the function f(x)={{:(max(|x^2-x-2|","x^2-3x)",...

    Text Solution

    |

  19. A triangle has sides of length 6, 7 and 8. The line through its incent...

    Text Solution

    |

  20. Let f be a differentiable function with range (0,oo) and g(x)=(f(x))^2...

    Text Solution

    |