Given the molecular formula of the hexa-coordinated complexes (i) CoCl3.6NH3, (ii) CoCl3.5NH3, (iii) CoCl3.4NH3 If the number of co-ordinated NH3 molecules in (i), (ii) and (iii) respectively are 6, 5, 4, the primary valencies in (i), (ii) and (iii) are :

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A white sodium salt dissolves readily in water to give a solution which is neutral to litmus. When silver nitrate solution is added to the solution, a white precipitate is obtained which does not dissolve in dil. HNO3. The anion could be

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Exactly 2 machines out of 4 are faulty. They are tested one by one in a random order till both the faulty machines are identified. Then, the probability that only two tests are required is :

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A school has four sections of chemistry in class XII having 40, 35, 45 and 42 students. The mean marks obtained in Chemistry test are 50, 60, 55 and 45 respectively for the four sections, the over all average of marks per students is

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## The coefficient of x4 in the expansion of The coefficient of x4 in the expansion of Anonymous User Maths 22 Apr, 2020 57 views

## The value of The value of Anonymous User Maths 22 Apr, 2020 53 views

## if  3f(x) - f(1 / x)  =  , then if  3f(x) - f(1 / x)  = , then Anonymous User Maths 22 Apr, 2020 55 views

Two liquids X and Y form an ideal solution. At 300 K, vapour pressure of the solution containing 1mol of X and 3 mol of Y is 550 mm Hg.Atthesame temperature, if 1 mol of Y is further added to this solution, vapour pressure of the solution increases by 10 mm Hg. Vapour pressure (in mm Hg) of X and Y in their pure states will be, respectively

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A light ray is incident perpendicular to one face of a 90° prism and is totally internally reflected at the glass­ air interface. If the angle of reflection is 45°, we conclude that the refractive index n Anonymous User Physics Ray Optics 20 Apr, 2020 57 views

Wavelength of light used in an optical instrument are = 4000 Å and = 5000 Å, then ratio of their respective resolving powers (corresponding to and ) is

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