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 :

Anonymous User Chemistry 22 Apr, 2020 98 views

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

Anonymous User Chemistry 22 Apr, 2020 66 views

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 :

Anonymous User Maths Probability 22 Apr, 2020 58 views

Two dice are thrown together. Then the probability, that the sum of numbers appearing on them is a prime number, is

Anonymous User Maths Probability 22 Apr, 2020 66 views

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

Anonymous User Maths 22 Apr, 2020 66 views

If the latusrectum of an ellipse with axis along X-axis and centre at origin is 10 and distance between foci is length of minor axis, then the equation of the ellipse is

Anonymous User Maths 22 Apr, 2020 58 views

The coefficient of x4 in the expansion of

Anonymous User Maths 22 Apr, 2020 61 views

Locus of the points which are at equal distance from 3x + 4y – 11 = 0 and 12x + 5y + 2 = 0 and which is near the origin is

Anonymous User Maths 22 Apr, 2020 347 views

The sum of the series 3.6 + 4.7 + 5.8 + ......upto (n – 2) terms is?

Anonymous User Maths 22 Apr, 2020 101 views

if  3f(x) - f(1 / x)  =  , then

Anonymous User Maths 22 Apr, 2020 60 views

The function f(x) = log (1 +x / 1 -x) stisfies the equation

Anonymous User Maths 22 Apr, 2020 56 views

Ethyl isocyanide on hydrolysis in acidic medium generates

Anonymous User Chemistry 21 Apr, 2020 72 views

When primary amine reacts with chloroform in 5. ethanolic KOH then the product is

Anonymous User Chemistry 21 Apr, 2020 64 views

The compound formed on heating chlorobenzene with chloral in the presence of concentrated sulphuric acid is

Anonymous User Chemistry 21 Apr, 2020 63 views

The smog is essentially caused by the presence of

Anonymous User Chemistry 21 Apr, 2020 69 views

Which one of the following types of drugs reduces fever?

Anonymous User Chemistry 21 Apr, 2020 58 views

Let R={(1,3),(4,2),(2,4),(2,3),(3,1)}be a relation on the set A = {1, 2, 3, 4}. The relation R is

Anonymous User Maths Set, Relations and Functions 21 Apr, 2020 59 views

Two lenses of power –15 D and +5 D are in contact with each other. What will be the focal length of the combination?

Anonymous User Physics Ray Optics 21 Apr, 2020 90 views

The two functional groups present in a typical 29. 30. carbohydrate are?

Anonymous User Chemistry Biomolecules 20 Apr, 2020 70 views

Copper crystallizes in fcc with a unit cell length of 361 pm. What is the radius of copper atom ?

Anonymous User Chemistry State of matter 20 Apr, 2020 71 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

Anonymous User Chemistry Solutions 20 Apr, 2020 67 views

What is The highest recorded body temperature at which a human can survived ?

Anonymous User Biology 20 Apr, 2020 64 views

Which is strongest muscle in human body

Anonymous User Biology 20 Apr, 2020 65 views

Does Plants are capable of recognizing their siblings?

Anonymous User Biology 20 Apr, 2020 68 views

Does Oysters change their sex?

Anonymous User Biology 20 Apr, 2020 66 views

Which is most poisonous vertebrate in world?

Anonymous User Biology 20 Apr, 2020 68 views

How much time Common cold virus can survive outside the body?

Anonymous User Biology 20 Apr, 2020 68 views

Can a person live with one lung ?

Anonymous User Biology 20 Apr, 2020 61 views

Can Our lungs are float on water?

Anonymous User Biology 20 Apr, 2020 62 views

Why do we talk in our steep? Why we see unknown faces in the dream?

Anonymous User Biology 20 Apr, 2020 67 views

What are paracetamol and steroidal drugs and how do they work?

Anonymous User Biology 20 Apr, 2020 58 views

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 61 views

To get three images of a single object, one should have two plane mirrors at an angle of

Anonymous User Physics Ray Optics 20 Apr, 2020 53 views

The image formed by an objective of a compound microscope is

Anonymous User Physics Ray Optics 20 Apr, 2020 57 views

An astronomical telescope has a large aperture to

Anonymous User Physics Ray Optics 20 Apr, 2020 67 views

Which of the following is used in optical fibres?

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

Anonymous User Physics Ray Optics 20 Apr, 2020 60 views

If two mirrors are kept at 60° to each other, then the number of images formed by them is

Anonymous User Physics Ray Optics 20 Apr, 2020 59 views

Which of the following is used in optical fibers?

Anonymous User Physics Ray Optics 20 Apr, 2020 56 views

In total internal reflection when the angle of incidence is equal to the critical angle for the pair of media in contact, what will be angle of refraction?

Anonymous User Physics Ray Optics 20 Apr, 2020 63 views

Two similar thin equi-convex lenses, of focal length f each, are kept coaxially in contact with each other such that the focal length of the combination is F1. When the space between the two lenses is filled with glycerin (which has the same refractive index (μ = 1.5) as that of glass) then the equivalent focal length is F2.TheratioF1 :F2 willbe:

Anonymous User Physics Ray Optics 20 Apr, 2020 144 views

Which of the following nuclear reactions will generate an isotope?

Anonymous User Chemistry Nuclear Chemistry 19 Apr, 2020 64 views

A radioactive element gets spilled over the floor of  a room. Its half­life period is 30 days. If the initial velocity is ten times the permissible value, after how many days will it be safe to enter the room?

Anonymous User Chemistry Nuclear Chemistry 19 Apr, 2020 64 views