A pipe open at both ends has a fundamental frequency f in air. The pipe is dipped vertically in water so that half of it is in water. The fundamental frequency of the air column is now :
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Which one of the following molecules is expected to exhibit diamagnetic behaviour?
If [a×bb×cc×a]=λ[abc]2, then l is equal to
The sum of coefficients of integral powers of x in the binomial expansion of (1−2x)50 is:
Distance of the centre of mass of a solid uniform cone from its vertex is Z0. If the radius of its base is R and its height is h then Z0 is equal to :
The vapour pressure of acetone at 20∘C is 185 torr. When 1.2 g of a non - volatile substance was dissolved in 100 g of acetone at 20∘C, its vapour pressure was 183 torr. The molar mass (gmol−1) of the substance is :
Consider the following reaction: xMnO4−+yC2O42−+zH+3/4 xMn2++2yCO2+2zH2O The values of x, y and z in the reaction are, respectively:
The order of stability of the following carbocations:
Sodium metal crystallizes in a body centred cubic lattice with a unit cell edge of 4.29 Å. The radius of sodium atom is approximately :