Two light beams produce interference pattern to give maxima and minima on the screen. If the intensities of the light beams are in the ratio of 9:4, then the ratio of intensities of maxima and minima is

The axes of the polariser and analyser are inclined to each other at 60° If the amplitude of polarised light emergent through analyzer is A The amplitude of unpolarised light incident on polariser is

In ion central metal ion has d-electrons equal to

On heating NaCl + K₂Cr₂O₇ + H₂SO₄ conc., the gas that comes out is

Which of the following pairs of isomers and types of isomerism are correctly matched
1) [Co (NH₃)₅(NO₂)] Cl₂ and [Co (NH₃)₅(ONO)] Cl₂ linkage
2) [Cu (NH₃)₄] [PtCl₄] and [Pt (NH₃)₄] [CuCl₄] ------ Coordination
3) [Pt (NH₃)₄Cl₂] Br₂ and [Pt (NH₃)₄Br₂] Cl₂. Ionization

Energy levels A, B, C of a certain atom corresponds to increasing values of energy i.e. E_A < E_B < E_C. If , and are the wavelengths of radiations corresponding to the transitions C to B, B to A and C to A respectively, which of the following statement is correct.

The ionization constant of in water is 5.6 ×´ 10^-10 at 25^oC. The rate constant for the reaction of and OH^- to form NH₃ and H₂O at 25^oC is 3.4 × 10¹⁰ L mol^-1 s^-1. The rate constant for proton transfer from water to NH₃ is

For the curve y² = (x + a)³ the square of the sub tangent varies as

For such questions, we should know the concept of subnormal and subtangent.