Class 11th

Given below are two statements:

Statement I: In 'Lassaigne's Test', when both nitrogen and sulphur are present in an organic compound, sodium thiocyanate is formed.

Statement II: If both nitrogen and sulphur are present in an organic compound, then the excess of sodium used in sodium fusion will decompose the sodium thiocyanate formed to given NaCN and Na₂S.

In the light of the above statements, choose the most appropriate answer from the option given below:

Which of the following is the correct plot for the probability density ${\psi }^2\left(r\right)$  as a function of distance 'r' of the electron from the nucleus for 2s orbital?

A ball of mass 0.5 kg is dropped from the height of 10m. The height, at which the magnitude of velocity becomes equal to the magnitude of acceleration due to gravity, is __________m.

           [Use g = 10m/s²]

Polar stratospheric clouds facilitate the formation of:

A fighter jet is flying horizontally at a certain with a speed of 200ms^-1. When it passes directly overhead ad anti-aircraft gun, a bullet is fired from the gun, at an angle (θ)with the horizontal, to hit the jet. If the bullet speed is 400m/s, the value of (θ)will be _____________.

Using the rules for significant figures, the correct answer for the expression $\frac{0.02858*0.112}{0.5702}$  will be

What is involved in an oxidation-reduction reaction?

What is the redox reaction formula?

What are all the redox reactions?

The correct order of melting points of hydrides of group 16 elements is: