Class 11th

(A) HOCl + H₂O₂ -> H₃O⁺ + Cl^- + O₂

(B)  $I_2+H_2{O}_2+2O{H}^{-}\to 2I^{-}+2H_{2}O+O_2$  

Choose the correct option.

An ideal gas undergoes a cyclic process whose indicator diagram is as shown in the figure. Find the work done by the gas in 1 complete cycle.

Two trains are approaching each other on the same track with velocity 100 km/h and 50 km/h. When they are at a distance of 300 km from each other, a bird starts flying from train 1 towards train 2. When the bird reaches train 2, it instantly reverses its direction and flies again towards train 1. This process continues till the bird is trapped between the trains when they collide. If the bird always travels at a constant speed 200 km/h, the total distance the bird flies is:

If temperature of a liquid is increased, choose the correct option regarding change in its surface tension and viscosity.

The speed of sound in a particular gas at a temperature 27°C is 340 m/s. Then, the speed of sound in the same gas at a temperature 90°C is:

Consider the elements Mg, Al, S, P and Si, the correct increasing order of their first ionization enthalpy is:

A particle of mass m with an initial velocity ui + 2uĵ collides with a particle of mass 3m at rest. After collision, the two particles stick together and the combined particle moves with a velocity vî + v'ĵ. Which of the following is incorrect?

Number of electron deficient molecules among the following PH₃, B₂H₆, CCl₄, NH₃, LiH and BCl₃ is

If mass M, area A' and velocity V are chosen as fundamental units, then the dimension of coefficient of viscosity will be:

An inclined plane in bent in such a way that the vertical cross-section is given by y $=\frac{x^2}{4}$  where y is in vertical and x in horizontal direction. If the upper surface of this curved plane is rough with coefficient of friction $\mu$ = 0.5, the maximum height in cm at with a stationary block with not skip downward is ____________cm.