NEET Test 132...

The pK_b value of ammonium hydroxide is 4.75. An aqueous solution of ammonium hydroxide is titrated with HCl. The pH of the solution at the point where half of the ammonium hydroxide has been neutralized will be:

Through which of the following modes of communication can radio waves be sent from one place to another?

Leaf tendrils and stem tendrils are the two types of tendrils. Which of the following plants have leaf tendrils that are positively thigmotropic?

a. Peas
b. Passion flower
c. Glory lily
d. Bottle gourd

Which among the following sentence is not correct about the organelles?

The technique for DNA fingerprinting was developed by:

The motor of an electric train can give it an acceleration of 1 m/s² and its brakes can give it a negative acceleration of 3 m/s². The shortest time in which the train can make a trip between two stations 1350 m apart is

The vapour pressure of a solvent decreased by 10 mm of Hg when a non-volatile solute was added to the pure solvent. The mole fraction of the solute in the solution is 0.2. What should be the mole fraction of the solvent if the decrease in vapour pressure is required to be 20 mm of Hg?

In the equation where P is the pressure, y is the distance, k_B is Boltzmann constant and T is the temperature. Dimensions of β are:

Which of the following shows the numbers of the producers, herbivores and the carnivores at their successive trophic levels?

The decomposition of Cl₂O₇ at 400 K in the gas phase to Cl₂ and O₂ is a first order reaction. After 55 seconds at 400 K, the pressure of Cl₂O₇ falls from 0.062 atm to 0.044 atm. Calculate the pressure of Cl₂O₇, after 100 sec. of decomposition at the temperature.