MAH-MHT CET (PCM/PCB) entrance exam Question Bank Solutions

For the first order reaction A → B, the rate constant is 0.25 s^-1, if the concentration of A is reduced to half, the value of rate constant will be ________.

A certain zero order reaction has rate constant 0.025 M s^-1. What will be the concentration of reactant 'A' after 15 seconds, if initial concentration is 0.50 M?

A first order reaction, A → B takes 100 minutes for it's 90% completion. What is the rate constant of reaction?

The boiling points of different alkyl halides having same alkyl group decrease in the order

Which among the following pairs of elements in their respective oxidation states will have same value of effective magnetic moment?
(Atomic number: Sc = 21, Ti = 22, Cr = 24, Co = 27, Ni = 28, Zn = 30)

Identify the soft element from following.

What is the melting point of zinc?

Among the following isomeric amines, an amine having highest boiling point is:

Which of the following is an example of hydrophobic sol?

Which of the following compounds on heating with potassium permanganate and dilute sulphuric acid forms adipic acid?

Identify product B in the following reaction.

\[\ce{C6H5MgBr ->[dry ice][dry ether] A ->[HOH][dil. HCl] B}\]

What is the density of iron crystal which crystallizes in body-centred cubic structure with edge length 287 pm? (At. mass of Fe = 56 amu)

The number of atoms in 100 g of an fcc crystal with density 10 g cm^-3 and unit cell edge length 200 pm is equal to ______.

A solution of CUSO₄ is electrolyzed using a current of 1.5 amperes for 10 minutes. What mass of Cu is deposited at cathode? (At. Mass of Cu- 63.7)

Half-life of first order reaction is 20 minutes. What is the time taken to reduce the initial concentration of the reactant to `1/10`th?

What is the unit of rate constant for the zero order reaction?

Half-life of first-order reaction \[\ce{X -> Y + Z}\] is 3 minutes. What is the time required to reduce the concentration of 'X' by 90 % of it's initial concentration?

Which is the unit of rate constant for the first-order reaction if time is expressed in seconds?

Rate constant for zero order reaction is 2 × 10^-2 mol L^-1 s^-1. If the concentration of the reactant after 25 sec. is 0.5 M, what is the initial concentration of reactant?

For zero order reaction, when [A]_t is plotted against time (t), the slope of the straight line obtained is equal to ______.