Suppose A and B are sets such that n(A) = 10, n(B) = 23 and n(A∩B) = 4, then which of the following is equal to n(A∆B)?

Of 100 students, 65 are members of mathematics club and 40 are members of a physics club. If 10 are members of neither club, then how many students are members of both clubs?

Of 100 staff members of a school, 48 drink coffee, 25 drink both tea and coffee and everyone drinks either coffee or tea. How many stuff members drink tea?

What is the molecular geometry of O₃ ?

What is the molecular shape of BrF₄⁻ ?

How many sigma and pi bonds are there in ethylene ( C₂H₄) ?

Let A be 3×3 matrix; if |A| = 8, then |3A| is equal to:

Let A be a 3 × 3 triangular matrix and its diagonal elements are 1, 4, and 2. Then which one of the following is not true about its determinate?

If matrix A is a 3 × 3 matrix and its 1st row elements are identical with 3rd row elements. Then matrix A is:

A system of homogeneous equation always has:

What is the magnetic field strength when a current of 6A flows in a wire 3m long and produces a force of 36N ?

Consider the following chemical equation:
PCl₅ + H₂O ------>H₃PO₄ + HCl.
Then what is the coefficient of HCl after balancing of chemical equation?

For endothermic reactions, change in enthalpy (∆H) is:

How many moles of CaO are needed to react with excess water to produce 370 g of calcium hydroxide?

How many liters of sulphur trioxide are formed when 4800 cm³ of sulphur dioxide is burned in air?

When 20g of sulphur dioxide reacts with oxygen, 23 g of sulphur trioxide is formed. What is the percentage yield?

What is the oxidation number of Fe in K₄[Fe(CN)₆] ?

The reactions in which oxidation and reduction do not occur and such types of reactions are known as ___________.

A catalyst increases the reaction rates by changing the reaction mechanism.