Which of the following always has a negative value?
(a) heat of reaction (b) heat of solution
(c) heat of combustion (d) heat of formation

 The bond energy depends upon
(a) size of the atom (b) electronegativity
(c) bond length (d) all of the above

For an endothermic reaction.
(a) ∆H is -ve (b) ∆H is +ve
(c) ∆H is zero (d) none of these

The process depicted by the equation.
H₂O (S) ——> H₂O (l) ∆H = +1.43 kcal represents
(a) fusion (b) melting
(c) evaporation (d) boilirtg

Which one is the correct unit for entropy?
(a) KJ mol (b)JK mol
(c)JK mol^-1 (d) KJ mol^-1

Why standard entropy of an elementary substance is not zero whereas the standard enthalpy of formation is taken as zero?

any thermodynamically feasible reactions do not occur under ordinary conditions. Why?

The function f : A → B defined by f(x) = 4x + 7, x ∈ R is
(a) one-one
(b) Many-one
(c) Odd
(d) Even

The smallest integer function f(x) = [x] is
(a) One-one
(b) Many-one
(c) Both (a) & (b)
(d) None of these

The function f : R → R defined by f(x) = 3 – 4x is
(a) Onto
(b) Not onto
(c) None one-one
(d) None of these

The number of bijective functions from set A to itself when A contains 106 elements is
(a) 106
(b) (106)²
(c) 106!
(d) 2¹⁰⁶