In a radioactive decay, neither the atomic number nor the mass number changes.

q + w = ΔU. As ΔU is a state function, hence q + w is a state function.  On dissolution, entropy increases i.e., ΔS is +ve. If TΔS > ΔH,  then...

Number of kings and queen in a deck of 52 cards = 8 P( either a king or a queen) = 8/52 = 2/13 P(neither a king nor a queen) = 1-2/13...

(c) The surface tension may be zero. (d) The contact angle may be 90°. Explanation:  The rise in a capillary tube is given as, h = 2S.cosθ/rρg The capillary tube has a certain...

(c) :- In Wurtz reaction alkyl halide reacts with sodium metal in the presence of dry ether to give alkane.

The correct answer is (c) (c) may be in thermal equilibrium.

(e) If the drawn ball is neither red nor green, then it must be blue, which can be picked in 7C1 = 7 ways. One ball can be picked from...

ΔU = q + w and ‘∆U’ is a state function, which depends upon initial and final states of the system and not upon its path. 

(i) q+w =∆U. As ∆U is a state function, hence q+w is a state function.  (ii) On dissociation ,entropy increases, i.e. ,∆S is +ve .Though ∆His +ve but if T∆S>∆H, then...

Time is an example of Scalar

(a) Realtive permeabiolity