MULTIPLE CHOICE. Possibly multiple correct answers 1) Which ones of the followin

Question

MULTIPLE CHOICE. Possibly multiple correct answers 1) Which ones of the following processes are spontaneous? A) Expansion of gas into vacuum B) Melting of ice at-10°C C) Boiling of water at 101°C, 1 atm D) NaCl dissolving in pure water at 25°C E) Gaseous water condensed into liquid at 5°C and 1 atm F) NaCI dissocated into sodium metal and chlorine gas G) Sublimation of solid carbon dioxide into gas at 25°C and 1 atm Nitrogen molecule dissociated into nitrogen atoms 2) Which ones of the following processes will the entropy of the substance increase? A) Increase in temperature B) Ionization of NaCl solid into ions at gas state C) Sublimation D) Dissolving E) Gas compressed at constant temperature F) Freezing G) CuCl2(s)+ H2O1) CuO(s2HCI(g) H) PbCl2(s) - Pb2+(aa)+ 2CI-(aq) ) H2O(I) + SO2(g) H2SO3(aq) K) HCl(l) + NaHCO3(aq) H2O(l)-CO2(g) + NaCl(aq)

Explanation / Answer

Spontaneous process is the one in which the it goes on itself ,once started and no any external energy is required and mostly entropy increases of that kind of system

A)spontaneous

B)melting of ice is spontaneous

C)Non-spontaneous {heat is provided to make water boil}

D)spontaneous

E)non-spontaneous {pressure is needed to dissolve water)

F)Non -spontaneous as energy is provided to make metal from NaCl

G)Spontaneous

H)Non-spontaneous as energy is needed to break the molecule

2.

entropy is degree is randomness and mathematically entropy = dq/T

A) decrease

B)increase

C)increase

D)increase

E)decrease

F)decrease

G)increase as solids and liquids giving 2 moles gas

H)increase

I)decrease

K)increase

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