Home
Class 12
CHEMISTRY
In which of the following process entrop...

In which of the following process entropy increases?
a) A liquid evaporates to vapour.
b) Temperature of a crystalline solid lowered from 115 K to 0 K.
c) `CaCO_(3(s))toCaO_((s))+CO_(2(g))`
d) `Cl_(2(g))to 2Cl_((g))`

Text Solution

Verified by Experts

a) A liquid evaporates vapour: During the vapourisation, the liquid absorbs heat at constant temperature. In this process the liquid state converts into gaseous state. In the liquid state the particles are close to one another and somewhat the order of the particles is more. In gaseous state the order of the particles is less and disorder increases due to the random motion of gaseous particles. So entropy increases during the vapourisation of a liquid.
b) Temperature of a crystalline solid lowered from 115 K to 0 K : In a crystalline solid the particles are arranged in an orderly manner. Due to decrease in temperature there will be no change in the order but due to decrease in vibrational energies the entropy decreases.
c) `CaCO_(3(s))toCaO_((s))+CO_(2(g))` : Here on of the product is gas in which randomness increases than in the solid reactant. So entropy increases.
d) `Cl_(2(g))to2Cl_((g))` : Here both are gases but one `Cl_(2)` molecular converts into `2Cl` atoms due to which randomness increases. So entropy increases.
Doubtnut Promotions Banner Mobile Dark
|

Topper's Solved these Questions

  • THERMODYNAMICS

    VGS PUBLICATION-BRILLIANT|Exercise LONG ANSWER QUESTIONS|4 Videos

  • THERMODYNAMICS

    VGS PUBLICATION-BRILLIANT|Exercise ADDITIONAL QUESTIONS & ANSWERS|6 Videos

  • THERMODYNAMICS

    VGS PUBLICATION-BRILLIANT|Exercise ADDITIONAL QUESTIONS & ANSWERS|6 Videos

  • THE s-BLOCK ELEMENTS

    VGS PUBLICATION-BRILLIANT|Exercise Long Answer Question (8 Marks)|25 Videos

  • TS MARCH -2018

    VGS PUBLICATION-BRILLIANT|Exercise SECTION -C|3 Videos

Similar Questions

Explore conceptually related problems

In which of the following processes entropy Increases ? a) A liquid evaporates to vapour. b) Temperature of a crystalline solid lowered from 115K to OK (c ) CaCO_(3(s)) to CaO_(s) +CO_(2(g)) (d) Cl_(2(g)) to 2Cl_(g)

Predict in which of the following, entropy Increases/decreases : i) A liquid crystallizes into a solid. ii) Temperature of a crystalline solid is raised from 0K to 115 K. (iii) 2NaHCO_(3) (s) to Na_(2) CO_(3) (s)+CO_(2) (g)+H_(2)O(g) iv) H_(2) (g) to 2H(g)

Knowledge Check

  • What are the sign of the entropy change (+ or -) in the following: I : A liquid crystallises into a solid II: Temperature of a crystalline solid is raised from 0K to 115K III: 2NaHCO_(3(g)) rarr Na_(2)CO_(3(g)) + CO_(2(g)) + H_(2)O_((g)) IV : H_(2(g)) rarr 2H_((g))

    A
    `{:(I,II,III,IV),(-,+,+,+):}`
    B
    `{:(I,II,III,IV),(-,-,-,+):}`
    C
    `{:(I,II,III,IV),(-,-,-,+):}`
    D
    `{:(I,II,III,IV),(+,-,-,-):}`

  • Unit of K_p for NH_4COONH_(2(s)) harr 2NH_(3(g))+ CO_(2(g)) is

    A
    No units
    B
    `atm^2`
    C
    `atm^3`
    D
    `atm^(-3)`

  • In what manner will increase of pressure affect the following equation ? C_((s)) + H_(2)O_((g)) hArr CO_((g)) + H_(2(g))

    A
    Shift in the forward direction
    B
    shift in the reverse reaction
    C
    Increase in the yields of `H_(2)`
    D
    No effect

    • Similar Questions

    Explore conceptually related problems

    Predict in which of the following, entropy increases/decreases: (i) A liquid crystallizes into a solid (ii) Crystalline solid is heated from 0 K to 115 K. (iii) 2NaHCO _(3) (s) to Na _(2) CO _(3) (s) + CO _(2) (g) + H _(2) O (g) (iv) H _(2 (g)) to 2 H _((g))

    Which of the following reactions will get affected by increasing the pressure? Also, mention whether change will cause the reaction to go into forward or backward direction. (i) COCl_(2)(g)hArrCO(g)+Cl_(2)(g) (ii) CH_(4)(g)+2S_(2)(g)hArrCS_(2)(g)+2H_(2)S(g) (iii) CO_(2)(g)+C(s)hArr2CO(g) (iv) 2H_(2)(g)+CO(g)hArrCH_(3)OH(g) (v)CaCO_(3)(s)hArrCaO(s)+CO_(2)(g) (vi) 4NH_(3)(g)+5O_(2)(g)hArr4NO(g)+6H_(2)O(g)

    Which of the following reactions will get affected by increasing the pressure? Also mention whether chasnge will cause the reaction to go into forward or backward direction. (i) COCl_(2)(g)hArrCO(g)+Cl_(2)(g) (ii) CH_(4)(g)+2S_(2)(g)hArrCS_(2)(g)+2H_(2)S(g) (iii) CO_(2)(g)+C(s)hArr2CO(g) (iv) 4NH_(3)+(g)+5O_(2)(g)hArr4NO(g)+6H_(2)O(g)

    Based on entropy change predict a spontaneous reaction among the following. A : (NH_4)_(2) CO_(3(s)) to 2NH_(3(g)) + CO_(2(g)) + H_2O_((l)) and B : NH_(3(g)) + H_2S_((g)) to NH_4HS_((s)) .

    Equal moles of F_(2(g)) and Cl_(2(g)) are introduced into a sealed container and heated to temperature T to attain the following equilibria. Cl_(2(g)) + F_(2(g)) hArr 2C//F_((g)) , Kp_(I)= 3.2 , Cl_(2(g)) + 3 F_(2(g)) hArr 2 CIF_(2(g)) , Kp_(2) . If partial pressures of CIF and CIF_(3) at equilibria are 0.2 and 0.04 atm respectively. What is the value of Kp_(2) ?

    Home
    Profile