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For which of the following processes is ...

For which of the following processes is `DeltaS` negative?

A

C (diamong) `to` C(grpahite)

B

`N_(2)`(g, 1 at ) `toN_(2)` (g,5atm)

C

`N_(2)` (g,273K)`toN_(2)` (g,300K)

D

`H_(2)(g)to2H(g)`

Text Solution

Verified by Experts

The correct Answer is:
B
(a) When diamond is converted into graphite when it is heated to `1500^(@)C` and entropy is increased of `DeltaSgt0`
(b) When pressure increases then molecules of gas will come closer and intermolecular distance decreases so entropy will also decrease and `DeltaSlt0`
(c) When we increase the temperature of a gas then randomness is increased due to kinetic energy gained by molecules. So `DeltaSgt0`
d. `H_(2)` molecule is converted into atoms, the no. of particles increases. Thus entropy will increase. So `DeltaSgt0`
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Knowledge Check

  • For which of the following process, DeltaS is negative?

    A
    `H_(2)(g) to 2H(g)`
    B
    `N_(2)(g)(1atm)to N_(2)(g)(8atm)`
    C
    `2SO_(3)(g)to2SO_(2)(g)+O_(2)(g)`
    D
    `C_(("diamond"))to C_(("graphite"))`

  • For which of the following reactions DeltaS is negative ?

    A
    `Mg_((s)) + Cl_(2(g)) rarr MgCl_(2(s))`
    B
    `H_(2)O_((I)) rarr H_(2)O_((g))`
    C
    `CaCO_(3(s)) rarr CaO_((s)) + CO_(2(g))`
    D
    `I_(2(g)) rarr 2I_((g))`

  • For which of the following process would DeltaS be expected to be most positive?

    A
    `C_(6)H_(12)O_(6)(g) to 6CO_(2)(g)+6H_(2)O(g)`
    B
    `CO_(2)(g) toCO_(2)(s)`
    C
    `Na^(+)(aq)+ Cl^(-)(aq) toNaCl(s)`
    D
    `Cl_(2)(g)+H_(2)(g) to2HCl(g) `

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