Previous Year Papers

Download Solved Question Papers Free for Offline Practice and view Solutions Online.

Test Series

Take Zigya Full and Sectional Test Series. Time it out for real assessment and get your results instantly.

Test Yourself

Practice and master your preparation for a specific topic or chapter. Check you scores at the end of the test.

Thermodynamics

Short Answer Type

261.

Explain Gibb's Helmholtz equation.

209 Views

Long Answer Type

262. Explain the state of reaction when:
(a) ∆G < 0 (b) ∆G = 0 (c) ∆G > 0.

156 Views

Short Answer Type

263.

When ∆G is positive, the process is always non-spontaneous. Explain.

124 Views

Long Answer Type

264.
Prove that ∆G = –T∆S_total.

The change in entropy in a process carried out in a non-isolated system is given by
∆S_total = ∆S_system + ∆S_surroundings ...(1)
Consider an isothermal process carried out at constant pressure in which heat q is transferred by the surroundings to the system.

Substituting this value in (1), we have,

It has been shown that must be positive for a process to be spontaneous. Therefore, equation (2) becomes useful in predicting the spontaneity of a process in terms of ∆G.

108 Views

265.

What is free energy change? Show that the change in free energy is equal to useful work done.
or
prove that –∆G = w_{(useful work)}

158 Views

Short Answer Type

266.

Predict the enthalpy change, free energy change and entropy change when ammonium chloride is dissolved in water and the solution becomes colder.

193 Views

267.

At $<pre>uncaught exception: Http Error #404 in file: /home/config_admin/public/felixventures.in/public/application/css/plugins/tiny_mce_wiris/integration/lib/com/wiris/plugin/impl/HttpImpl.class.php line 61 #0 [internal function]: com_wiris_plugin_impl_HttpImpl_0(Object(com_wiris_plugin_impl_HttpImpl), NULL, 'http://www.wiri...', 'Http Error #404') #1 /home/config_admin/public/felixventures.in/public/application/css/plugins/tiny_mce_wiris/integration/lib/php/Boot.class.php(769): call_user_func_array('com_wiris_plugi...', Array) #2 [internal function]: _hx_lambda->execute('Http Error #404') #3 /home/config_admin/public/felixventures.in/public/application/css/plugins/tiny_mce_wiris/integration/lib/haxe/Http.class.php(532): call_user_func_array(Array, Array) #4 [internal function]: haxe_Http_5(true, Object(com_wiris_plugin_impl_HttpImpl), Object(com_wiris_plugin_impl_HttpImpl), Array, Object(haxe_io_BytesOutput), true, 'Http Error #404') #5 /home/config_admin/public/felixventures.in/public/application/css/plugins/tiny_mce_wiris/integration/lib/php/Boot.class.php(769): call_user_func_array('haxe_Http_5', Array) #6 [internal function]: _hx_lambda->execute('Http Error #404') #7 /home/config_admin/public/felixventures.in/public/application/css/plugins/tiny_mce_wiris/integration/lib/com/wiris/plugin/impl/HttpImpl.class.php(27): call_user_func_array(Array, Array) #8 /home/config_admin/public/felixventures.in/public/application/css/plugins/tiny_mce_wiris/integration/lib/haxe/Http.class.php(444): com_wiris_plugin_impl_HttpImpl->onError('Http Error #404') #9 /home/config_admin/public/felixventures.in/public/application/css/plugins/tiny_mce_wiris/integration/lib/haxe/Http.class.php(458): haxe_Http->customRequest(true, Object(haxe_io_BytesOutput), NULL, NULL) #10 /home/config_admin/public/felixventures.in/public/application/css/plugins/tiny_mce_wiris/integration/lib/com/wiris/plugin/impl/HttpImpl.class.php(40): haxe_Http->request(true) #11 /home/config_admin/public/felixventures.in/public/application/css/plugins/tiny_mce_wiris/integration/lib/com/wiris/plugin/impl/TextServiceImpl.class.php(80): com_wiris_plugin_impl_HttpImpl->request(true) #12 /home/config_admin/public/felixventures.in/public/application/css/plugins/tiny_mce_wiris/integration/service.php(19): com_wiris_plugin_impl_TextServiceImpl->service('mathml2accessib...', Array) #13 {main}</pre>$ , ice and water are in equilibrium and $increment straight H space equals space 6.00 space kJ space mol to the power of negative 1 end exponent$ for the process $straight H subscript 2 straight O left parenthesis l right parenthesis.$ Calculate $increment straight S$ for the conversion of ice to liquid water.

92 Views

268.

For the reaction
$2 NO left parenthesis straight g right parenthesis space plus space straight O subscript 2 left parenthesis straight g right parenthesis space space space rightwards arrow space space space 2 NO subscript 2 left parenthesis straight g right parenthesis comma$
calculate $increment straight G$ at 700K when enthalpy and entropy changes are -113 kJ mol^-1 and -145 JK^-1 mol^-1 respectively.

101 Views

269. The following data is known about ZnSO₄:

increment straight H space equals space 7.25 space kJ space mol to the power of negative 1 end exponent space and space increment straight S space equals space 7.0 space JK to the power of negative 1 end exponent space mol to the power of negative 1 end exponent

Calculate its melting point.

123 Views

Long Answer Type

270.

From the following values of ∆H and ∆S, decide whether or not these reactions will be spontaneous at 298 K:

Reaction A:
∆H = – 10.5 X 10³ J mol^–1∆S = + 31 JK^–1 mol^–1
Reaction B:
∆H = – 11.7 X 10³ J mol^–1 ;
∆S = –105 jK^–1 mol^–1.