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Questions asked by mosymeow_1
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I am a pale blue gas, dark blue liquid and violet-black solid. I am thermodynamically unstable with respect to oxygen. I am a powerful oxidising agent. If my concentration in air rises, your breathing becomes uncomfortable resulting in headache and nausea. WHO AM I?
tips-tricks-and-exam-hacks
who am i
asked
Feb 25, 2014
1
answer
Given $\Delta H^\circ _{ioniz}$ (HCN) = 45.2 kJ $mol^{-1}$ and $\Delta H^\circ _{ioniz} (CH_3COOH)$ = 2.1 kJ $mol^{-1}$. Which one of the following fact is true?
jeemain
chemistry
class11
unit6
chemical-thermodynamics
easy
asked
Feb 24, 2014
1
answer
The heat evolved in combustion of benzene is given by the following equation: $C_6H_6 + \frac{15}{2} \rightarrow 3H_2O + 6CO_2$; $\Delta H= - 3264.6 kJ$ Which of the following quantities of heat will be evolved when 39 g of benzene are burnt in an open container?
jeemain
chemistry
class11
unit6
chemical-thermodynamics
difficult
asked
Feb 24, 2014
1
answer
The heat change for the following reaction at 298 K and constant pressure is +7.3 kcal. $A_2B(s) \rightarrow 2A(s) + \frac{1}{2} B_2(g)$; $\Delta H = + 7.3 kcal$ The heat change at constant volume would be
jeemain
chemistry
class11
unit6
chemical-thermodynamics
difficult
asked
Feb 24, 2014
1
answer
The enthalpy change at 298 K of the reaction $H_2O_2(l) \longrightarrow H_2O (l) + \frac{1}{2} O_2 (g)$ is -23.5 kcal $mol^{-1}$ and enthalpy of formation of $H_2O_2(l)$ is -44.8 kcal $mol^{-1}$. The enthalpy of formation of $H_2O(l)$ is
jeemain
chemistry
class11
unit6
chemical-thermodynamics
difficult
asked
Feb 24, 2014
1
answer
The work done on the system when one mole of an ideal gas at 500 K is compressed isothermally and reversibly to 1/10th of its original volume (R = 2 cal)
jeemain
chemistry
class11
unit6
chemical-thermodynamics
difficult
asked
Feb 24, 2014
1
answer
An ideal gas expands from $10^{-3} m^3$ to $10^{-2} m^3$ at 300 K, against a constant pressure of $10^5 N m^{-2}$. The work done on it is
jeemain
chemistry
class11
unit6
chemical-thermodynamics
easy
asked
Feb 24, 2014
1
answer
For the reaction between $CO_2$ and graphite $CO_2(g) + C(s) \longrightarrow 2CO(g)$ $\Delta H = +170.0 kJ$ and $\Delta S = 170 JK^{-1}$. The reaction is spontaneous at
jeemain
chemistry
class11
unit6
chemical-thermodynamics
medium
asked
Feb 24, 2014
1
answer
An engine operating between $100^\circ C$ and $0^\circ C$ takes 453.6 Kcal of heat. How much useful work can be done by it?
jeemain
chemistry
class11
unit6
chemical-thermodynamics
medium
asked
Feb 24, 2014
1
answer
What percent $T_1$ is of $T_2$ for a heat engine whose efficiency is 10%?
jeemain
chemistry
class11
unit6
chemical-thermodynamics
easy
asked
Feb 24, 2014
1
answer
The heat change at constant volume for the decomposition of silver(I) oxide is found to be 30.66 kJ. The heat change at constant pressure will be
jeemain
chemistry
class11
unit6
chemical-thermodynamics
difficult
asked
Feb 24, 2014
1
answer
At 298 K, the enthalpy change for a given reaction K is $-x$ cal/mol. If the reaction occurs spontaneously at 298 K, the entropy change at that temperature
jeemain
chemistry
class11
unit6
chemical-thermodynamics
easy
asked
Feb 24, 2014
1
answer
For the following thermodynamic process Dry ice $\longrightarrow CO_2$ (g)
sat
chemistry
chemical-reactions-and-thermochemistry
jeemain
class11
unit6
chemical-thermodynamics
easy
asked
Feb 24, 2014
2
answers
The sign of $\Delta G$ for the process of melting of ice at 273 K and 1 atm pressure is
jeemain
chemistry
class11
unit6
chemical-thermodynamics
easy
asked
Feb 24, 2014
1
answer
According to third law of thermodynamics, the entropy at 0 K is zero for
jeemain
chemistry
class11
unit6
chemical-thermodynamics
easy
asked
Feb 24, 2014
2
answers
The value of $\Delta S$ is negative in which of the following process?
sat
chemistry
chemical-reactions-and-thermochemistry
jeemain
class11
unit6
chemical-thermodynamics
easy
asked
Feb 24, 2014
2
answers
For the gaseous reaction involving the complete combustion of isobutane
jeemain
chemistry
class11
unit6
chemical-thermodynamics
medium
asked
Feb 24, 2014
1
answer
Enthalpy of neutralisation of all strong acids and strong bases has the same value because
jeemain
chemistry
class11
unit6
chemical-thermodynamics
easy
asked
Feb 23, 2014
1
answer
One gram of diamond atom of graphite and one gram atom of diamond were separately burnt to carbon dioxide. The amount of heat liberated were 393.5 kJ and 395.4 kJ respectively. It follows that
jeemain
chemistry
class11
unit6
chemical-thermodynamics
easy
asked
Feb 23, 2014
1
answer
X gm of ethanal was subjected to combustion in a bomb calorimeter. The heat produced is Y joules. Then
jeemain
chemistry
class11
unit6
chemical-thermodynamics
medium
asked
Feb 23, 2014
1
answer
The reaction $SO_2(g) + \frac{1}{2} O_2 (g) \longrightarrow SO_3(g)$ should be
jeemain
chemistry
class11
unit6
chemical-thermodynamics
easy
asked
Feb 23, 2014
1
answer
Which of the following relationship is not correct?
jeemain
chemistry
class11
unit6
chemical-thermodynamics
easy
asked
Feb 23, 2014
1
answer
At constant volume the heat of combustion of solid benzoic acid is -321.30 kJ at $27^\circ C$. The heat of combustion at constant pressure is
sat
chemistry
chemical-reactions-and-thermochemistry
jeemain
class11
unit6
chemical-thermodynamics
easy
asked
Feb 23, 2014
1
answer
What is observed during isothermal expansion of an ideal gas?
jeemain
chemistry
chemical-thermodynamics
medium
asked
Feb 23, 2014
1
answer
When is the efficiency of a heat engine maximum?
jeemain
chemistry
chemical-thermodynamics
easy
asked
Feb 23, 2014
1
answer
Identify the correct order of solubility of $Na_2S, CuS$ and $ZnS$ in aqueous solution
jeemain
chemistry
practical-chemistry
medium
asked
Feb 1, 2014
1
answer
The reagent $NH_4Cl$ and aqueous $NH_3$ will precipitate
jeemain
chemistry
practical-chemistry
medium
asked
Feb 1, 2014
1
answer
Potassium ferrocyanide is used in the detection of
jeemain
chemistry
practical-chemistry
medium
asked
Feb 1, 2014
1
answer
A red solid is insoluble in water. However, it becomes soluble if some KI is added to water. Heating red solid in a test tube produces violet coloured fumes and droplets of metal appear on the cooler parts of test tube. The red solid is
jeemain
chemistry
practical-chemistry
medium
asked
Feb 1, 2014
1
answer
Which of the following metal sulphides has maximum solubility in water?
jeemain
chemistry
practical-chemistry
medium
asked
Feb 1, 2014
1
answer
When chlorine water is added to an aqueous solution of potassium halide in the presence of chloroform, a violet colour is obtained. On adding more of chlorine water, the violet colour disappears, and a colourless solution is obtained. This test confirms the presence of the following in aqueous solution.
jeemain
chemistry
practical-chemistry
medium
mock
asked
Feb 1, 2014
1
answer
Iodine reacts with $Na_2S_2O_3$ (aq) to give products which are
jeemain
chemistry
practical-chemistry
medium
asked
Feb 1, 2014
1
answer
Lead has been placed in the group I and II because
jeemain
chemistry
practical-chemistry
medium
asked
Feb 1, 2014
1
answer
Suspended impurities from a colloidal solution of gum in water can be removed by
jeemain
chemistry
practical-chemistry
medium
asked
Feb 1, 2014
1
answer
Which of the following can be enthalpy of neutralisation of a weak acid and a strong base?
jeemain
chemistry
practical-chemistry
medium
asked
Feb 1, 2014
1
answer
If enthalpy of neutralisation of $dil\; HCl$ and $NaOH\; (aq)$ is $x$ then enthalpy of neutralisation of dil HI and $Ba(OH)_2\; (aq)$ is
jeemain
chemistry
practical-chemistry
medium
asked
Feb 1, 2014
1
answer
Which of the following precipitates $K^+$ from its solution?
jeemain
chemistry
practical-chemistry
medium
asked
Feb 1, 2014
1
answer
Which of the following is insoluble in dil. $HNO_3$ but soluble in aqua regia?
jeemain
chemistry
practical-chemistry
medium
asked
Feb 1, 2014
1
answer
When $H_2S$ is passed through an ammoniacal salt solution X, a white ppt. is obtained. Then X can be a
jeemain
chemistry
practical-chemistry
medium
asked
Feb 1, 2014
1
answer
Distinguishing reagent between silver and lead salts
jeemain
chemistry
practical-chemistry
medium
asked
Feb 1, 2014
1
answer
$H_2S$ in the presence of HCl precipitates group II but not group IV because
jeemain
chemistry
practical-chemistry
medium
asked
Feb 1, 2014
1
answer
Concentrated nitric acid is added before proceeding to test for group III members. This is to
jeemain
chemistry
practical-chemistry
medium
asked
Feb 1, 2014
1
answer
Mg is not precipitated in group V because
jeemain
chemistry
practical-chemistry
medium
asked
Feb 1, 2014
1
answer
The ion that cannot be precipitated by both HCl and $H_2S$ is
jeemain
chemistry
practical-chemistry
medium
asked
Feb 1, 2014
1
answer
Which of the following solution gives precipitate with $Pb(NO_3)_2$ but not with $Ba(NO_3)_2$ ?
jeemain
chemistry
practical-chemistry
medium
asked
Feb 1, 2014
1
answer
An aqueous solution of salt gives white precipitate with $AgNO_3$ solution as well as with dil $H_2SO_4$. It may be
jeemain
chemistry
practical-chemistry
medium
asked
Feb 1, 2014
1
answer
In a mixture having nitrite and nitrate can be destroyed by heating with
jeemain
chemistry
practical-chemistry
medium
asked
Feb 1, 2014
1
answer
For the test of halides, the soda extract is acidified with
jeemain
chemistry
practical-chemistry
medium
asked
Feb 1, 2014
1
answer
Formation of purple colour on the addition of sodium nitroprusside to sodium carbonate extract indicates the presence of
jeemain
chemistry
practical-chemistry
medium
asked
Feb 1, 2014
2
answers
A salt solution is acidified with dil. $HCl$ and $BaCl_2$ solution is added. A white ppt. is formed. The salt contains
jeemain
chemistry
practical-chemistry
medium
asked
Feb 1, 2014
1
answer
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