Thermodynamics And Thermochemistry, Popular Questions: Jee Online course CHEMISTRY, Chemistry

Ketul asked a question

Subject: Chemistry, asked on on 30/6/17

The enthalpy of neutralization of acetic acid and sodium hydroxide is -55.4KJ. What is the enthalpy of ionisation of acetic acid?

Laiba asked a question

Subject: Chemistry, asked on on 15/4/18

For the formation of CH4 of delta U =-xKJ/mol then what will the value of delta H

Jasmine Kaur asked a question

Subject: Chemistry, asked on on 5/10/17

Three thermochemical equations are given below:

(i) C_{(g r a p h i t e)} + O_{2} (g) \to C O_{2} (g); △_{r} H ° = x k J m o l^{- 1} (i i) C_{(g r a p h i t e)} + \frac{1}{2} O_{2} (g) \to C O (g); △_{r} H ° = y k J m o l^{- 1} (i i i) C O (g) + O_{2} (g) \to C O_{2} (g); △_{r} H ° = z k J m o l^{- 1}

Based on the above equations, find out which of the relationship given below is correct:
(1) x = y - z
(2) z = x + y

Ragi Bhatt asked a question

Subject: Chemistry, asked on on 4/12/16

when 20ml of a strong acid is mixed to 20ml of strong alkali, the temp. rises by 10degree.
what wiould be the temp. rise if 200ml of each liquid are mixed??
1)5degree
2)10degree
3)0.5
4)0.10degree

Jasmine Kaur asked a question

Subject: Chemistry, asked on on 7/10/17

QUESTION NO 2

2. When an ideal gas is compressed adiabatically and reversibly, the final temperature is

(1) Higher than the initial temperature
(2) Lower than the initial temperature
(3) The same as the initial temperature
(4) Dependent on the rate of compression

Vortega asked a question

Subject: Chemistry, asked on on 23/11/16

Propane (C₃H₈₎ is used for heating water for domestic supply. assume that for 150kg of hot water supply per day must be heated from 10^oC to 65^oC. What moles of propane is used for heating this amount of water ?

(Delta_cH for propane = -2050 KJ/mol , c for water = 4.184 x 10^{-_{3 )}}

Vortega asked a question

Subject: Chemistry, asked on on 22/11/16

the enthalpy change for the reaction 2H₂ + O₂--> 2H²O is 574kJ . what is the heat of formation of water

Vortega asked a question

Subject: Chemistry, asked on on 23/11/16

derive the relation between change in internal energy and change in enthalpy for a system in which the reactants and products are gases

Pranay And Prachi asked a question

Subject: Chemistry, asked on on 5/8/17

Find the work done when 1 mole of hydrogen expands isothermally from 15 to 50 litres against a constant pressure of 1atm at 25C

Ragi Bhatt asked a question

Subject: Chemistry, asked on on 6/12/16

in which case entropy increases??
stretching of rubber band
combustion of methane gas
diamond----> graphite
all of these

Rutika Vitthal Marne. asked a question

Subject: Chemistry, asked on on 13/3/17

is it true that enthalpy of reaction is not same as heat of reaction

Henil asked a question

Subject: Chemistry, asked on on 11/1/17

the efficiency of a carnot engine having source temperature 127c and sink 27 c is

Yukta asked a question

Subject: Chemistry, asked on on 29/12/16

What is the meaning of thermodynamic function?

Laiba asked a question

Subject: Chemistry, asked on on 15/4/18

Q . ∆ S_{T o t a l} = - 40 k J / m o l \times K ∆ H_{s y s} = 2000 k J / m o l T = 400 K F i n d o u t v a l u e o f ∆ S_{s y s t e m} ?

Rutika Vitthal Marne. asked a question

Subject: Chemistry, asked on on 13/3/17

if deltaH depends on temperature how can we define any reaction to be spontaneous or not on the basis of temperature only by gibbs energy also if any reaction is not carried out at constant pressure what value is to be put in in gibbs equation

Jasmine Kaur asked a question

Subject: Chemistry, asked on on 7/10/17

QUESTION NO 22

22 . W h e n 1 g o f a n h y d r o u s o x a l i c a c i d i s b u r n t a t 25 ° C, t h e a m o u n t o f h e a t l i b e r a t e d i s 2.835 k J . ∆ H c o m b u s t i o n i s (o x a l i c a c i d : C_{2} H_{2} O_{4}) (1) - 255.15 k J (2) - 445.65 k J (3) - 295.24 k J (4) - 155.16 k J

Vatsala Hariharan asked a question

Subject: Chemistry, asked on on 14/5/18

An ideal gas expands in volume from 1 x 10^-3 m cube to 1x 10^-2 m cube at 300 K against a constant pressure of 1 x 10^5 N m^-2 . The work done is ? A) 270 kJ . B) -900 kJ . C) -900 J . D ) 900 kJ .

Jasmine Kaur asked a question

Subject: Chemistry, asked on on 5/10/17

QUESTION NO 11

Jasmine Kaur asked a question

Subject: Chemistry, asked on on 7/10/17

QUESTION NO 47

Jasmine Kaur asked a question

Subject: Chemistry, asked on on 5/10/17

QUESTION NO 17

Q17.

Given that C + O_{2} \to {CO}_{2}, ∆ H ° = - x KJ 2 CO + O_{2} \to 2 {CO}_{2}, ∆ H ° = - y KJ

what is heat of formation of CO?

(1)

\frac{y - 2 x}{2}

(2) 2 x – y
(3) y – 2x (4)

\frac{2 x - y}{2}

Abhishek Paul asked a question

Subject: Chemistry, asked on on 26/4/17

In alternative (c) why is it giving E1CB reaction even though Br- is not a strong base? Please explain in detail.

Yukta asked a question

Subject: Chemistry, asked on on 29/12/16

What is the difference between isothermal and adiabatic process? Please explain with examples.

Rutika Vitthal Marne. asked a question

Subject: Chemistry, asked on on 1/3/17

tis it true that no activation energy is needed at all for exothermic reaction since energy is liberated. It is been told to us as false if so there are many reaction in chemistry saying energy evolved in 1^streaction is used to carry out 2^nd reaction getting confused plzzz help

Ragi Bhatt asked a question

Subject: Chemistry, asked on on 6/12/16

for an isothermal expansion of an ideal gas
W=0
change in E=0
q=0
change in V=0

Jasmine Kaur asked a question

Subject: Chemistry, asked on on 7/10/17

QUESTION NO 4

Rutika Vitthal Marne. asked a question

Subject: Chemistry, asked on on 13/3/17

we define spontaneous reaction is reaction which takes place on its own without aid of any external reaction but also that endothermic reaction that absorbs energy AN EXTERNAL AID also spontaneous at higher temperature

Krithika Elancheran asked a question

Subject: Chemistry, asked on on 6/2/17

determine the enthalphy of combustion of CH4 at 298 K if the following is given C+O2=CO2 ; delta H=-393,H2+1+2(O2)=H2O;delta H=-285.8, CO2+2H2O=CH4+2O2;deltaH=890.3

Mehul Aswar asked a question

Subject: Chemistry, asked on on 4/12/16

PLEASE EXPLAIN 61 TH QUES

Rutika Vitthal Marne. asked a question

Subject: Chemistry, asked on on 9/3/17

if i try to solve it with equation deltaG =deltaH-TdeltaS option 4 is correct but in same equation i put T=0 option 3 is correct getting confused

Mehul Aswar asked a question

Subject: Chemistry, asked on on 4/12/16

PLEASE EXPLAIN 58TH QUES

Anubhav Das asked a question

Subject: Chemistry, asked on on 14/1/17

in zeroth law of thermodynamic can we state thermal equilibrium as dyanamic equlibrium?

Jaya Gupta asked a question

Subject: Chemistry, asked on on 6/6/17

Test question

Mehul Aswar asked a question

Subject: Chemistry, asked on on 4/12/16

PLEASE EXPLAIN 56TH

Abhishek Paul asked a question

Subject: Chemistry, asked on on 17/4/17

Question-

Rutika Vitthal Marne. asked a question

Subject: Chemistry, asked on on 16/5/17

in Q. 52 the answer given is C but i am getting the answer is like A . explain why