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Chemistry-XI/XII

 
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Rhythm posted a video:
30 Jul, 2014 3:48 PM

In an atom which has 2K,8L,18M and 2N electrons in ground state. The total no of electrons having magnetic quantum no.,m=0 is???

 

21 Jul, 2014 5:25 PM

In Mg atom, in ground state,the no. of electrons with m=0 is???

(m= magnetic quantum no.)

21 Jul, 2014 5:22 PM

the ionization energy of he+ is 19.6x 10-18 J\atm. The energy of the 1st stationary state of Li2+ is???

21 Jul, 2014 5:20 PM

P4O10 is the anhydride of [West Bengal JEE 2010]

A

H3PO2

B

H3PO3

C

H3PO4

D

H4P2O7


19 Jul, 2014 5:18 PM
Rhythm posted a video:
19 Jul, 2014 11:05 AM

An ideal gas is allowed to expand both reversibly and irreversibly in an isolated system. If Ti is the initial temperature and Tf is the final temperature, which of the following statements is correct? [AIEEE 2006]

A

(Tf)irrev > (Tf)rev

B

Tf > Ti for reversible process but Tf = Ti for irreversible process

C

(Tf)rev = (Tf)irrev

D

Tf = Ti for both reversible and irreversible processes

 

18 Jul, 2014 4:34 PM

The enthalpy of fusion of water is 1.435 kcal/mol. The molar entropy change for the melting of ice at 0°C is [CBSE AIPMT 2012]

A

5.260 cal/(mol K)

B

0.526 cal/(mol K)

C

10.52 cal/(mol K)

D

21.04 cal/(mol K)

18 Jul, 2014 10:13 AM
One mole of oxygen at 273 k and one mole of sulphur dioxide at 546 k are taken in two separate containers, then,
A
kinetic energy of O2 > kinetic energy of SO2 .
B
kinetic energy of O2 < kinetic energy of SO2.
C
kinetic energy of both are equal.
D
None of these
 
16 Jul, 2014 3:49 PM
In a flask of ‘V’ litres, 0.2 moles of O2, 0.4 moles of N2, 0.1 moles of NH3 and 0.3 moles of He gases are present at 27°C. If total pressure exerted by these non-reacting gases is 1 atm, the partial pressure exerted by N2 gas is
A
0.4 atm
B
0.3 atm
C
0.2 atm
D
0.1 atm
16 Jul, 2014 3:49 PM