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Chemistry-XI/XII

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

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???

 
Jul 21, 2014 5:25 PM
Shivani Malik

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

(m= magnetic quantum no.)
Jul 21, 2014 5:22 PM
Shivani Malik

the ionization energy of he+ is 19.6x 10-18 J\atm. The energy of the 1st stationary state of Li2+ is???
Jul 21, 2014 5:20 PM
Rhythm

P4O10 is the anhydride of [West Bengal JEE 2010]

A

H3PO2
B

H3PO3
C

H3PO4
D

H4P2O7
Jul 19, 2014 5:18 PM
Rhythm posted a video:
Jul 19, 2014 11:05 AM
Rhythm

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

 
Jul 18, 2014 4:34 PM
Rhythm

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)
Jul 18, 2014 10:13 AM
Rhythm
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
 
Jul 16, 2014 3:49 PM
Rhythm
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
Jul 16, 2014 3:49 PM