KVPY Government Jobs Exams

The number of air molecules in a (5m × 5m × 4m) room at standard temperature and pressure is of the order of

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PV = NKT
10^5 × 100 = N × 1.38 × 1023 × 273
N = 3 × 1027
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KVPY Other Question

A nucleus of lead 214 Pb82 emits two electrons followed by an alpha particle. The resulting nucleus will have
option
(A) 82 protons and 128 neutrons
(B) 80 protons and 130 neutrons
(C) 82 protons and 130 neutrons
(D) 78 protons and 134 neutrons Two balloons A and B containing 0.2 mole and 0.1 mole of helium at room temperature and 2.0 atm, respectively, are connected. When equilibrium is established, the final pressure of He in the system is
option
(A) 1.0 atm
(B) 1.5 atm
(C) 0.5 atm
(D) 2.0 atm