AIEEE Exam

How many unit cells are present in a cube-shaped
ideal crystal of NaCl of mass 1.00 g ?
[Atomic mass : Na = 23, Cl = 35.5]

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AIEEE Other Question

X ml of H2 effuse out through a hole in a
container in 5 seconds. The time taken for the
effusion of the same volume of the gas specified
below under identical conditions is –
(A) 10 sec. ; H2 (B) 20 sec.; O2
(C) 25 sec.; CO (D) 55 sec.; CO2 The vapour pressures of the two liquids ‘P’ and
‘Q’ are 80 and 60 torr respectively. The total
vapour pressure of the solution obtained by
mixing 3 moles of P and 2 moles of Q would be
(A) 68 torr (B) 140 torr
(C) 72 torr (D) 20 torr