KVPY Government Jobs Exams

To obtain a diffraction peak, for a crystalline solid with interplane distance equal to the wavelength of
incident X-ray radiation, the angle of incidence should be
(A) 90º (B) 0º (C) 30º (D) 60º

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KVPY Other Question

When the size of a spherical nanoparticle decreases from 30 nm to 10nm, the ratio surface area/volume
becomes
(A) 1/3 of the original (B) 3 times the original
(C) 1/9 of the original (D) 9 times the original The standard Gibbs free energy change (ΔGº in kJ mol–1), in a Daniel cell ( Eº 1.1 V
cell = ), when 2 moles of
Zn(s) is oxidized at 298 K, is closest to
(A) – 212.3 (B) – 106.2 (C) – 424.6 (D) – 53.1