When the temperature of an ideal gas is increased from 27°C to 927°C, the kinetic energy will be

• same

• eight times

• four times

• twice

Ratio of radii of second and first Bohr orbits of H atom is

• 2

• 4

• 3

• 5

India conducted an underground nuclear test at

• Narora

• Tarapur

• Pushkar

• Pokharan

The incorrect configuration is

• K = [Ar] 4s¹

• Cr= [Ar] 3d⁵ ,4s¹

• Cr= [Ar] 3d⁴ , 4s¹

• Cu= [Ar]3d¹⁰ ,4s¹

Dual nature of particle was-given by

• Bohr theory

• Thomson model

• Heisenberg principle

• de-Broglie equation

NaOH(aq), HCl(aq), and NaCl(aq) concentration of each is 10^-3 M. Their pH will be respectively

• 10, 6, 2

• 11, 3, 7

• 10, 3, 7

• 10, 4, 7

17.

Graphite is soft while diamond is hard because

• graphite is in powder form

• diamond has sp² hybridisation but graphite has sp³ hybridisation

• graphite is in planar form while diamond is in tetrahedral form

• graphite is covalent and diamond is ionic

Na₂S₂O₃ + I₂ $\to$ Product is

• Na₂S

• Na₂SO₄

• Na₂S₄O₆

• S₂

H₂O is liquid while H₂S is a gas due to

• covalent bonding

• molecular attraction

• H-bonding

• both H-bonding and molecular attraction

The hardest substance is

• iron

• steel

• diamond

• graphite