Which is not true according to VBT –

a) A covalent bond is formed by the overlapping of orbitals with unpaired electrons of opposite spins.
b) A covalent bond is formed by the overlapping of orbitals with unpaired electrons of same spin
c) The greater the extent of overlapping the stronger is the bond
d) Overlapping takes place of only in the direction of maximum electron density of the orbital.

in a physics laboratory a block x is balanced by a block Y of mass 200 kg,each are suspended from a balance of equal lever arms .the scale pan on X is at a height.H1=2 cm ,where as scale pan on Y is at height 1 cm above the floor.the error in weighing is (in gram)

consider the figure of a single riveted lap joint as follows

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cyclic heat engine operates between. temperature of 30 C. What is the least rate of heat rejection per kW net output of an engine. source temperature of 800 C and sink

 

 

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