Knowing that the Chemistry of lanthanoids (Ln) is dominated by its +3 oxidation state, which of the following statements is incorrect ?(1) Because of the large size of the Ln (III) ions the bonding in its compounds is predominently ionic in character(2) The ionic sizes of Ln(III) decrease in general with increasing atomic number.(3) Ln (III) compounds are generally colourless.(4) Ln (III) hydroxides are mainly baisc in character.

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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