In context of the lanthanoids, which of the following statements is not correct ?(1) All the members exhibit +3 oxidation state(2) Because of similar properties the separation of lanthanoids is not easy.(3) Availability of 4f electrons results in the formation of compounds in +4 state for all the membersof the series.(4) There is a gradual decrease in the radii of the members with increasing atomic number in theseries.?????

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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