A piston filled with 0.04 mol of an ideal gas expands reversibly from 50.0 mL to 375 mL at a constant temperature of 37.0⁰C. As it does so, it absorbs 208J of heat. The values of q and w for the process will be:(R = 8.314 J/mol K) ( ln 7.5 = 2.01)

• q =+208J, W = - 208 J

• q =-208 J, W =-208 J

• q=-208J, W = +208 J

• q =+208 J, W = +208 J

For the gaseous state, if most probable speed is denoted by C*, average speed by C and mean square speed by C, then for a large number of molecules the ratios of these speeds are:

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• 
• 
• 

C.

A gaseous hydrocarbon gives upon combustion 0.72 g of water and 3.08 g of CO₂.The empirical formula of the hydrocarbon is 

• C₂H₄

• C₃H₄

• C₆H₅

• C₇H₈

In which of the following pairs of molecules/ions, both the species are not likely exist?

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• 
• 
• 

C.

species which have zero or negative bond order does not exist.

Which of the following exists as covalent crystals in the solid state?

• Iodine

• Silicon

• Sulphur

• Phosphorus