For a hypothesis to be considered a valid scientific theory. It must a) summariz

Question

For a hypothesis to be considered a valid scientific theory. It must a) summarize data without trying to predict future results. b) be impossible to prove wrong by experiment. c) explain widely observed phenomena based on extensive testing. d) never be modified or expanded e) be voted on by the scientific community and accepted by all. Which of the following atoms or ions has a single unpaired electron? a) He b) Sr c) Al d) Na^+ e) Be In an experiment, hydrogen sulfide gas is collected in a 1.25 L flask at 21.0 degree C and 758 torr. How many grams of H_2 S are obtained? a) 39.3 g b) 24.7 g c) 1.36 g d) 0.0517 g e) 1.76 g If the absolute temperature of a gas is doubled and the pressure of the gas is halved, how will the volume change? a) It will increase by two times its original value. b) It will decrease to one fourth of its original value c) It will stay the same as its original value. d) It will Increase by four times its original value e) None of the above

Explanation / Answer

20 ans-

Al, due to electronic configuration of aluminium is 1s2 2s2 2p6 3s2 3p1. in outer most shell p-orbital has only one unpaired electron.

but in other option no any one unpaired eletron.

ques 22- ans- c

According to ideal gas equation PV= nRT so V = nRT/P , if we increase temperture double and pressure half then new volume V= nR.2T/(1/2)P = 4.nRT/P.

so ans is c) it will increase 4 times of original values.

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