1.0 x 1021
6.6 x 1021
2.0 x 1022
1.0 x 1022
5.4 x 1023
Correct answer is C
1 Mole or 27 gms of Al contains 6 x 1021 atoms
0.9 gms of Al will contain (6 x 1023 x 0 g)/(27 1) = 0.2 x 1023 or 1022
Copper
Iron
Lead
Potassium
Zinc
Correct answer is D
No explanation has been provided for this answer.
both gases change the colour of the solution from yellow to colourless
both gases causes sulphur to be deposited
only hydrogen sulphide decolourizes the solution
only sulphur dioxide deposits sulphur
only hydrogen sulphide deposits sulphur
Correct answer is E
No explanation has been provided for this answer.
Which of the following compounds and elements would sublime on exposure to the atmosphere?
Ice
Sulphur
Phosphurous
Iodine
Potassium iodie
Correct answer is D
No explanation has been provided for this answer.
10.6 g
5.3 g
500 g
10 g
20 g
Correct answer is B
106 gm Na2CO3 in 1000 cc = 1m
53 gm Na2CO3 in 500 cc = 1m
For 0.1 molar we have (53)/(10) = 5.3