2
3
4
6
Correct answer is A
From the reaction, the total charge on the left side = The total charge on the right side
-2 + 2 + y = -2 : y = -2 : y = 2
6.02 x 1022
6.02 x 1023
3.01 x 1023
1.51 x 1023
Correct answer is C
1 mole = Molar mass of gas = Avogadros number
32g of O2 = 6.02 x 1023
16g of O2 = x
x = \(\frac{16 \times 6.02 \times 10^23}{32}\) = 3.01 x 1023
1.12dm3
2.24dm3
3.72dm3
4.48dm3
Correct answer is B
\(\frac{\text{volume}}{\text{molar volume}}\) = 0.05
1 mole of ethane produces 2 moles of carbon(iv)oxide
∴ 0.05 mole of ethane will produce x moles of carbon(iv)oxide
= \(\frac{\text{volume}}{22.4}\) = 0.05 X 2 X 22.4 = 2.24dm\(_3\)
Which of the following trioxonitrate(V) salts would decompose on heating to form a metal?
Cu(NO3)2
AgNO3
Pb(NO3)2
KNO3
Correct answer is B
No explanation has been provided for this answer.
i
ii
i and ii
ii and iii
Correct answer is C
No explanation has been provided for this answer.