0.90 atm
0.80 atm
0.70 atm
0.60 atm
Correct answer is A
Total no mole = 0.2 + 0.2 + 0.3 = 0.7
Partial pressure of He = (0.3)/(0.7) x 2.1 =0.90
34.0
31.0
20.0
14.0
Correct answer is B
Molecular Mass = Vapour density x 2 = 17.0 x 2 = 34.0
∴ Relative Atomic Mass of X in XH3 = 34 - 3
= 31.0 ∴ x = 31.0
constant composition
conservation of mass
reciprocal proportions
multiple proportions
Correct answer is D
No explanation has been provided for this answer.
11%
31%
35%
69%
Correct answer is B
Reaction for the equation:
\(2H_{2} + O_{2} \to 2H_{2} O\)
\(2 vol : 1 vol : 2 vol\)
Hence, 2 volumes of Hydrogen is needed for the reaction with Oxygen to produce steam (water).
\(\therefore 12cm^{3} O_{2} \to 2 \times 12cm^{3} = 24cm^{3} H_{2}\)
\(\text{Excess of Hydrogen} : 35 cm^{3} - 24 cm^{3} = 11 cm^{3}\)
\(\text{% Hydrogen left after the reaction} = \frac{11}{35} \times 100% = \frac{220}{7} = 31.48% \)
\(\approxeq 31% \)
The relatively high boiling points of alkanols are due to?
ionic bonding
aromatic character
covalent bonding
hydrogen bonding
Correct answer is D
No explanation has been provided for this answer.