The component of air that removed when air is bubbled into alkaline pyrogallol solution is
carbon(lV) oxide
oxgyen
water vapour
nitrogen
helium
Correct answer is B
No explanation has been provided for this answer.
Which of the following substances is a peroxide?
Na2O2
CuO
Pb
Fe2O
AI2O
Correct answer is A
No explanation has been provided for this answer.
Which of the following indicates the correct increasing order of oxidizing power of the halogens?
F < CI < Br < l
l < Br < CI < F
I < CI < Br < F
Br < I < CI < F
CI < F < I < Br
Correct answer is B
No explanation has been provided for this answer.
600cm-3
800cm-3
1,000cm-3
3,600cm-3
4,000cm-3
Correct answer is D
\(400cm^{3} \to 2moldm^{-3}\)
\(0.4 dm^{3} \to 2moldm^{-3}\)
Multiplying in order to get the moles of the acid.
\(0.4dm^{3} \times 2moldm^{-3} = 0.8moles\)
After diluting to \(0.2moldm^{-3}\), the new volume will be
\(\frac{0.8}{0.2} = 4dm^{3}\)
Converting back to cm^3,
We have \(4 \times 1000cm^{3} = 4000cm^{3}\)
Hence, the volume of water added = \((4000 - 400)cm^{3} = 3600cm^{3}\)
The following gases decolorize bromine water except
C2H6
C2H4
C2H2
C3H4
C3H6
Correct answer is A
No explanation has been provided for this answer.