39.3dm 3
22.4dm3
4.93dm3
3.93dm3
0.393dm3
Correct answer is D
V\(_1\) = 2.12dm\(^3\), V\(_2\) = ?
P\(_1\) = 205.2 x 10\(^3\) Nm\(^{-2}\), P\(_2\) = 101.3 x 10\(^3\) Nm\(^{-2}\)
T\(_1\) = 293K, T\(_2\) = 273K
Using \(\frac{P_1 * V_1}{T_1}\) = \(\frac{P_2 * V_2}{T_2}\)
: V\(_2\) = \(\frac{P_1 * V_1 * T_2}{P_2 * T_1}\)
→ \(\frac{205.2 x 10^3 * 2.12 * 273}{101.3 x 10^3 * 293}\)
= 4.0dm\(^3\)
The following are s-block elements except
lithium
magnesium
potassium
calcium
aluminium
Correct answer is E
No explanation has been provided for this answer.
1/2 x 6.02 x 10 23
1 x 6.02 x10 23
2 x 6.02 x 10 23
3x 6.02 x 10 23
4x 6.02 x 10 23
Correct answer is B
No explanation has been provided for this answer.
Which of the following is used extensively in manufacturing photographic chemicals?
Aluminium chloride
Zinc chloride
Silver chloride
Mercury (ll) chloride
lron (ll) chloride
Correct answer is C
No explanation has been provided for this answer.
1.00
0.40
0.20
0.10
0.01
Correct answer is D
No explanation has been provided for this answer.
Octane number is highest in petrol containing a high proportion of
heptane
octane
2-methylpentane
2, 4-dimethylpentane
2,2,4-trimethylpentane
Correct answer is E
No explanation has been provided for this answer.
using Zinc powder instead of Zinc granules
using dilute instead of concentrated hydrochloric acid
cooling the container in which the mixture is placed
using an alloy of zinc instead of pure zinc
using hydrogen chloride gas instead of hydrochloric acid solution
Correct answer is A
No explanation has been provided for this answer.
Pure sodium chloride does not conduct electricity
Potassium fluoride prevents the sodium produced from attacking the electrodes
Potassium fluride increases conductivity
Potassium fluride reduces the temperature at which sodium chloride fuses
the potassium fluride acts as a catalyst
Correct answer is D
No explanation has been provided for this answer.
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