1000.00
100.00
10.00
0.01
Correct answer is D
Dilution factor = \(\frac{molar conc. of diluted}{molar conc. of undiluted}\)
= \(\frac{0.001}{0.1} = 0.01\)
Which of the following statements about endothermic reaction is correct?
Activation energy is high
A catalyst is required
It occurs reversibly
Heat energy is absorbed
Correct answer is D
Endothermic reactions are those reactions which absorb energy from the surroundings and result in a net decrease in temperature.
The use of diamond in abrasives is due to its
high melting point
hardness
octahedral shape
durability
Correct answer is B
Diamonds are very hard, they are often used as an abrasive.
The properties of a good primary standard include the following except
high molecular mass
low molecular mass
high degree of purity
readily available
Correct answer is B
Characters of a good primary standard include: high purity, low reactivity with the air or surrounding environment, low hygroscopicity, large molar mass, a predictable reactivity and readily available.
The bond angle in tetrahedral molecules such as tetrachloromethane is
180.0°
109.5°
105.5°
90.0°
Correct answer is B
No explanation has been provided for this answer.