Detergents are better than soaps for laundry because
detergents are synthetic while soaps are not
detergents are more soluble in water than soaps
scum is precipitated when soaps are used with hard water but not with stergents
soaps from soluble saits with ions causing hardness of water while detergents do not
soaps are in bars while detergents are in powder form
Correct answer is C
No explanation has been provided for this answer.
A salt which loses mass when exposed to air is
hygroscopic
deliquescent
efflorescent
fluorescent
effervescent
Correct answer is C
No explanation has been provided for this answer.
The empirical formula of hydrocarbon containing 0. 12 mole of carbon and 0.36 mole of hydrogen is
CH2
CH3
C2H2
C2H4
C2H6
Correct answer is B
No explanation has been provided for this answer.
6.02 x 10 23
3.01 x 1022
6.02 x 1022
5. 08 x 1022
3.01 x 1022
Correct answer is C
27g Aluminium = \(6.02 \times 10^{23}\)
1g Al = \(\frac{6.02 \times 10^{23}}{27}\)
2.7g Al = \(\frac{6.02 \times 10^{23}}{27} \times 2.7\)
= \(6.02 \times 10^{22} Al \) atoms
Which of the following does not affect the rate of a chemical reaction?
Addition or presence of a catalyst
Size of the reacting particles
The enthalpy change for the reaction
Concentration of the reactants
Temperatureat which the reaction is carried out
Correct answer is C
No explanation has been provided for this answer.