A substance that is used as a ripening agent for fruits is
ethene
propane
methane
butane
Correct answer is A
No explanation has been provided for this answer.
0.89 mol
1.90 mol
3.80 mol
5.70 mol
Correct answer is A
No explanation has been provided for this answer.
negative
zero
positive
indeterminate
Correct answer is A
\(\begin{array}{c|c}
\text{Enthalpy Change [ΔH]} & \text{Entropy Change [ΔS]} & \text{Gibbs free Energy[ΔG]} \\
\hline
\text{Positive} & \text{Positive} & \text{depends on T, may be + or -} \\ \hline \text{Negative} & \text{Positive} & \text{always negative} \\ \hline \text{Negative} & \text{Negative} & \text{depends on T, may be + or -} \\ \hline \text{Positive} & \text{Negative} & \text{always positive} \end{array}\)
ΔG= ΔH − TΔS.
To determine whether ΔG will be positive or negative, the value of ΔH(change in enthalpy) and ΔS (change in entropy) must be given. Likewise the temperature.
Ca(OH)2(s) + 2NH4Cl(s) → CaCl2(s) + 2H2O(l) + X. In the reaction above X is
NO2
NH3
N2O
NO2
Correct answer is B
Balancing the chemical equation.
Ca[OH]2 + 2NH4Cl → CaCl2 + 2H2O + 2NH3
X = NH3
Water for town supply is chlorinate to make it free from
bad colour
bacteria
temporary hardness
permanent hardness
Correct answer is B
Chlorine helps to keep water from germs and bacteria.