A) 24,8 31. \( 49 \% 300 \mathrm{~g} \) sulfat kislota eritmasida 120 g. sulfat angdrid eritilishidan hosil bo lgan eritmadagi kislotaning foiz konsentratsiyasin aniqlang. \( \begin{array}{ll}\text { A) } 58,8 & \text { B) } 38\end{array} \)

1 ગ્રામ મોલ \( \mathrm{N}^{3-} \) આયન પરનો વીજભાર \( =\ldots \ldots \). કુંલબ \( \begin{array}{ll}\text { (a) } 2.89 \times 10^{5} & \text { (b) } 1.36 \times 10^{7} \\ \text { (c) } 3.36 \times 10^{2} & \text { (d) } 1.89 \times 10^{4}\end{array} \)

[3-520] The \( \mathrm{p}^{\mathrm{H}} \) value of a certain solution may vary by all the following, except..... a) adding acid or base to the solution. b) adding an extra amount from the same solution. c) evaporating a part of water (solvent) by heating without changing the amount of solute.

ग्लास घुलनशील है - (A) HF में (B) \( \mathrm{H}_{2} \mathrm{SO}_{4} \) में (C) \( \mathrm{HClO}_{4} \) में (D) अम्लराज में

Q1/ The half-life for a first-order reaction is 5 min . What was the origina concentration if, after 300 sec , the reactant concentration is 0.069 M ?

[3-692] A flask contains a sample of hydrated iron III chloride was heated strongly; if you know that the mas: of the hydrated salt in the flask is 10.7275 g and the mass of the flask empty is 9.375 g and the mass of the salt in the flask after heating is 10.1875 g , so the chemical formula of this salt is ...................