The coagulation of 10 mL of a colloidal sol of gold is completely prevented by addition of 0.25 g of a substance X to it before adding 1 mL of 10% NaCl solution. The gold number of X is

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Chandan Asked Sep 15, 2023

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61.25% (w/w) H2SO4 stock solution has a density of $1.6 g mL ^{-1}$. The molecular weight of H2SO4 is $98 g mol ^{-1}$. The volume $( mL )$ of stock solution required to prepare a 200 mL solution of 0.3 M H2SO4 is :

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25.4g of iodine and 14.2g of chlorine are made to react completely to yield a mixture of ICl and ICl3.

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Calculate the molality of the resultant solution, obtained by mixing equal volumes of 20 % (w/w) NaOH solution (d=1.2 g / mL ) and 25 %(w / w) NaOH solution (d=1.44 g / mL ). Report your answer after multiplying it by 3.4 :

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0.218 g of magnesium when dissolved in dilute HCl evolved 218.2 mL of hydrogen at $17^{\circ} C$ and 754.5 mm collected over water.

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The density of water at room temperature is 1.0 g/mL. How many molecules are there in a drop of water if its volume is 0.05 mL ?

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300 ml of 3.0 M NaCl solution is added to 200 ml of 4.0 M BaCl2 solution. The concentration of Cl− ions in the resulting solution is —

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For the elementary reaction $M \rightarrow N$, the rate of disappearance of M increases by a factor of 8 upon doubling the concentration of M. The order of the reaction with respect to M is

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Let $f:[0,4 \pi] \rightarrow[0, \pi]$ be defined by $f(x)=\cos ^{-1}(\cos x)$. The number of points $x \in[0,4 \pi]$ satisfying the equation $f(x)=\frac{10-x}{10}$ is

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The coagulation of 10 mL of a colloidal sol of gold is completely prevented by addition of 0.25 g of a substance X to it before adding 1 mL of 10% NaCl solution. The gold number of X is

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