1 gram of a carbonate (M₂CO₃) on treatment with excess HCl produces 0.01186 moles of CO₂. The molar mass of M₂CO₃ in g mol^–1 is:

1. 118.6

2. 11.86

3. 88.6

4. 84.3

A gaseous hydrocarbon upon combustion gives 0.72 g of water and 3.08 g. of CO₂. The empirical formula of the hydrocarbon is:

What is the ratio of the number of molecules of oxygen to nitrogen in a specific gaseous mixture if their mass ratio is 1:4?

The molarity of a solution obtained by mixing 750 mL of 0.5M HCl with 250 ml of 2M HCl will be:

1. 1.75 M

2. 0.975 M

3. 0.875 M

4. 1.00 

The molecular formula of a commercial resin used for exchanging ions in water softening is ${\mathrm{C}}_8{\mathrm{H}}_7{\mathrm{SO}}_3\mathrm{Na}<mspace\; width="1em"></mspace>\left(\mathrm{Mol}.<mspace\; width="1em"></mspace>\mathrm{Wt}.<mspace\; width="1em"></mspace>206\right)$. The maximum uptake of ${\mathrm{Ca}}^{2+}$ ions by the resin when expressed in mole per gram resin is:
\( \mathrm{C}_8 \mathrm{H}_7 \mathrm{SO}_3 \mathrm{Na}+\mathrm{Ca}^{2+} \rightarrow (\mathrm{C}_8 \mathrm{H}_7 \mathrm{SO}_{3}){_2} \mathrm{Ca}+ \mathrm{Na}^{+}\)

1. $\frac{1}{103}$

2. $\frac{1}{206}$

3. $\frac{2}{309}$

4. $\frac{1}{412}$

3 g of activated charcoal was added to 50 mL of acetic acid solution (0.06N) in a flask. After an hour it was filtered and the strength of the filtrate was found to be 0.042 N. The amount of acetic acid adsorbed (per gram of charcoal) is :

1.  18 mg

2.  36 mg

3.  42 mg 

4.  54 mg

The mass of potassium dichromate crystals required to oxidize 750 cm³ of 0.6 M Mohr's salt solution is:
(Given molar mass: potassium dichromate = 294, Mohr's salt = 392)

1. 0.45 g

2. 22.05 g

3. 2.2 g

4. 0.49 g

Which of the following statements is true regarding the reaction given below?
\(2 \mathrm{Al}_{(\mathrm{s})}+6 \mathrm{HCl}_{(\mathrm{aq})} \rightarrow 2 \mathrm{Al}^{3+}{ }_{(\mathrm{aq})}+6 \mathrm{Cl}^{-}(\mathrm{aq})+3 \mathrm{H}_2(\mathrm{~g})\)

0.4 g mixture of NaOH, Na₂CO₃ and some inert impurities was first titrated with $\frac{N}{10}$ HCl using phenolphthalein as an indicator, 17.5 mL of HCl was required at the end point. After his methyl orange was added and titrated. 1.5 mL of same HCl was required for the next end point. The weight percentage of Na₂CO₃ in the mixture is- (Rounded-off to the nearest integer)

1. 6 %
2. 4 %
3. 7 %
4. 9 %

A solution of phenol in chloroform when treated with aqueous NaOH gives compound P as a major product. The mass percentage of carbon in P is:
(to the nearest integer) (Atomic mass : C =12; H=1; O=16)