Percentage Composition

Q.

The brown ring complex compound is formulated as $\left[\mathrm{Fe}{\left({\mathrm{H}}_2\mathrm{O}\right)}_5\mathrm{NO}\right]{\mathrm{SO}}_4$. The oxidation state of Iron is ?

1. $+1$

2. $+2$

3. $+3$

4. $+6$

Q. What is the molarity of $H_{2}S{O}_4$ solution, that has a density $1.84\text{g/cc}$ at $35{}^{\circ }C$ and contains $98\%$ by weight?

1. $18.4\text{M}$
2. $18\text{M}$
3. $4.18\text{M}$
4. $8.14\text{M}$

Q.

Calculate the percentage of nitrogen present in urea?

1. 16.3

2. 38.4

3. 46.6

4. 59.1

Q.

The molarity of pure water is

1. $18.36\mathrm{M}$

2. $1.16\mathrm{M}$

3. $55.56\mathrm{M}$

4. $5.56\mathrm{M}$

Q.

The average atomic mass of magnesium is $24.31\mathrm{amu}$ this magnesium is composed of $79\mathrm{mole}\%\mathrm{of}{}_{24}\mathrm{Mg}$ and remaining $21\mathrm{mole}\%\mathrm{of}{}_{25}\mathrm{Mg}\mathrm{and}{}_{26}\mathrm{Mg}$. Calculate mole $\%\mathrm{of}{}_{26}\mathrm{Mg}?$

Q. The molarity of a solution obtained by mixing 750 mL of 0.5M $HCl$ with 250 mL of 2M $HCl$ will be

1. 0.875 M
2. 1.00 M
3. 1.75 M
4. 0.975 M

Q.

Calculate the percentage of sulphur present in sulphuric acid (H₂SO₄₎.

Q. 2.5 litre of 1 M NaOH solution is mixed with another 3 litre of 0.5 M NaOH solution. Then find out molarity of resultant solution:

1. 0.73 M
2. 0.80 M
3. 0.50 M
4. 1.0 M

Q. In the Haber’s process, 30 L of hydrogen and 30 L of nitrogen were taken for the reaction, which yielded only 50% of the expected product. What will be the composition of the gaseous mixture under the aforementioned condition after reaction is completed?

1. 20 litres ammonia, 20 litres nitrogen, 20 litres hydrogen
2. 10 litres ammonia, 25 litres nitrogen, 15 litres hydrogen
3. 20 litres ammonia, 10 litres nitrogen, 30 litres hydrogen
4. 20 litres ammonia, 25 litres nitrogen, 15 litres hydrogen

Q.

Calculate the molecular mass of:

Washing soda ${\mathrm{Na}}_2{\mathrm{CO}}_3.10{\mathrm{H}}_2\mathrm{O}$

Q.

The strengths of $5.6$ volume hydrogen peroxide (of density $1\mathrm{g}/\mathrm{mL}$) in terms of mass percentage and molarity $\left(\mathrm{M}\right)$, respectively, are: (Take the molar mass of hydrogen peroxide as $34\mathrm{g}/\mathrm{mol}$)

1. $0.85\mathrm{and}0.5$

2. $0.85\mathrm{and}0.25$

3. $1.7\mathrm{and}0.25$

4. $1.7\mathrm{and}0.5$

Q.

If 250 cm³ of an aqueous solution containing 0.73 g of protein A is isotonic with one liter of another aqueous solution containing 1.65 g of a protein B, at 298 K, the ratio of the molecular masses of A and B is ______ × 10^–2 (to the nearest integer).

Q. Carbon occurs in nature as a mixture of carbon-12 and carbon-13. The average atomic mass of carbon is 12.011. What is the percentage abundance of carbon-12 in nature?

1. 98.90 %
2. 54.40 %
3. 65.78%
4. 78.99 %

Q.

How is Sulfur estimated by Carius method?

Q.

An Oxide of a Metal (M) contains 40% by mass of Oxygen. Metal (M) has atomic mass of 24.The empirical formula of the oxide Is :

1. MO

2. M₂O

3. M₂O₃

4. M₃O₄

Q.

What is the mass per cent of carbon in carbon dioxide ?

(a) 0.034% (b) 27.27% (c) 3.4% (d) 28.7%

Q.

$6.023\times {10}^{22}$ molecules are present in $10g$ of a substance $x$. The molarity of a solution containing $5g$ of substance $x$ in $2L$ solution is _____ $\times {10}^{-3}$.

Q. The solubility of AgCl of water at ${25}^{\circ }$ C is $1.79\times {10}^{-3}$ g/lit. Calculate $\left(K_{sp}\right)$ AgCl at ${25}^{\circ }C.$

1. 
2. 
3. 
4. 

Q.

In the estimation of sulphur by Carius method, 0.468 g of an organic sulphur compound afforded 0.668 g of barium sulphate. Find out the percentage of sulphur in the given compound.

Q. What volume of $96\%$ $H_{2}S{O}_4$ solution $\left(\text{density}1.83\text{g/mL}\right)$ is required to prepare $4\text{liter}$ of $3.0\text{M}$ $H_{2}S{O}_4$ solution?

1. $669.39\text{mL}$
2. $700.00\text{mL}$
3. $500.50\text{mL}$
4. $600.45\text{mL}$

Q.

What Is N/10 HCl Solution?

Q. Concentrated aqueous sulphuric acid is $98\%$ $H_{2}S{O}_4$ by mass and has a density of $1.80gm{L}^{-1}.$ Volume of acid required to make $1$ litre of $0.1M{H}_{2}S{O}_4$ solution is :

1. $5.55mL$
2. $11.10mL$
3. $16.65mL$
4. $22.20mL$

Q.

Define the following :

Gram molecular mass

Q. The volume required to prepare $2.0\text{L}$ of $3.0\text{M}$ $H_{2}S{O}_4$ solution from $96\%\text{( w/w)}$ $H_{2}S{O}_4$ solution (density $=2g{\text{mL}}^{-1}$) is

1. $242.0mL$
2. $334.7mL$
3. $385.2mL$
4. $450.1mL$

Q. An organic compound containing $C$ and $H$ gave the following analysis: $C=40\%,H=6.7\%$ and the remaining, oxygen. Its empirical formula would be:

1. $C{H}_4$
2. $C{H}_{2}O$
3. $C_2{H}_{3}O$
4. $C_2{H}_4$

Q. Determine the percentage of water of crystallization in a sample of green vitriol.

1. $45.32\%$
2. $31.26\%$
3. $22.59\%$
4. $75.45\%$

Q.

A homogeneous ideal gaseous reaction ₎ ${\mathrm{AB}}_2\left(\mathrm{g}\right)\rightleftharpoons \mathrm{A}\left(\mathrm{g}\right)+2\mathrm{B}\left(\mathrm{g}\right)$ is carried out in a $25\mathrm{liter}$ flask at $27°\mathrm{C}$. The initial amount of ${\mathrm{AB}}_2\mathrm{was}1\mathrm{mole}$and the equilibrium pressure was $1.9\mathrm{atm}$. The value of ${\mathrm{K}}_{\mathrm{p}}\mathrm{is}\mathrm{x}\times {10}^{–2}$. The value of x here is ______. $[\mathrm{R}=0.08206{\mathrm{dm}}^3\mathrm{atm}{\mathrm{K}}^{–1}{\mathrm{mol}}^{–1}]$

Q.

Molar mass of ${\mathrm{NaNO}}_3$ is

Q.

Calculate the mass of 2.5-gram atoms of oxygen.

Q. The active mass of 64 g of HI in two litre flask will be:

1. 2
2. 1
3. 5
4. 0.25