Quantitative Aptitude

Mixtures and Alligation

1,816 Questions

All Direct removal and addition 448 Alligation cross rule 270 Ratios, quantities, and percentages 233 Weighted mean and concentration 195 Equal quantity replacement 189 Three or more components 174 Repeated equal-volume replacement 154 Profit-based alligation 153

Mixtures and Alligation Questions

Multiple choice

When $100$g of a liquid A at $100^o$C is added to $50$g of a liquid B at temperature $75^o$C, the temperature of the mixture becomes $90^o$C. The temperature of the mixture, if $100$g of liquid A at $100^o$C is added to $50$g of liquid B at $50^o$C, will be?

$80^o$C
$60^o$C
$70^o$C
$85^o$C

Reveal answer Fill a bubble to check yourself

Multiple choice

The ratio of masses of oxygen and nitrogen in a particular gaseous mixture is $ 1:4$. The ratio of number of their molecules is :

$ 1:8$
$ 3:16$
$ 1:4$
$ 7:32$

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Multiple choice

A flask contains argon and chlorine in the ratio of $2:1$ by mass. The temperature of the mixture is $27^0C$ . The ratio of average kinetic energies of two gases per molecule is

$1:1$
$2:1$
$3:1$
$6:1$

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Multiple choice

The volume of ethyl alcohol (density $1.15\ {g}/{cc}$) that has to be added to prepare $100\ cc$ of $0.5\ M$ ethyl alcohol solution in water is :

$1.15\ cc$
$2\ cc$
$2.15\ cc$
$2.30\ cc$

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Multiple choice

Equal weights of $CH_{4}$ and $H_{2}$ are mixed in an empty container at $25^{\circ}C$. The fraction of the total pressure exerted by $H_{2}$ is:

$1/9$
$1/2$
$8/9$
$16/17$

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Multiple choice

Air inside a closed container is saturated with water vapour. The air pressure is $p$ and the saturated vapour pressure of water is $\overline { p } $. If the mixture is compressed to one-half of its volume by maintaining temperature constant, the pressure becomes :

$2(p+\overline { p } )$
$2p+\overline { p } $
$\dfrac{(p+\overline { p } )}{2}$
$p+2\overline { p } $

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Multiple choice

Equal masses of three liquids $A, B$ and $C $have temperatures $\displaystyle { 10 }^{ \circ }C,{ 25 }^{ \circ }C$ and $\displaystyle { 40 }^{ \circ }C$ respectively. If A and B are mixed, the mixture has a temperature of $\displaystyle { 15 }^{ \circ }C$. If $B$ and $C$ are mixed, the mixture has a temperature of $\displaystyle { 30 }^{ \circ }C$. If $A$ and $C$ are mixed the temperature of the mixture is:

$\displaystyle { 29 }^{ \circ }C$
$\displaystyle { 25 }^{ \circ }C$
$\displaystyle { 20 }^{ \circ }C$
$\displaystyle { 16 }^{ \circ }C$

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Multiple choice

A Barrel is completely filled with acetone. 20% of the acetone is replaced by water. This is done 2 more times. What is the final % of acetone remaining in the barrel ?

<font face="MathJax_Main">51.2%</font>
50%
66%
70%

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Multiple choice

Initially a beaker has $100$g of water at temperature $90^oC$. Later another $600g$ of water at temperature $20^oC$ was poured into the beaker. The temperature, T of the water after mixing is?

$20^oC$
$30^oC$
$45^oC$
$55^oC$
$90^oC$

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Multiple choice

A sample of sea water contains $5\times 10^{-3}g$ of dissolved oxygen in $1\ kg$ of the sample. The concentration of $O_{2}$ in that sea water sample in ppm is:

$5\times 10^{4}$
$5\times 10^{-3}$
$5\times 10^{-2}$
$5\times 10^{-1}$
$5$

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Multiple choice

Equal masses of two substances of densities $\rho_A$ and $\rho_B$ are mixed together. The density of the mixture would be

$\sqrt{\rho_A \rho_B}$
$\frac{\rho_A + \rho_B}{2}$
$\frac{\rho_A \rho_B}{\rho_A + \rho_B}$
$\frac{2\rho_A \rho_B}{\rho_A + \rho_B}$

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Multiple choice

Equal masses of methane and hydrogen are mixed in an empty container at ${25}^{o}C$. The fraction of the total pressure exerted by hydrogen is:

$\cfrac{1}{2}$
$\cfrac{8}{9}$
$\cfrac{1}{9}$
$\cfrac{16}{17}$

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Multiple choice

A mixture of $CH_4, N_2$ and $O_2$ is enclosed in a vessel of one litre capacity at $0^oC$. The ratio of pressure of gases is $1:4:2$. Total pressure of the gaseous mixture is $2660 \,mm$. The molecules of oxygen present in the vessel is

$\dfrac{{0.02 \times {{10}^{23}}}}{{22.4}}$
$4.02 \times 10^{23}$
$22.4 \times 10^{22}$
$1000$

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Multiple choice

If a mixture of $28$g of nitrogen, $4$g of hydrogen and $8$g of helium is contained in a vessel at temperature $400$K and pressure $8.3\times10^5$Pa, the density of the mixture will be:-

$3kg/m^3$
$1.25kg/m^3$
$2g/litre$
$1.5g/litre$

Reveal answer Fill a bubble to check yourself

Multiple choice

When equal volume of two substances are mixed, the specific gravity of mixture is $4$. When equal weights of the same substances are mixed, the specific gravity of the mixture is $3$. The ratio of the specific gravity of two substances would be

$2.0$
$3.0$
$3.5$
$4.5$

Reveal answer Fill a bubble to check yourself

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