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Soluble or insoluble? - class-X

Description: soluble or insoluble?
Number of Questions: 27
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Tags: grouping of materials water materials and things nature of things solids, liquids and gases matter : nature and behaviour stoichiometric relationships evs substances in the surroundings - their states and properties chemistry the nature of matter separation of substances life giving water solutions is matter pure is matter around us pure experiments with water solution sorting materials into groups
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What are transparent materials?

evs nature of things objects that float or sink substances that sink or float soluble and insoluble substances

  1. The material which does not allow light to pass through it.

  2. The material which allows light to pass through it.

  3. The material through which light can pass partially.

  4. None of these.

Show answer
Correct Option: B
Explanation:

Materials which allow light to completely pass through them without getting scattered are called Transparent material.

Example- a glass of water, clear eyeglasses.

What do you call a substance through which things are partially visible?

evs nature of things objects that float or sink substances that sink or float soluble and insoluble substances

  1. Opaque object

  2. Transparent object

  3. Lustrous object

  4. Translucent object

Show answer
Correct Option: D
Explanation:

The material which does not allow light to pass through it is called opaque and material which allows light to pass through it is called transparent. The material through which light can pass partially is called translucent, e.g. butter paper.

Which of the following substance is not transparent?

evs nature of things objects that float or sink substances that sink or float soluble and insoluble substances

  1. Glass

  2. Pure Water

  3. Air

  4. Steel

Show answer
Correct Option: D
Explanation:

Transparent material:- Materials which allow light to completely pass through them without getting scattered are called Transparent material.

Example- a glass of water, clear metal-containing.
Steel does not allow to pass light through it hence is an opaque object.

Translucent substances  __________.

evs nature of things objects that float or sink substances that sink or float soluble and insoluble substances

  1. allow the light to pass through it completely

  2. allow the light to pass through it partially

  3. does not allow the light to pass through it

  4. none of these

Show answer
Correct Option: B
Explanation:

Those materials that allow some light to pass through them are called translucent and include things like frosted glass and wax paper.

Name two transparent materials. 

evs nature of things objects that float or sink substances that sink or float soluble and insoluble substances

  1. Glass and wood

  2. Plastic and cold wax

  3. Plastic and glass

  4. Water and honey

Show answer
Correct Option: C
Explanation:

Materials which allow light to completely pass through them without getting scattered are called Transparent material.

Example- Plastic, Glass.

How many of the following are soluble in water?
salt, sugar, sand, dust

evs nature of things objects that float or sink substances that sink or float soluble and insoluble substances

  1. 1

  2. 2

  3. 3

  4. 4

Show answer
Correct Option: B

Which of the following type of bodies form sharp shadows when placed in the path of light?

evs nature of things objects that float or sink substances that sink or float soluble and insoluble substances

  1. Transparent

  2. Translucent

  3. Transparent and translucent

  4. Opaque

Show answer
Correct Option: D
Explanation:

Transport bodies allow light to pass through it while translucent bodies allow light partially through it but opaque bodies do not allow light to pass through it, so they form sharp shadows when placed in the path of light.

Option (D) is correct.

Which of the following type of bodies form sharp shadows when placed in the path of light?

evs nature of things objects that float or sink substances that sink or float soluble and insoluble substances

  1. Transparent

  2. Translucent

  3. Both A and B

  4. Opaque

Show answer
Correct Option: D
Explanation:
An opaque object is neither transparent (allowing all light to pass through) nor translucent (allowing some light to pass through). 

When light strikes an interface between two substances, in general, some may be reflected, some absorbed, some scattered, and the rest transmitted. 

Opaque object forms sharp shadow when placed in the path of the light.

Hence, option D is correct.

Select the objects which are opaque: 

evs nature of things objects that float or sink substances that sink or float soluble and insoluble substances

  1. water, oil and soil

  2. soil, sand and dust

  3. glass, grass and gum

  4. marvel, oiled paper and magnet

Show answer
Correct Option: B
Explanation:

Opaque objects are materials which do not allow light to pass through them.

Examples are- Soil, sand and dust.

Pick one material which is completely soluble in water:

chemistry nature of things objects that float or sink substances that sink or float soluble and insoluble substances

  1. oil

  2. sawdust

  3. mud

  4. alum

Show answer
Correct Option: D
Explanation:

Alum is a hydrated double salt sometimes used as water purifier is completely soluble in water.

Select a pair of solute and solvent materials to form solution:

chemistry nature of things objects that float or sink substances that sink or float soluble and insoluble substances

  1. Chalk powder and water

  2. Alcohol and water

  3. Milk and oil

  4. Glass and water

Show answer
Correct Option: B
Explanation:

In general, organic compounds are insoluble in water. Though alcohol is an organic compound it is soluble in water due to hydrogen bonding. 

Find odd one out on the basis of the solubility of the material.

chemistry nature of things objects that float or sink substances that sink or float soluble and insoluble substances

  1. Sugar

  2. Salt

  3. Chalk

  4. Wood

Show answer
Correct Option: D
Explanation:

Wood is not at all soluble in water whereas sugar and salt are soluble and chalk $(CaCO _3)$ is slightly soluble in water.

Which of the following floats on water?

chemistry nature of things objects that float or sink substances that sink or float soluble and insoluble substances

  1. Air filled tube of a tyre

  2. A sharpener

  3. A stone

  4. A chain

Show answer
Correct Option: A
Explanation:

Air filled tube floats on water as it contain air and which is very less dense than water.

The EMF of the cell: Ag, AgCl in $0.1 M - KCl \parallel$ satd. $ NH _{4}NO _{3}\parallel 0.1 M - Ag NO _{3},$ Ag is 0.42 V at $ 25^{\circ}C.$ 0.1 M-KCl is 50% dissociated and $0.1 M - Ag NO _{3}$ is 40% dissociated. The solubility product of $ AgCl $ is $ (2.303 RT/F = 0.0)$

chemistry nature of things objects that float or sink substances that sink or float soluble and insoluble substances

  1. $1.0 \times 10^{-10} $

  2. $ 2.0 \times 10^{-9} $

  3. $ 1.0 \times 10^{-9}$

  4. $ 2.0 \times 10^{-10} $

Show answer
Correct Option: D

Maximum of 9.72 g of potassium chloride dissolves in 30 g of water at $70^{\circ}$C. The solubility of potassium chloride at $70^{\circ} C$ is:

chemistry nature of things objects that float or sink substances that sink or float soluble and insoluble substances

  1. 3.24 g

  2. 32.4 g

  3. 0.324 g

  4. 33.4 g

Show answer
Correct Option: B
Explanation:

Solubility is defined as solubility of different substances in grams per 100 gm of water.
30 gm of water dissolves 9.72 g of $KCl$.
So, 100gm will dissolve in $9.72\times 100/30=32.4$ gm.

What do you understand by the statement "the solubility of copper sulphate in water at $20^{\circ}C$ is 20.7 g" ?

chemistry nature of things objects that float or sink substances that sink or float soluble and insoluble substances

  1. A maximum of 20.7 grams of copper sulphate can be dissolved in 100 ml water at a temperature $20^{\circ}$C.

  2. A maximum of 20.7 grams of copper sulphate can be dissolved in 100 g of water at $20^{\circ}$C.

  3. A maximum of 20.7 grams of copper sulphate can be dissolved in 79.3 g of water at $20^{\circ}$C.

  4. A maximum of 20.7 grams of copper sulphate can be dissolved in 79.3 ml of water at $20^{\circ}$C.

Show answer
Correct Option: B
Explanation:

Solubility is given in grams per 100 gm of water with temperature and 1 atmospheric pressure.

In the solvation of $NaCl$ in water, which of the following occur ?

chemistry nature of things objects that float or sink substances that sink or float soluble and insoluble substances

  1. Hydrogen atom interacts with $Cl^-$ atom

  2. Oxygen atom interacts with $Na^+$ atom

  3. Both $A$ and $B$

  4. None of these

Show answer
Correct Option: C
Explanation:

In the water molecule oxygen has higher electronegativity than hydrogen thus has a partial negative charge and hydrogen has a partial positive charge. So during the solvation of NaCl in water, hydrogen atoms interact with chlorine anion and oxygen interact with sodium cation.

______ is the chief component of natural gas.

chemistry nature of things objects that float or sink substances that sink or float soluble and insoluble substances

  1. Ethane

  2. Methane

  3. Propane

  4. Butane

Show answer
Correct Option: B
Explanation:

Natural gas is a fossil fuel. It is used for cooking, heating and electricity generation. It is found deep underground rock formation. It is a naturally occurring hydrocarbon gas mixture consisting primarily of methane. It is also used as fuel for vehicles.

DHOKALA is a __________ type of solution.

chemistry nature of things objects that float or sink substances that sink or float soluble and insoluble substances

  1. solid-in-solid

  2. solid-in-gas

  3. solid-in-liquid

  4. gas-in-solid

Show answer
Correct Option: D
Explanation:

DHOKALA is a Gas-in-solid type of solution.
The dispersed phase is gas (air) and the dispersion medium is solid (material from which dhokala is made).

Select the material which is insoluble in water.

chemistry nature of things objects that float or sink substances that sink or float soluble and insoluble substances

  1. Glucose

  2. Washing soda

  3. Alcohol

  4. Benzene

Show answer
Correct Option: D
Explanation:

As like dissolves like, in general, organic compounds are insoluble in water. Benzene $(C _6H _6)$ is an organic compound soluble in an organic solvent like carbon disulphide, and is insoluble in water.

At ${25}^{o}C$ the solubility of ${Ag} _{2}{CO} _{3}$ (${K} _{sp}=4.3\times {10}^{-13}$) would be in what order in the following solutions?

chemistry nature of things objects that float or sink substances that sink or float soluble and insoluble substances

  1. $0.01M$ $Ag{NO} _{3}$

  2. $0.04M$ ${K} _{2}{CO} _{3}$

  3. pure water

  4. in a buffer ($pH=4$)

Show answer
Correct Option: A

$Ca _3(PO _4) _2$ is insoluble in water. On adding a few drops of HCl to solid $Ca _3(PO _4) _2$ in contact with water, the solid dissolves. The reason is?

chemistry nature of things objects that float or sink substances that sink or float soluble and insoluble substances

  1. The solvent becomes more polar on adding HCl

  2. $Ca _3(PO _4) _2$ combines with HCl to form soluble $CaCl _2$

  3. $Ca(H _2PO _4) _2$ is formed, which dissolves

  4. $H _3PO _4$, a weak acid is formed and the solubility product of $Ca _3(PO _4) _2$ decrease

Show answer
Correct Option: A

The solubility of $A {2}X _{3}$ is $y$ $mol$ $dm^ {-3}$. Its solubility product is ____________.

chemistry nature of things objects that float or sink substances that sink or float soluble and insoluble substances

  1. $6y^ {4}$

  2. $64y^ {4}$

  3. $36y^ {5}$

  4. $108y^ {5}$

Show answer
Correct Option: A

What is the solubility of $Al(OH _{3}), K _{sp} = 1 \times 10^{-33}$, in a solution having $pH = 4$?

chemistry nature of things objects that float or sink substances that sink or float soluble and insoluble substances

  1. $6 \times 10^{-3}$M

  2. $10^{-6}$M

  3. $1.5 \times 10^{-4}$M

  4. $2.47 \times 10^{-9}$M

Show answer
Correct Option: D
Explanation:

The solubility equilibrium of $Al(OH) _3$ is

$Al(OH) _3$ ${\rightarrow} _{\leftarrow}$ $Al^{+3}$  + $3OH^-$
Therefore $x=1,\ y=2$ and $K _{sp}$=$[Al^{+3}]\times [OH^-]$ = $27S^4$
$S$ = $(\dfrac{10^{-33}}{27})^{1/4}$
Therefore $S$= $2.47\times 10^{-9}M$ in $ mol\ dm^{-3}$

Which of the following is most soluble?

chemistry nature of things objects that float or sink substances that sink or float soluble and insoluble substances

  1. ${Bi} _{2}{S} _{3} \left({K} _{sp} = 1\times {10}^{-17}\right)$

  2. $MnS\left({K} _{sp} = 7\times {10}^{-16}\right)$

  3. $CuS\left({K} _{sp} = 8\times {10}^{-37}\right)$

  4. ${Ag} _{2}S\left({K} _{sp} = 6\times {10}^{-51}\right)$

Show answer
Correct Option: A
Explanation:

Ksp (Solubility product constant) is the equilibrium between a solid and its respective ions in a solution. The value of the constant identifies the degree to which the compound can dissociate in water. The higher the Ksp the more soluble the compound is.
Bismuth is a large ion and sulphur is a small ion, the attractive forces between them are high thus the solubility is high. The solubility product can be calculated as :
$Bi _2S _3$
$K _sp = 1 \times 10^{-17}$
$K _sp = [Bi]^2 [S]^3$
$1 \times 10^{-17} = (2x)^2 (3x)^3 = 108x^5$
$x^5 = \dfrac{1 \times 10^{17}}{108} = 0.000156M $

The solubility of $Ag _{2}CO _{3}$ in water is $1.26 \times 10^{-4}$ mole/litre. What is solubility in 0.02 M $Na _{2}CO _{3}$ solution?
Note : Assume no hydrolysis of $CO _{3}^{2-}$ ion. (Take $\sqrt[3]{2} = 1.26$).

chemistry nature of things objects that float or sink substances that sink or float soluble and insoluble substances

  1. $5 \times 10^{-6}$M

  2. $\sqrt{50} \times 10^{-6}$M

  3. $10^{-5}$M

  4. $2 \times 10^{-5}$M

Show answer
Correct Option: C

$PbCl _2$ has maximum concentration of $1.0 \times 10^{-3}$ M in its saturated aq. solution at $25^0$C. Its solubility in $0.1$M NaCl solution will be : 

chemistry nature of things objects that float or sink substances that sink or float soluble and insoluble substances

  1. $4 \times 10^{-7}$M

  2. $4 \times 10^{-9}$M

  3. $2 \times 10^{-7}$M

  4. $2 \times 10^{-9}$M

Show answer
Correct Option: A
Explanation:

In saturated aqueous solution :
Maximum concentration in saturated aqueous solution is the solubility (S) of $\displaystyle PbCl _2$

$\displaystyle S=1.0 \times 10^{-3} \ M$

$\displaystyle [PbCl _2]=[Pb^{2+}]=S=1.0 \times 10^{-3} \ M$

$\displaystyle [Cl^-]=2 \times [PbCl _2]= 2 \times  S= 2 \times  1.0 \times 10^{-3} \ M=2.0 \times 10^{-3} \ M$

$\displaystyle K _{sp}=[Pb^{2+}] \times [Cl^-]^2$

$\displaystyle K _{sp}=1 .0 \times 10^{-3} \times [2.0 \times 10^{-3}]^2$

$\displaystyle K _{sp}=4.0 \times 10^{-9}$

In 0.1 M NaCl solution:

$\displaystyle [Cl^-]=[NaCl]=0.1 \ M$

Assuming $Cl^-$ ion from $PbCl _2$ is negligible

$\displaystyle K _{sp}=[Pb^{2+}] \times [Cl^-]^2$

$\displaystyle 4.0 \times 10^{-9}=[Pb^{2+}] \times [0.1]^2$

$\displaystyle [Pb^{2+}]=4.0 \times 10^{-7}  \ M$

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