Tag: nature of things

Questions Related to nature of things

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

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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} $

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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.

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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

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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

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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

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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 ($pH=4$)

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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

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Correct Option: A