Some Basic Concepts of Chemistry Test

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Some Basic Concepts of Chemistry Test - 37

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Question 1
1 / -0

All gases have the same number of moles in the same volume at constant T and P is stated by :

A
Boyle's law

B
Charle's law

C
Avogardro's law

D
ideal gas law

E
Dalton's law

Solution

Avogadro's law states that, "equal volumes of all gases, at the same temperature and pressure, have the same number of molecules". For a given mass of an ideal gas, the volume and amount (moles) of the gas are directly proportional if the temperature and pressure are constant.
Question 2
1 / -0

From $$2$$ moles of $$KClO_3$$ by decomposition of all the $$KClO_3$$, how many liters of $$O_2$$ can be produced at STP?

A
$$11.2$$

B
$$22.4$$

C
$$33.6$$

D
$$44.8$$

E
$$67.2$$

Solution

$$\displaystyle 2KClO_3 \rightarrow 2KCl +3O_2 $$

The decomposition of 2 moles of $$\displaystyle KClO_3$$ produces 3 moles of $$\displaystyle O_2$$.

At STP, 1 mole of $$\displaystyle O_2$$ will occupy a volume of 22.4 L.

At STP, 3 moles of $$\displaystyle O_2$$ will occupy a volume of $$\displaystyle 3 \times 22.4 = 67.2$$ L.

Hence, the correct answer is option $$\text{E}$$.
Question 3
1 / -0

How many grams of $$H_2SO_4$$ are there in $$1,000$$ grams of a $$10\%$$ solution? Given $$(1$$ mol of $$H_2SO_4=98$$g$$)$$

A
$$1.0$$

B
$$9.8$$

C
$$10$$.

D
$$98$$

E
$$100$$.

Solution

1,000 grams of a 10% solution contains $$\displaystyle 1000 \times \dfrac {10}{100} = 100$$ grams of sulphuric acid.
Question 4
1 / -0

How many grams of NaOH are required to make $$100$$ grams of a $$5\%$$ solution?

A
$$2$$

B
$$5$$

C
$$20$$

D
$$40$$

E
$$95$$

Solution

100 grams of a 5% solution contains $$\displaystyle \dfrac {100 \times 5}{100 } = 5 g $$.
Hence, 5 grams of NaOH are required to make 100 grams of a 5% solution.
Question 5
1 / -0

Which scientist synthesised 1st organic compound in lab?

A
Friedrich Wohler

B
Antoine Lavoisier

C
Robert Boyle

D
Willard Gibbs

Solution

Friedrich Wohler synthesized urea $$NH_2CONH_2$$ which was the first organic compound synthesized in lab.
Question 6
1 / -0

Mass of $$12.044 \times 10^{23}$$ atoms of hydrogen is:

A
$$1 g$$

B
$$2 g$$

C
$$3 g$$

D
$$4 g$$

Solution

$$\dfrac{mass}{molecular\, weight}=\dfrac{No.\, of\, atoms}{N_{A}}$$
$$mass=\dfrac{12.044\times 10^{23}}{6.022\times 10^{23}}\times 1$$ {Hydrogen molecular weight =$$ 1 g/mol$$}
$$Mass = 2g$$
Question 7
1 / -0

Which law states that in a chemical reaction, the total mass of the products is equal to the total mass of the reactants?

A
Law of constant proportions

B
Law of conservation of energy

C
Law of conservation of mass

D
Law of multiple proportions

Solution

The law which states that in a chemical reaction, the total mass of the products is equal to the total mass of the reactants is known as the "Law of conservation of mass".
Question 8
1 / -0

How many grams of $$NaOH$$ are needed to make 100 g of a 5 % solution?

A
$$2$$

B
$$5$$

C
$$20$$

D
$$40$$

E
$$96$$

Solution

Let $$W$$ grams of $$NaOH$$ are needed to make 100 g of a 5 % solution.

$$\displaystyle \text { Percentage by mass } = \dfrac { \text { Mass of NaOH } }{ \text { Mass of solution } } \times 100$$

$$\displaystyle \text { 5 } = \dfrac { \text { W g } }{ \text { 100 g } } \times 100$$

$$\displaystyle \text { W } = \text {5 g } $$
Question 9
1 / -0

This is the branch of chemistry dealing with the separation, identification and quantitative determination of the composition of different substances. Name is :

A
Physical chemistry

B
Inorganic chemistry

C
Organic chemistry

D
Analytical chemistry

Solution

Analytical chemistry deals with the separation, identification and quantitative determination of the composition of different substances.

Hence the correct option is D.
Question 10
1 / -0

Which branch of chemistry deals with substances consisting of living organism ?

A
Physical chemistry

B
Biochemistry

C
Organic chemistry

D
Analytical chemistry

Solution

Biochemistry deals with the Chemical changes undergoing inside living organisms. It is the application of chemistry to the study of biological processes at the cellular and molecular level.

It emerged as a distinct discipline around the beginning of the 20th century when scientists combined chemistry, physiology, and biology to investigate the chemistry of living systems.

Hence, option $$B$$ is correct.

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Re-Attempt Weekly Quiz Competition

Some Basic Concepts of Chemistry Test - 37

Result

Some Basic Concepts of Chemistry Test - 37

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SHARING IS CARING

Question 1

Boyle's law

Charle's law

Avogardro's law

ideal gas law

Dalton's law

Solution

Question 2

$$11.2$$

$$22.4$$

$$33.6$$

$$44.8$$

$$67.2$$

Solution

Question 3

$$1.0$$

$$9.8$$

$$10$$.

$$98$$

$$100$$.

Solution

Question 4

$$2$$

$$5$$

$$20$$

$$40$$

$$95$$

Solution

Question 5

Friedrich Wohler

Antoine Lavoisier

Robert Boyle

Willard Gibbs

Solution

Question 6

$$1 g$$

$$2 g$$

$$3 g$$

$$4 g$$

Solution

Question 7

Law of constant proportions

Law of conservation of energy

Law of conservation of mass

Law of multiple proportions

Solution

Question 8

$$2$$

$$5$$

$$20$$

$$40$$

$$96$$

Solution

Question 9

Physical chemistry

Inorganic chemistry

Organic chemistry

Analytical chemistry

Solution

Question 10

Physical chemistry

Biochemistry

Organic chemistry

Analytical chemistry

Solution

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