Atoms and Molecules Test

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Atoms and Molecules Test - 67

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Weekly Quiz Competition

Question 1
1 / -0

Choose the correct answer from the options given below.
In water, the hydrogen-to-oxygen mass ratio is:

A
$$1 : 8$$

B
$$1 : 16$$

C
$$1 : 32$$

D
$$1 : 64$$

Solution

The molecular formula of water is $$H_2O$$
Mass of H $$= 1$$
Mass of O $$= 16$$
Ratio of mass $$= (2 \times H):O$$
$$=(2\times1):16$$
$$ =2:16$$
$$ =1:8$$
Question 2
1 / -0

Which of the following substance is made up of only one type of particle?

A
compound

B
element

C
mixture

D
mixed metal

Solution

$$\text{Element}$$ is the substance made up of only one type of particle.
Question 3
1 / -0

Sugar, salt, water, ammonia are:

A
elements

B
compounds

C
mixtures

D
All of the above

Solution

Sugar, salt, water and ammonia are compounds, as their molecules are made of different atoms. However, they are not mixtures, as they are not mixed with other substances.
Question 4
1 / -0

When did Maharishi Kanad give the idea of parmanu ?

A
$$ 500 BC $$

B
$$ 100 BC $$

C
$$ 460 BC $$

D
$$ 1808 BC $$

Solution

The idea of divisibility of matter was considered long back in India, around 500 BC by Maharishi Kanad.

Option A is correct.
Question 5
1 / -0

The accepted unit of atomic and molecular mass is:

A
kilogram

B
gram

C
pound

D
atomic mass unit

Solution

Accepted as unit of atomic and molecular mass is atomic mass unit (u).
Question 6
1 / -0

What is atomic mass of $$He$$ in amu $$(u)$$ units?

A
$$8$$

B
$$9$$

C
$$2$$

D
$$4$$

Solution

The atomic mass of an element is the average mass of an element measured in an atomic mass unit (amu). The atomic mass of $$He$$ is $$4\ u$$.
Option $$D$$ is correct.
Question 7
1 / -0

What is the proportion of hydrogen and oxygen by weight in water?

A
$$1:16$$

B
$$1:8$$

C
$$16:1$$

D
$$18:1$$

Solution

The weight of water is $$18$$ amu.

Weight of oxygen $$=16$$ amu

Weight of hydrogen $$=2$$ amu

Thus, the ratio of Hydrogen : Oxygen is $$2:16=1:8$$
Question 8
1 / -0

The molecular mass of a compound containing only one nitrogen atom can be

A
$$73$$

B
$$74$$

C
$$146$$

D
$$148$$

Solution

Compounds containing one $$N$$ atom always have odd molecular weights, i.e. $$73$$ here.
Question 9
1 / -0

Which one of the following is the standard for atomic mass?

A
$$ { }_{1}^{1} \mathrm{H} $$

B
$$ { }_{6}^{12} \mathrm{C} $$

C
$$ { }_{6}^{14} \mathrm{C} $$

D
$$ { }_{8}^{16} \mathrm{O} $$

Solution

$$ { }_{6}^{12} \mathrm{C} $$ is the standard for atomic mass.
Question 10
1 / -0

The time in seconds it would take to spend Avogadro's number of rupees at the rate of $$10$$ lakh rupees per second is :

A
$$6.023\times 10^{17}$$

B
$$6.023\times 10^{23}$$

C
$$6.023\times 10^{10}$$

D
$$\displaystyle 6.023\times 10^{19}$$

Solution

The time in seconds it would take to spend Avogadro's number of rupees at the rate of 10 lakh rupees per second is $$\dfrac {6.023 \times 10^{23}} {10^6} = 6.023 \times 10^{17}$$ seconds.

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Re-Attempt Weekly Quiz Competition

Atoms and Molecules Test - 67

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Atoms and Molecules Test - 67

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SHARING IS CARING

Question 1

$$1 : 8$$

$$1 : 16$$

$$1 : 32$$

$$1 : 64$$

Solution

Question 2

compound

element

mixture

mixed metal

Solution

Question 3

elements

compounds

mixtures

All of the above

Solution

Question 4

$$ 500 BC $$

$$ 100 BC $$

$$ 460 BC $$

$$ 1808 BC $$

Solution

Question 5

kilogram

gram

pound

atomic mass unit

Solution

Question 6

$$8$$

$$9$$

$$2$$

$$4$$

Solution

Question 7

$$1:16$$

$$1:8$$

$$16:1$$

$$18:1$$

Solution

Question 8

$$73$$

$$74$$

$$146$$

$$148$$

Solution

Question 9

$$ { }_{1}^{1} \mathrm{H} $$

$$ { }_{6}^{12} \mathrm{C} $$

$$ { }_{6}^{14} \mathrm{C} $$

$$ { }_{8}^{16} \mathrm{O} $$

Solution

Question 10

$$6.023\times 10^{17}$$

$$6.023\times 10^{23}$$

$$6.023\times 10^{10}$$

$$\displaystyle 6.023\times 10^{19}$$

Solution

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