Hydrogen Test

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Hydrogen Test - 15

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Weekly Quiz Competition

Question 1
1 / -0

Water consists of hydrogen and oxygen in the ratio of ______by volume.

A
1:1

B
1:2

C
2:1

D
3:1

Solution

Water consists of hydrogen and oxygen in the ratio of 2:1 by volume.
$$2H_{2}O + O_{2} \longrightarrow 2H_{2}O$$
Question 2
1 / -0

Change of $$H$$ into $${H}^{+}$$ is:

A
oxidation of hydrogen

B
acid base reaction

C
reduction of hydrogen

D
displacement reaction

Solution

Change of $$H$$ into $$H^+$$ is the oxidation of hyrogen because H has zero oxidation number and $$H^+$$ has +1 oxidation number,loss of electrons is oxidation.
So answer is A.
Question 3
1 / -0

On Fahrenheit scale, the boiling point of water is:

A
$$100^{\circ}F$$

B
$$80^{\circ}F$$

C
$$212^{\circ}F$$

D
$$32^{\circ}F$$

Solution

On the Fahrenheit scale, the freezing point of water is $$32^{\circ}F$$ and the boiling point is $$212^{\circ}F$$ (at standard atmospheric pressure).
Fahrenheit to Celsius : $$ (F - 32) * 1.8 =C $$
Boiling point of water is 100 degree C. Then, $$F = (100 * 1.8) + 32$$ = $$212^{\circ}F$$
Option C is correct.
Question 4
1 / -0

The $$pH$$ of water is:

A
9

B
3

C
7

D
4

Solution

Although the pH of pure water is 7, drinking water and neutral water exhibits a large pH range because it contains dissolved minerals and gases. Surface waters typically range from pH 6.5 to 8.5 while groundwater ranges from pH 6 to 8.5. Water with a pH less than 6.5 is considered acidic.
Question 5
1 / -0

Pure water is a ______ conductor of electricity.

A
good

B
bad

C
semi

D
none of these

Solution

Pure water is free of impurities (salts and minerals). Impurities are necessary for electrical conductivity so pure water is a bad conductor of electricity.
Question 6
1 / -0

The density of pure water is:

A
0.1 g/cm$$^{3}$$

B
1 g/cm$$^{3}$$

C
100 g/cm$$^{3}$$

D
1 kg/cm$$^{3}$$

Solution

Density is the ratio of mass per unit volume.
The density of pure water is $$1 g / cm^{3}$$ or $$1000 kg / m^{3}$$.
Question 7
1 / -0

What is the molecular weight of water?

A
21

B
18

C
20

D
16

Solution

The atomic masses of O and H are 16 g/mol and 1 g/mol respectively.
The molecular formula of water is $$H_2O$$ and its molecular weight $$2(1) + 16=18$$ g/mol.
Note:
Water is one of the most precious resources on earth and is necessary for all living beings. We use water for different purposes like drinking, cooking, bathing, washing and many more activities. Pure water is colorless, odorless and tasteless.
Question 8
1 / -0

Aquatic animals use ______ dissolved in water to respire.

A
$$\displaystyle { CO }_{ 2 }$$

B
$$\displaystyle { H }_{ 2 }$$

C
$$\displaystyle { O }_{ 2 }$$

D
$$\displaystyle { H }_{ 2 }{ O }_{ 2 }$$

Solution

Aquatic animals use oxygen gas dissolved in water to respire.
The oxygen dissolve in marine water by diffusion from the surrounding air. This dissolved oxygen is then used by marine animals for respiration.
Question 9
1 / -0

The chemical formula of ice is:

A
O$$_2$$

B
H$$_2$$O

C
N$$_2$$

D
H$$_2$$

Solution

The chemical formula of ice is $$H_2O$$, as ice constitutes only water molecules which are solidified. Hence even ice chemical formula is same as water.
Question 10
1 / -0

The density of water is:

A
$$1\ g/cm$$$$^3$$

B
$$20\ g/cm$$$$^3$$

C
$$2\ g/cm$$$$^3$$

D
$$0.1\ g/cm$$$$^3$$

Solution

The density of water is $$1 g/cm^{3}$$. Density is a ratio of Mass to the Volume. 1 meter long, 1 meter wide, 1 meter high storage tank can store 1,000 kg mass of water. So the density of water is 1. Therefore 1 kg water= 1 litre water(approximately).

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Re-Attempt Weekly Quiz Competition

Hydrogen Test - 15

Result

Hydrogen Test - 15

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Rank

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SHARING IS CARING

Question 1

1:1

1:2

2:1

3:1

Solution

Question 2

oxidation of hydrogen

acid base reaction

reduction of hydrogen

displacement reaction

Solution

Question 3

$$100^{\circ}F$$

$$80^{\circ}F$$

$$212^{\circ}F$$

$$32^{\circ}F$$

Solution

Question 4

9

3

7

4

Solution

Question 5

good

bad

semi

none of these

Solution

Question 6

0.1 g/cm$$^{3}$$

1 g/cm$$^{3}$$

100 g/cm$$^{3}$$

1 kg/cm$$^{3}$$

Solution

Question 7

21

18

20

16

Solution

Question 8

$$\displaystyle { CO }_{ 2 }$$

$$\displaystyle { H }_{ 2 }$$

$$\displaystyle { O }_{ 2 }$$

$$\displaystyle { H }_{ 2 }{ O }_{ 2 }$$

Solution

Question 9

O$$_2$$

H$$_2$$O

N$$_2$$

H$$_2$$

Solution

Question 10

$$1\ g/cm$$$$^3$$

$$20\ g/cm$$$$^3$$

$$2\ g/cm$$$$^3$$

$$0.1\ g/cm$$$$^3$$

Solution

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