Hydrogen Test

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Hydrogen Test - 32

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Weekly Quiz Competition

Question 1
1 / -0

Which property of water make it easy to contaminate and difficult to purify?

A
Water is a universal solvent

B
Tendency to dissolve a large number of substances

C
Both A and B

D
None of the above

Solution

The property of water make it easy to contaminate and difficult to purify is its tendency to dissolve a large number of substances. The ocean/sea water is not fit for drinking and washing because it contains high concentration of the dissolved salts.
Question 2
1 / -0

Which property of water is used by plants for taking minerals from the soil?
I) Water can form aqueous solutions.
II) Water can dissolve a wide variety of substances.

A
I

B
II

C
I, II

D
none of the above

Solution

Plants absorb water from the soil by osmosis.water can form aqueous solution so osmosis becomes possible. They absorb mineral ions by active transport, against the concentration gradient. Root hair cells are adapted for taking up water and mineral ions by having a large surface area to increase the rate of absorption.
Question 3
1 / -0

Which of the following is a universal solvent?

A
water

B
alcohol

C
acetic acid

D
both A and B

Solution

Water is a universal solvent. Water is capable of dissolving a variety of different substances. It dissolves more substances than any other liquid. Water is important to every living thing on earth. Wherever water goes, either through the ground or through our bodies, it takes along valuable chemicals, minerals, and nutrients.
Question 4
1 / -0

Aquatic plants use $$\displaystyle { CO }_{ 2 }$$ dissolved in water for :

A
breakdown of toxic materials

B
respiration

C
excretion

D
photosynthesis

Solution

The aquatic plants utilize the dissolved carbon dioxide to prepare their own food in the form of carbohydrates by photosynthesis. This process also releases oxygen which is then use by aquatic animals and plants for respiration.

$$\displaystyle { CO }_{ 2 }+{ H }_{ 2 }O\longrightarrow { O }_{ 2 }+{ C }_{ 6 }{ H }_{ 12 }{ O }_{ 6 }$$

Fish and aquatic animals cannot split oxygen from water ($$H_2O$$) or other oxygen-containing compounds. Only green plants and some bacteria can do that through photosynthesis and similar processes.

Hence, the correct option is $$D$$
Question 5
1 / -0

____ dissolve in water reacts with $$\displaystyle { CaCO }_{ 3 }$$ from rocks to form _______ .

A
$$\displaystyle { CO }_{ 2 }$$, calcium bicarbonate

B
$$\displaystyle { O }_{ 2 }$$, calcium bicarbonate

C
$$\displaystyle { CO }_{ 2 }$$, calcium carbonate

D
$$\displaystyle { O }_{ 2 }$$, calcium carbonate

Solution

Calcium is important for formation and strengthening of shells of snails and crabs. $$CO_2$$ dissolved in water reacts with $$CaCO_3$$ (limestone ) from rocks to form calcium bicarbonate. This is absorbed by the marine animals.

$$CaCO_3 + CO_2 + H_2O \rightarrow Ca(HCO_3)_2$$
Question 6
1 / -0

Is $$\displaystyle { CO }_{ 2 }$$ is more solution in water than $$\displaystyle { O }_{ 2 }$$?

A
Yes

B
No

C
Ambiguous

D
Data insufficient

Solution

$$CO_2$$ when dissolves in water it interacts with surrounding water molecules to hydrate itself, i.e the electronegative oxygen atoms of $$CO_2$$ forms strong H-bond with H atoms of water molecules, This interaction is very strong to dissolve more and more $$CO_2$$ molecules. Thus, Carbon dioxide ($$CO_2$$) is more soluble in water than ($$ O_2$$).
Question 7
1 / -0

Ratio of hydrogen to oxygen in water is:

A
$$2:1$$

B
$$1:2$$

C
$$7:1$$

D
$$8:1$$

Solution

The ratio of hydrogen to oxygen in water is 2:1.
Two molecules of the diatomic hydrogen gas, combine with one molecule of the diatomic oxygen gas to produce two molecules of water. In other words the ratio of hydrogen to oxygen is 2:1, the ratio of hydrogen to water is 1:1, and the ratio of oxygen to water is 1:2.
$$2H_2 + O_2 \rightarrow 2H_2O$$
Question 8
1 / -0

Water plays an important role in :

A
hydrological cycle

B
water cycle

C
both A and B

D
none of above

Solution

Water plays an important role in hydrological cycle(water cycle).
The water cycle, also known as the hydrological cycle or the $$H_2O$$ cycle, describes the continuous movement of water on, above and below the surface of the Earth. The water cycle involves the exchange of energy, which leads to temperature changes. For instance, when water evaporates, it takes up energy from its surroundings and cools the environment. When it condenses, it releases energy and warms the environment. These heat exchanges influence climate.
Question 9
1 / -0

Water exists in which of the following state?

A
solid

B
liquid

C
gas

D
all of above

Solution

Water exists in solid state (ice), liquid state (water) and gaseous state (steam or water vapours).
Water is the only substance that exists on earth in all the three physical states: solid, liquid and gas. Earth has rivers, lakes and oceans in liquid form.
Polar regions are covered with solid water called ice. Water absorb solar energy and evaporate and escape as water vapour.
Question 10
1 / -0

Water is ______ in nature.

A
acidic

B
basic

C
neutral

D
none of above

Solution

Water is neutral in nature.
Since pH is defined as the negative log of the hydrogen ion concentration, the pH of pure water is 7 or neutral. Pure water is neutral because the number of positive hydrogen ions produced is equal to the number of negative hydroxide ions.

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Hydrogen Test - 32

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Hydrogen Test - 32

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SHARING IS CARING

Question 1

Water is a universal solvent

Tendency to dissolve a large number of substances

Both A and B

None of the above

Solution

Question 2

I

II

I, II

none of the above

Solution

Question 3

water

alcohol

acetic acid

both A and B

Solution

Question 4

breakdown of toxic materials

respiration

excretion

photosynthesis

Solution

Question 5

$$\displaystyle { CO }_{ 2 }$$, calcium bicarbonate

$$\displaystyle { O }_{ 2 }$$, calcium bicarbonate

$$\displaystyle { CO }_{ 2 }$$, calcium carbonate

$$\displaystyle { O }_{ 2 }$$, calcium carbonate

Solution

Question 6

Yes

No

Ambiguous

Data insufficient

Solution

Question 7

$$2:1$$

$$1:2$$

$$7:1$$

$$8:1$$

Solution

Question 8

hydrological cycle

water cycle

both A and B

none of above

Solution

Question 9

solid

liquid

gas

all of above

Solution

Question 10

acidic

basic

neutral

none of above

Solution

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