Hydrogen Test

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Hydrogen Test - 40

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following cause alkalinity as well as hardness in natural water?

A
$$CaCO_3$$

B
$$Ca(HCO_3)_2$$

C
$$MgCO_3$$

D
All of the above

Solution

Calcium carbonate, bicarbonate, Magnesium carbonate, all the above salts cause the hardness of water because they dissolve in the form of ions in water and do not allow to form lather with soap.
Question 2
1 / -0

The source of Arsenic in water is:

A
industrial waste

B
fertilizers

C
phosphate rocks

D
all of the above

Solution

Arsenic is used for the preparation of fertilizers, it is also present in phosphate rocks and it as also released as an industrial waste. When these things are dumped into the water bodies they release arsenic in water.
Question 3
1 / -0

Which of the following are the essential things required for rusting?

A
oxygen

B
water

C
both

D
none of the above

Solution

Rust is an iron oxide a usually red oxide formed by the redox reaction of iron and oxygen in the presence of water or air moisture.
Hence both oxuygen and water are essential things for rusting.
Question 4
1 / -0

Which catalyst is used for the industrial production of hydrogen?

A
Iron

B
Nickel

C
Vanadium pentaxide

D
Palladium

Solution

Nickel catalyst is used for the industrial production of hydrogen.
Question 5
1 / -0

Which of the following is true regarding pure water?

A
Can dissolve anything

B
Higher density than egg

C
Lesser dense than ice

D
None of these

Solution

Pure water is less denser than normal water because, it doesn't contain any soluble impurities. It doesn't dissolve anything. Generally ice is lesser than pure water because, ice expands more on cooling. It is less denser than egg.
Question 6
1 / -0

Deuterium occurs in trace amounts naturally as deuterium gas represented as:

A
$$D_2$$

B
$$^2H_2$$

C
both A and B

D
$$^2D$$

Solution

Deuterium occurs in trace amounts naturally as deuterium gas written as $$D_2$$ as well as $$^2H_2$$.
Question 7
1 / -0

Permanent hardness is caused due to:

A
magnesium bicarbonate

B
magnesium carbonate

C
magnesium sulphate

D
all of the above

Solution

Temporary hardness causes due to the presence of carbonates and bicarbonate ans permanent hardness is caused due to the presence of chlorides and sulphates.
Question 8
1 / -0

Pressure cooker reduces cooking time because:

A
the heat is more evenly distributed inside the cooker

B
a large flame is used

C
boiling point of water is elevated

D
whole matter is converted into steam

Solution

Because under pressure, the heat builds faster and maintains temperature better, so cooking time is reduced. ... The increased pressure inside the cooker increases the boiling point of water above $$100 ^0C$$ so more cooking is done before the water actually starts to boil. So ultimately food is cooked faster.
Question 9
1 / -0

Hydrogen is produced by the reaction:

A
$$Na_2O_2+2HCl$$

B
$$Mg+H_2O$$

C
$$BaO_2+HCl$$

D
$$H_2S_4O_8+H_2O$$

Solution

$$Mg+H_2O\overset{\Delta }{\rightarrow}Mg(OH)_2+H_2$$

It produces magnesium hydroxide and hydrogen gas.
Question 10
1 / -0

Compounds which evaporate easily and easily gives smell are:

A
ionic compounds

B
metallic compounds

C
covalent compounds

D
none of these

Solution

Compounds which evaporate easily and easily gives smell are covalent compounds. Covalent bonds are weak in comparison to ionic bonds.

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Re-Attempt Weekly Quiz Competition

Hydrogen Test - 40

Result

Hydrogen Test - 40

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SHARING IS CARING

Question 1

$$CaCO_3$$

$$Ca(HCO_3)_2$$

$$MgCO_3$$

All of the above

Solution

Question 2

industrial waste

fertilizers

phosphate rocks

all of the above

Solution

Question 3

oxygen

water

both

none of the above

Solution

Question 4

Iron

Nickel

Vanadium pentaxide

Palladium

Solution

Question 5

Can dissolve anything

Higher density than egg

Lesser dense than ice

None of these

Solution

Question 6

$$D_2$$

$$^2H_2$$

both A and B

$$^2D$$

Solution

Question 7

magnesium bicarbonate

magnesium carbonate

magnesium sulphate

all of the above

Solution

Question 8

the heat is more evenly distributed inside the cooker

a large flame is used

boiling point of water is elevated

whole matter is converted into steam

Solution

Question 9

$$Na_2O_2+2HCl$$

$$Mg+H_2O$$

$$BaO_2+HCl$$

$$H_2S_4O_8+H_2O$$

Solution

Question 10

ionic compounds

metallic compounds

covalent compounds

none of these

Solution

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