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Answered on 30 Apr Learn Chemistry +1 Unit 10-s -Block Elements (Alkali and Alkaline Earth Metals)

What are the common physical and chemical features of alkali metals? read more

What are the common physical and chemical features of alkali metals? read less

Deepika Agrawal

"Balancing minds, one ledger at a time." "Counting on expertise to balance your knowledge."

Physical properties. The alkali metals have the high thermal and electrical conductivity, lustre, ductility, and malleability that are characteristic of metals. Each alkali metal atom has a single electron in its outermost shell.
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Answered on 30 Apr Learn Chemistry +1 Hydrogen

What is the use of hydrogen in the manufacture of Vanaspati Ghee?

Deepika Agrawal

"Balancing minds, one ledger at a time." "Counting on expertise to balance your knowledge."

The gas used in the manufacture of Vanaspati Ghee from Vanaspati Oil is Hydrogen. At high pressure, in the presence of nickel catalyst, hydrogen is mixed with vegetable oils which turn them into vegetable ghee. This process is called the hydrogenation of oils.
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Answered on 30 Apr Learn Chemistry +1 Hydrogen

Name the phenomenon of adsorption of hydrogen on metal surface.

Deepika Agrawal

"Balancing minds, one ledger at a time." "Counting on expertise to balance your knowledge."

Thus, the process of adsorption of hydrogen on a metal surface is known as Occlusion and the hydrogen is said to be occluded hydrogen.
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Answered on 30 Apr Learn Chemistry +1 Hydrogen

Show how H2O2 junctions both as a reducing and as an oxidising agent. read more
Show how H2O2 junctions both as a reducing and as an oxidising agent. read less

Deepika Agrawal

"Balancing minds, one ledger at a time." "Counting on expertise to balance your knowledge."

H2O2 can be reduced to H2O as well as it can be oxidised to O2. Hence, it can act as an oxidizing agent by itself getting reduced to H2O as well as it can act as a reducing agenct by getting oxidized to O2. Therefore, it can act as oxidizing as well as reducing agent.
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Answered on 30 Apr Learn Chemistry +1 Hydrogen

Explain the following: (i) Temporary hardness can remove by boiling (ii) Soft water lathers with soap... read more
Explain the following:
(i) Temporary hardness can remove by boiling
(ii) Soft water lathers with soap but hard water not. read less

Deepika Agrawal

"Balancing minds, one ledger at a time." "Counting on expertise to balance your knowledge."

Temporary Hardness: Caused by bicarbonates of calcium and magnesium. This hardness can be easily removed by boiling, as the bicarbonates decompose to insoluble carbonates that can be filtered out. Permanent Hardness: A tougher nut to crack, arising from chlorides and sulfates of calcium and magnesium... read more

Temporary Hardness: Caused by bicarbonates of calcium and magnesium. This hardness can be easily removed by boiling, as the bicarbonates decompose to insoluble carbonates that can be filtered out.

Permanent Hardness: A tougher nut to crack, arising from chlorides and sulfates of calcium and magnesium.

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Answered on 30 Apr Learn Chemistry +1 Hydrogen

How is dihydrogen prepared from water by using a reducing agent?

Deepika Agrawal

"Balancing minds, one ledger at a time." "Counting on expertise to balance your knowledge."

By passing steam over red-hot coke: When steam is passed over red-hot coke (carbon) at 1270 K, a mixture of carbon monoxide and dihydrogen called water gas is produced. Dihydrogen is then recovered from water gas either by liquefaction or by Bosch process.
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Answered on 30 Apr Learn Chemistry +1 Hydrogen

Give the industrial use of dihydrogen which depends upon heat liberated when it bums. read more
Give the industrial use of dihydrogen which depends upon heat liberated when it bums. read less

Deepika Agrawal

"Balancing minds, one ledger at a time." "Counting on expertise to balance your knowledge."

Refining process of fossil fuels. Act as a reducing agent for the treatment of metallic ores. It is used in the manufacturing process of different products such as urea, hydrochloric acid, nitric acid, methanol, metal hydrides, hydrogen chloride, and fertilizers.
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Answered on 30 Apr Learn Chemistry +1 Hydrogen

Account for the following: (i) dihydrogen gas is not preferred in balloons. (ii) Cone. H2S04 cannot... read more
Account for the following:
(i) dihydrogen gas is not preferred in balloons.
(ii) Cone. H2S04 cannot be used for drying H2. read less

Deepika Agrawal

"Balancing minds, one ledger at a time." "Counting on expertise to balance your knowledge."

Hydrogen is not preferred in balloons because it is combustible and explosive. It can catch fire readily. To prevent accidents, dihydrogen is not preferred instead helium is preferred in balloons.
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Answered on 30 Apr Learn Chemistry +1 Hydrogen

Calgon, which is used as a water softener, has the formula (a) Na4 (b) Na2 (c) Na2 (d) Na2 read more
Calgon, which is used as a water softener, has the formula
 (a) Na4 [Na2(PO3)6] (b) Na2 [Na4 (PO3)6]
(c) Na2 [Na4 (PO4)5] (d) Na2 [Na2 (PO4)6] read less

Deepika Agrawal

"Balancing minds, one ledger at a time." "Counting on expertise to balance your knowledge."

The formula of calgon is Na2 . Calgon is a trade name of a complex salt- sodium hexametaphosphate. It is used for removal of hardness of water.
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Answered on 30 Apr Learn Chemistry +1 Hydrogen

The higher density of water than that of ice is due to (a) dipole-dipole interaction (b) dipole-induced... read more
The higher density of water than that of ice is due to
(a) dipole-dipole interaction (b) dipole-induced dipole interaction
(c) hydrogen bonding (d) all of these read less

Deepika Agrawal

"Balancing minds, one ledger at a time." "Counting on expertise to balance your knowledge."

hydrogen bonding interactions.
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