Tag: chemistry

Questions Related to chemistry

$Zn + H _{2}O$ (steam) $\longrightarrow  A + B$


In the equation, A and B are :

chemistry metals reaction of metals reactions of metals chemical properties of metals

  1. $Zn$ and $H _2$

  2. $ZnH _{2}$ and $O _{2}$

  3. $ZnO _{2}$ and $H _{2}$

  4. $ZnO$ and $H _{2}$

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Correct Option: D
Explanation:

Zinc only when heated replaces hydrogen from steam thus forming oxides.

$Zn(s) +H _{2}O(g) \xrightarrow[\text{Above}\; 400^oC]{\Delta} ZnO(s)+H _2(g)$ .

Thus, the compounds A and B are $ZnO$ and $H _2$.

What is the main constituent of coal?

chemistry rocks and minerals carbon cycling mineral coal coal and its products

  1. Hydrogen

  2. Oxygen

  3. Carbon

  4. Nitrogen

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Correct Option: C
Explanation:

Carbon is the main constituent of coal. Thus, coal is considered as an organic compound.

Coal found in deeper strata of earth is:

chemistry rocks and minerals carbon cycling mineral coal coal and its products

  1. good

  2. bad

  3. can't say

  4. both A and B

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Correct Option: A
Explanation:

It has been seen that the deeper the coal found, the better quality it is. Because, the deeper we go, the temperature and pressure increases much and hence the quality of coal also increases.

The process of conversion of dead vegetation into coal is termed as:

chemistry rocks and minerals carbon cycling mineral coal coal and its products

  1. precipitation

  2. reduction

  3. oxidation

  4. carbonization

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Correct Option: D
Explanation:

Coal is mainly made up of carbon.Thus, the conversion of dead vegetation into coal is termed as carbonization.

Which of the following is basic compound present in coal tar?

chemistry rocks and minerals carbon cycling mineral coal coal and its products

  1. Quinoline

  2. Benzene

  3. Toluene

  4. Phenol

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Correct Option: A
Explanation:

Quinoline is basic compound present in coal tar. Other basic compound present in coal tar is pyridine. 

Benzene and toluene are neutral compounds. 
Phenol is acidic compound.

The main constituent of coal is:

chemistry rocks and minerals carbon cycling mineral coal coal and its products

  1. carbon

  2. oxygen

  3. air

  4. water

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Correct Option: A
Explanation:

The main constituent of coal is $carbon$,

State whether the given statement is true or false:

Under high temperature and pressure, dead plants get slowly converted to coal.
chemistry rocks and minerals carbon cycling mineral coal coal and its products

  1. True

  2. False

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Correct Option: A
Explanation:

Under favorable conditions of high temperature and pressure, dead plants get slowly converted to coal.

From where mineral coal is obtained in Gujarat?

chemistry rocks and minerals carbon cycling mineral coal coal and its products

  1. Ankleshwar

  2. Khambat

  3. Thangadh

  4. Kalol

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Correct Option: C
Explanation:

In Gujarat, near Thangadh in Saurashtra district, sulphur-containing mineral coal deposits are present.

Coal mining has been known, since :

chemistry rocks and minerals carbon cycling mineral coal coal and its products

  1. 1750 A.D.

  2. 675 A.D.

  3. Roman times

  4. Mediaeval times

Show answer
Correct Option: C
Explanation:

In Roman Britain, the Romans were exploiting all major coalfields by the late 2nd century AD. While much of its use remained local, a lively trade developed along the North Sea coast. This also extended to the continental Rhineland, where bituminous coal was already used for the smelting of iron ore. After the Romans left Britain, in AD 410, there are few records of coal being used in the country until the end of the 12th century.

Coal is a sedimentary rock formed from plants that died a millions of years ago.
chemistry rocks and minerals carbon cycling mineral coal coal and its products

  1. True

  2. False

  3. Neither

  4. Either

Show answer
Correct Option: A
Explanation:

Coal is a sedimentary rock formed from plants that died millions of years ago.

As more and more layers of dead plants and animals got deposited on them, due to heat and pressure they changed to form coal.

Hence, option (A) is the correct answer.