Tag: chemistry

Quizzes (490) Questions (9892)

Questions Related to chemistry

Multiple choice chemistry metals reaction of metals reactions of metals chemical properties of metals

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


In the equation, A and B are :

  1. $Zn$ and $H _2$
  2. $ZnH _{2}$ and $O _{2}$
  3. $ZnO _{2}$ and $H _{2}$
  4. $ZnO$ and $H _{2}$
Reveal answer Fill a bubble to check yourself
D Correct answer
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 $H _2$.

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

Coal found in deeper strata of earth is:

  1. good

  2. bad

  3. can't say

  4. both A and B
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

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

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

  1. Quinoline

  2. Benzene

  3. Toluene

  4. Phenol
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

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

Coal mining has been known, since :

  1. 1750 A.D.

  2. 675 A.D.

  3. Roman times

  4. Mediaeval times
Reveal answer Fill a bubble to check yourself
C Correct answer
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.

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

  1. True

  2. False

  3. Neither

  4. Either
Reveal answer Fill a bubble to check yourself
A Correct answer
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.