Chemistry

Chemical Reactions and Processes

571 Questions

Chemical reactions and processes questions cover the transformation of substances through electrolysis, thermal decomposition, and catalysis. Key areas include identifying gas evolution, balancing chemical equations, and understanding industrial chemical applications. This general chemistry topic is a staple in the science sections of multiple competitive examinations.

Thermal decompositionElectrolysis processGas evolution reactionsHeterogeneous catalystsFuel cell components

Chemical Reactions and Processes Questions

Multiple choice chemistry chemistry in everyday life metal oxides and non metal oxides reactions of acids and bases properties of acids and bases

Sulphuric acid reacts with cupric oxide to give:

  1. copper sulphate

  2. cuprous sulphate

  3. no reaction

  4. it converts to cuprous oxide.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

$H _2SO _4 + CuO \rightarrow CuSO _4 + H _2O$


Sulphuric acid reacts with cupric oxide to give copper sulphate and water. 

Hence, the correct option is $\text{A}$

Multiple choice chemistry chemistry in everyday life metal oxides and non metal oxides reactions of acids and bases properties of acids and bases

The reaction between copper oxide and nitric acid forms:

  1. copper nitrate and hydrogen

  2. copper nitrite and water

  3. copper nitrite and hydrogen

  4. copper nitrate and water
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

$CuO + 2HNO _3 \rightarrow Cu(NO _3) _2 + H _2O$

Copper oxide and nitric acid react to give copper nitrate and water.

Multiple choice chemistry chemistry in everyday life metal oxides and non metal oxides reactions of acids and bases properties of acids and bases

Carbon dioxide reacts with calcium hydroxide to form ________.

  1. calcium carbonate

  2. calcium oxide

  3. calcium hydrogen carbonate

  4. calcium metal
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Carbon dioxide reacts with calcium hydroxide to form calcium carbonate and water.
$\displaystyle Ca(OH) _2 + CO _2 \rightarrow CaCO _3 + H _2O$

Multiple choice chemistry chemistry in everyday life metal oxides and non metal oxides reactions of acids and bases properties of acids and bases

Carbon dioxide reacts with calcium hydroxide to form calcium carbonate and water.
$\displaystyle Ca(OH) 2 + CO _2 \rightarrow CaCO _3 + H _2O$
From this reaction, we can conclude that $CO _2$ is _________.

  1. acidic

  2. basic

  3. amphoteric

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

In the given reaction calcium hydroxide which is a base reacts with carbon dioxide to give salt and water. So, carbon dioxide will be acidic in nature because acid and base reacts to give salt and water. nature.

Multiple choice chemistry chemistry in everyday life metal oxides and non metal oxides reactions of acids and bases properties of acids and bases

Which of the following represents the products obtained when $MgO$ reacts with $HCl$?

  1. $MgCl _2$ and water
  2. $MgCl$ and water
  3. $MgCl _2$ and hydrogen
  4. $MgCl$ and hydrogen
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

When $MgO$ reacts with $HCl$, the products obtained are $MgCl _2$ and water.


$MgO + 2HCl \rightarrow MgCl _2 + H _2O$

This demonstration can be used to illustrate the characteristic reaction of metals with acid, a single replacement reaction, or to demonstrate the generation of hydrogen gas. The flammability of hydrogen gas can be demonstrated by carefully holding a match or fireplace lighter up to the popping hydrogen bubbles. An audible crackling sound is heard as the hydrogen burns.

Hence, the correct option is $A$

Multiple choice chemistry chemistry in everyday life metal oxides and non metal oxides reactions of acids and bases properties of acids and bases

From the reaction of $NaOH$ with sulphur dioxide, what can be concluded about the nature of sulphur dioxide?

  1. It is acidic in nature

  2. It is basic in nature

  3. It is amphoteric in nature

  4. It is neutral in nature
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

We can conclude that sulphr dioxide is acidic in nature as it reacts with a base $(NaOH)$ to form salt and water.
$SO _2 + NaOH \rightarrow NaHSO _3$
$SO _2 + 2NaOH \rightarrow  Na _2SO _3 + H _2O$

Multiple choice chemistry chemistry in everyday life metal oxides and non metal oxides reactions of acids and bases properties of acids and bases

The equation for the action of a dilute acid on a metal oxide is following:

     Metal oxide + dilute acid $\rightarrow$ Metal salt + Water

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Given statement is true. Since water is also formed along with salt .

An example is given below.

$CaO+{ 2HNO } _{ 3 }\rightarrow Ca\left( { NO } _{ 3 } \right) _{ 2 }+{ H } _{ 2 }O$

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

A metal which reacts with cold water vigorously producing hydrogen is:

  1. zinc

  2. hydrogen

  3. sodium

  4. mercury
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

All the alkali metals react vigorously with cold water. In each reaction, hydrogen gas is given off and the metal hydroxide is produced. The speed and violence of the reaction increases as you go down the group. This shows that the reactivity of thealkali metals increases as you go down group 1. And sodium is a group 1 element.

The correct option is C.