List of top Chemistry Questions on Chemical Reactions

 A few sols are given below:
As2S3 sol, starch sol, Al2O3 ·
xH2O sol, TiO2 sol, gold sol, congo red sol, blood, methylene blue sol, CdS sol
The number of positively charged sols in the above list is:

From the following, identify the set that contains all meta directing groups:
The metal having the highest melting point among lanthanides is
Which of the following oxoacids of phosphorus has two P-H bonds?
Which of the following is correct?

Match the following: 

The iodine oxide which is used in the estimation of carbon monoxide is:
The reaction of an acid with a base to give a salt and water is known as
What is the symbol used in a chemical equation to represent the gas evolved in a reaction?
Oxygen gains ____________________ electrons during the chemical changes.
Two of the products formed by the reaction of \(X\) with HCl are gases. What is \(X\)? HCl with \(X\) forms gaseous products, two of which are identified.
What is formed when chlorine gas is passed through slaked lime?
In which of the following reactions, dihydrogen is not evolved?
Which of the following reactions is not a metal displacement reaction?
Identify the products formed when zinc reacts with sodium hydroxide solution. Options:
In the contact process of manufacturing \(\text{H}_2\text{SO}_4\), the arsenic purifier used in the industrial plant contains:
What are X and Y respectively in the following reactions? \includegraphics[]{159.png}

Identify the correct statements from the following:

Oxidation of NaBH_4 with \(I_2\) gives \(B_2H_6\)
(ii) \(B_2H_6\) burns in oxygen and releases an enormous amount of energy 
(iii) \(B_2H_6\) on hydrolysis gives a tribasic acid

The proper conditions of storing \( H_2O_2 \) are:

(1) Placing in wax-lined plastic bottle and kept in a dark
(2) Placing in a wax-lined plastic bottle and exposed to light
(3) Placing in a wax-lined plastic bottle containing traces of base
(4) Placing in metal vessel and exposed to light

What are \( X \) and \( Y \) respectively in the following reactions?

X → CO B2H6 → NaH → (C2H5)2O Y

Options:

  • (1) BH3, 2CO; NaBO2
  • (2) BH3, CO; NaBH4
  • (3) BH3, CO; NaBO2
  • (4) BH3, CO; Na2B4O7

Arrange the following in increasing order of their crystal field splitting energy: 

Which of the following is used in liquid detergents?
Given below are the two statements regarding chlorobenzene
Statement I: Chlorobenzene is less reactive than benzene towards electrophilic substitution due to the -I effect of chlorine.
Statement II: Because of the -I effect of chlorine, it is a meta directing group.
In the given sequence of reactions: \[ \text{P}_4 + \text{NaOH} + \text{H}_2\text{O} \;\longrightarrow\; \dots \;\longrightarrow\; X \;+\; 2\,\text{NaH}_2\text{PO}_2 \;\longrightarrow\; \dots \] The final product obtained with copper and \(\text{H}_2\text{SO}_4\) is:
What is the purpose of adding gypsum to cement?