List of top Chemistry Questions

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason $R$:
Assertion A: Acetal / Ketal is stable in basic medium
Reason R: The high leaving tendency of alkoxide ion gives the stability to acetal ketal in basic medium
In the light of the above statements, choose the correct answer from the options given below :

The IUPAC nomenclature of an element with electronic configuration $[ Rn ] 5 f ^{14} 6 d ^1 7 s ^2$ is :

A gas has a compressibility factor of 0.5 and a molar volume of 0.4 dm³ mol⁻¹ at a temperature of 800K and pressure x atm. If it shows ideal gas behavior at the same temperature and pressure, the molar volume will be y dm³ mol⁻¹. The value of \(\frac{x}{y}\) is ___. [Use: Gas constant, R = 8 × 10⁻² L atm K⁻¹ mol⁻¹]

Answer the question on the basis of passage given below:
There are three kinds of amines which are primary, secondary and tertiary amines. These amines may have alicyl group or aryl group or both alkyl and aryl groups. These amines can be distinguished from one another by various chemical tests.

Answer the question on the basis of passage given below:
Oxides formed by p-block elements are acidic, basic and neutral. Also, elements of p-block form different acids

In the reaction given below ‘B’ is:

Which of the following is a physical change?

$SO _2 Cl _2$ on reaction with excess of water results into acidic mixture $SO _2 Cl _2+2 H _2 O \rightarrow H _2 SO _4+2 HCl$ 16 moles of $NaOH$ is required for the complete neutralisation of the resultant acidic mixture The number of moles of $SO _2 Cl _2$ used is :

Which of the following ore is not in oxide form?

High purity $(>9995 \%)$ dihydrogen is obtained by

In a first order reaction, the concentration of the reactant becomes 0.0625 of its initial concentration after 2 hours. The half-life of the reaction is given by

The molar conductivity of a conductivity cell filled with $10$ moles of $20\, mL\, NaCl$ solution is $\Lambda_{ m 1}$ and that of $20$ moles another identical cell heaving $80 \, mL \, NaCl$ solution is $\Lambda_{ m 2}$, The conductivities exhibited by these two cells are same The relationship between $\Lambda_{ m 2}$ and $\Lambda_{ m 1}$ is

Consider the following molecules: Br₃O_8, F₂O, H₂S₄O₆, H₂S₅O₆, and C₃O_2. Count the number of atoms existing in their zero oxidation state in each molecule. Their sum is____.

A cubic solid is made up of two elements $X$ and $Y$ Atoms of $X$ are present on every alternate corner and one at the center of cube $Y$ is at $\frac{1}{3} rd$ of the total faces. The empirical formula of the compound is

' $25$ volume' hydrogen peroxide means

$Ka _1, Ka _2$ and $Ka _3$ are the respective ionization constants for the following reactions (a), (b) and (c)
(a) $H _2 C _2 O _4 \rightleftharpoons H ^{+}+ HC _2 O _4^{-}$
(b) $HC _2 O _4^{-} \rightleftharpoons H ^{+}+ HC _2 O _4^{2-}$
(c) $H _2 C _2 O _4 \rightleftharpoons 2 H ^{+}+ C _2 O _4^{2-}$
The relationship between $K _{ a _1}, K _{ a _2}$ and $K _{ a _3}$ is given as

Increasing order of stability of the resonance structures is: Choose the correct answer from the options given below:

The $Cl - Co - Cl$ bond angle values in a fac- $\left[ Co \left( NH _3\right)_3 Cl _3\right]$ complex is/are:

Given below are two statements, one is labelled as Assertion $A$ and the other is labelled as Reason R 
Assertion A : Butylated hydroxy anisole when added to butter increases its shelf life
Reason R : Butylated hydroxy anisole is more reactive towards oxygen than food
In the light of the above statements,choose the most appropriate answer from the options given below

Which one of the following reactions does not occur during extraction of copper?

For micelle formation, which of the following statements are correct?
(A) Micelle formation is an exothermic process
(B) Micelle formation is an endothermic process
(C) The entropy change is positive
(D) The entropy change is negative