Which one of the following nitrate will decompose to give NO2 on heating ?
- NaNO3
- KNO3
- RbNO3
- LiNO3
The Correct Option is D
Approach Solution - 1
Lithium nitrate (LiNO₃) decomposes upon heating to form lithium oxide (Li₂O), nitrogen dioxide (NO₂), and oxygen (O₂):
- \(\text{LiNO₃} \xrightarrow{\text{heat}} \text{Li₂O} + 2 \, \text{NO₂} + \text{O₂}\)
In contrast, other alkali metal nitrates like NaNO₃, KNO₃, and RbNO₃ decompose to give alkali metal nitrites (e.g., NaNO₂, KNO₂, RbNO₂) and oxygen, but not NO₂ directly.
Thus, LiNO₃ is the only nitrate among the options that decomposes to release NO₂ on heating, making (D) the correct answer.
Approach Solution -2
Among the alkaline earth metal nitrates, lithium nitrate (LiNO₃) decomposes on heating to form NO₂ and O₂, producing a characteristic brown gas (NO₂). Other nitrates like NaNO₃ and KNO₃ usually decompose to form the respective oxides.
Top Questions on Chemical Kinetics
- Correct statements regarding Arrhenius equation among the following are:
Factor \(e^{-E_a/RT}\) corresponds to fraction of molecules having kinetic energy less than \(E_a\).
At a given temperature, lower the \(E_a\), faster is the reaction.
Increase in temperature by about \(10^\circ\text{C}\) doubles the rate of reaction.
Plot of \(\log k\) vs \(\dfrac{1}{T}\) gives a straight line with slope \(= -\dfrac{E_a}{R}\).
Choose the correct answer from the options given below:- JEE Main - 2026
- Chemistry
- Chemical Kinetics
- Decomposition of A is a first order reaction at T(K) and is given by \( A(g) \rightarrow B(g) + C(g) \).
In a closed 1 L vessel, 1 bar A(g) is allowed to decompose at T(K). After 100 minutes, the total pressure was 1.5 bar. What is the rate constant (in \( min^{-1} \)) of the reaction ? (\( \log 2 = 0.3 \))- JEE Main - 2026
- Chemistry
- Chemical Kinetics
- An organic compound undergoes first order decomposition. The time taken for decomposition to \(\dfrac{1}{8}\) and \(\dfrac{1}{10}\) of its initial concentration are \(t_{1/8}\) and \(t_{1/10}\) respectively. Find the value of \[ \frac{t_{1/8}}{t_{1/10}}\times10 \] (Given: \(\log 2 = 0.3\))
- JEE Main - 2026
- Chemistry
- Chemical Kinetics
Consider the following compounds. Arrange these compounds in a n increasing order of reactivity with nitrating mixture. The correct order is :
- JEE Main - 2026
- Chemistry
- Chemical Kinetics
- At $27^\circ\text{C}$, in presence of a catalyst, activation energy of a reaction is lowered by $10\,\text{kJ mol}^{-1}$. The logarithm of the ratio $\dfrac{k(\text{catalysed})}{k(\text{uncatalysed})}$ is ___.
(Consider that the frequency factor for both the reactions is same)
- JEE Main - 2026
- Chemistry
- Chemical Kinetics
Questions Asked in KCET exam
Match the following:
In the following, \( [x] \) denotes the greatest integer less than or equal to \( x \).
Choose the correct answer from the options given below:- KCET - 2025
- Differentiability
- If \[ y = \frac{\cos x}{1 + \sin x} \] then:
- KCET - 2025
- Differentiability
- A function \( f(x) \) is given by:
\[ f(x) = \begin{cases} \frac{1}{e^x - 1}, & \text{if } x \neq 0 \\ \frac{1}{e^x + 1}, & \text{if } x = 0 \end{cases} \] Then, which of the following is true?- KCET - 2025
- Limits
- The function f(x) is given by:
For x < 0:
f(x) = ex + axFor x ≥ 0:
f(x) = b(x - 1)2
The function is differentiable at x = 0. Then,- KCET - 2025
- Differentiability
- The function \( f(x) = \tan x - x \)
- KCET - 2025
- Derivatives