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
- For a first-order reaction, the ratio between the time taken to complete $\frac{3}{4}$th of the reaction and time taken to complete half of the reaction is
- AP EAPCET - 2025
- Chemistry
- Chemical Kinetics
- The following equation is obtained for a first order reaction at 300 K.
$\log_{10} \frac{k}{A} = 0.00174$ What is the activation energy (in J mol\(^{-1}\)) of the reaction ?
(R = 8.314 J mol\(^{-1}\) K\(^{-1}\))- AP EAPCET - 2025
- Chemistry
- Chemical Kinetics
- $R \to P$ is a first-order reaction. The concentration of R changed from 0.04 to 0.03 mol L$^{-1}$ in 40 minutes. What is the average velocity of the reaction in mol L$^{-1}$ s$^{-1}$?
- AP EAPCET - 2025
- Chemistry
- Chemical Kinetics
- At T(K), the following equation is obtained for a first order reaction.
\[ \log \frac{k}{A} = -\frac{x}{T} \] The activation energy for this reaction is equal to (R = gas constant)- AP EAPCET - 2025
- Chemistry
- Chemical Kinetics
- A → P is a first order reaction. The reaction was started at 10.00 AM. At 10.10 AM, the concentration of A was x mol L-1. At 10.20 AM, the concentration of A was y mol L-1. The half life (in min) of the reaction is equal to:
- AP EAPCET - 2025
- Chemistry
- Chemical Kinetics
Questions Asked in KCET exam
- If the number of terms in the binomial expansion of \((2x + 3)^n\) is 22, then the value of \(n\) is:
- KCET - 2025
- Binomial theorem
- Which of the following statements is/are true about equilibrium?
- KCET - 2025
- Equilibrium
A block of certain mass is placed on a rough floor. The coefficients of static and kinetic friction between the block and the floor are 0.4 and 0.25 respectively. A constant horizontal force \( F = 20 \, \text{N} \) acts on it so that the velocity of the block varies with time according to the following graph. The mass of the block is nearly (Take \( g = 10 \, \text{m/s}^2 \)):
- KCET - 2025
- work, energy and power
- A random experiment has five outcomes \(w_1, w_2, w_3, w_4, w_5\). The probabilities of the occurrence of the outcomes \(w_1, w_2, w_4, w_5\) are respectively \( \frac{1}{6}, a, b, \frac{1}{12} \) such that \(12a + 12b - 1 = 0\). Then the probabilities of occurrence of the outcome \(w_3\) is:
- KCET - 2025
- Probability
A wooden block of mass M lies on a rough floor. Another wooden block of the same mass is hanging from the point O through strings as shown in the figure. To achieve equilibrium, the coefficient of static friction between the block on the floor and the floor itself is
- KCET - 2025
- Newtons Laws of Motion
