Bissoy.com
Doctors Medicines MCQs Q&A

When we heat lead nitrate [Pb(NO3)2] in a boiling tube, we observe the emission of brown fumes. Which one the following is the brown gas?

When we heat lead nitrate [Pb(NO3)2] in a boiling tube, we observe the emission of brown fumes. Which one the following is the brown gas? Correct Answer NO<sub>2</sub>

The correct answer is NO2.

Key Points

  • Lead nitrate on heating decomposes to lead monoxide, nitrogen dioxide, and oxygen.
    • 2Pb(NO3)2 = 2PbO + 4NO2 + O2.
  • NO2 is liberated, along with oxygen, as a reddish-brown gas.

Important Points

  • It decomposes to produce light yellow solid lead monoxide, reddish-brown nitrogen dioxide gas, and colorless oxygen gas.
  • It is a thermal decomposition reaction.
  • It has an irritating odour.

Related Questions

Which color fumes we observe when we heat lead nitrate?
In a certain town, 40% of people have brown hair, 30% of people have brown eyes and 12% have both brown hair and brown eyes. How many people in town have neither brown hair nor brown eyes?
When conc. H2SO4 is added to dry KNO3, brown fumes are evolved. These fumes are due to
Each question presents a situation and asks you to make a judgement regarding that particular circumstance. Choose an answer based on given information. After Tsunami, Kiran gave an ad for missing husband on the news channel. She gave description of her husband as a tall, grey hair guy, who is in his early 50’s. His eyes are blue and skin tone is brown. Four people who somehow matched the description gathered to meet Kiran. 1. Rohan is a tall, brown guy in his mid-40’s. He has black hair and has black eyes. 2. Gaurav is small, white guy in his late 50’s. He has grey hair and blue eyes. 3. Samay is tall, brown guy in his early 50’s. He has grey hair and blue eyes. 4. Kartik is 5’5’’, brown guys in his early 40’s. He has black hair and brown eyes. Who among the following would be most likely the husband of Kiran?
Consider the following statements for Nucleate boiling: 1. For water, the critical heat flux does not exceed 1 MW/m2. 2. Nucleate boiling is the most desirable boiling regime in practice because of high heat transfer rates. 3. Heat flux increases at a higher rate with increase in temperature. Which of the above statements is/are correct?
The film director wants an actress for the lead role of Lucy who perfectly fits the description that appears in the original screenplay. He is not willing to consider actresses who do not resemble the character as she is described in the screenplay, no matter how talented they are. The screenplay describes Lucy as an average-sized, forty something redhead, with deep brown eyes, very fair skin, and a brilliant smile. The casting agent has four actresses in mind.

Actress #1 : is a stunning red-haired beauty who is 5'9" and in her mid-twenties. Her eyes are brown and she has an olive complexion.
Actress #2 : has red hair, big brown eyes, and a fair complexion. She is in her mid-forties and is 5'5".
Actress #3 : is 5'4" and of medium build. She has red hair, brown eyes, and is in her early forties.
Actress #4 : is a blue-eyed redhead in her early thirties. She's of very slight build and stands at 5'.
Air is to be heated by condensing steam. Two heat exchangers are available (i) a shell and tube heat exchanger and (ii) a finned tube heat exchanger. Tube side heat transfer area are equal in both the cases. The recommended arrangement is
In a counter flow heat exchanger, water flowing through a tube of 10 cm inner diameter is heated by steam condensing on the outside of the tube. The convective film coefficient on the water and steam side are estimated to be 12000 and 20000 k J/m2 hr degree. Neglecting tube thickness and its resistance to heat flow, workout the overall heat transfer coefficient for the heat exchanger
What is the normality of lead (II) nitrate if the density of its 26% (w/w) aqueous solution is 3.105 g/mL? Take molar mass of lead (II) nitrate to be 331g/mol.
A heating unit is made in the form of a vertical tube of 50 mm outside diameter and 1.2 m height. The tube is fitted with 20 steel fins of rectangular section with height 40 mm and thickness 2.5 mm. The temperature at the base of fin is 75 degree Celsius, the surrounding air temperature is 20 degree Celsius and the heat transfer coefficient between the fin as well as the tube surface and the surrounding air is 9.5 W/m2 K. If thermal conductivity of the fin material is 55 W/m K, find the amount of heat transferred from the tube without fin