# Forum

Shivani siva
@shivani-siva
Famed Member
Joined: Aug 6, 2021
Last seen: Sep 10, 2021
Topics: 289 / Replies: 1732
Answer to: The temperature at which oxygen molecules have the same root mean square speed as helium atoms have at 300 K is

Correct answer: (d) 2400 K Explanation: Vrms = Vrms(O2) = Vrms(He) = or = ∴ TO2 = = 2400K

3 years ago
Forum
Answer to: At STP, a container has 1 mole of He, 2 mole Ne, 3 mole O2 and 4 mole N2 without changing total pressure if 2 mole of O2 is removed. The partial pressure of O2 will be decreased by:

Correct answer: (c) 58.33% Explanation: PO2 = x PT After removing 2 mole of O2, P'O2 = x PT Decrease in partial pressure of O2 = x 100 ...

3 years ago
Forum
Answer to: If 10^–4 dm^3 of water is introduced into a 1.0 dm^3 flask at 300 K, how many moles of water are in the vapour phase when equilibrium is established?

Correct answer: (d) 1.27 × 10–3 mol Explanation: From the ideal gas equation : PV = nRT or n = = = 1.27 x 10–3 mol

3 years ago
Forum
Answer to: Two vessels of volumes 16.4 L and 5 L contain two ideal gases of molecular existence at the respective temperature of 27°C and 227°C and exert 1.5 and 4.1 atmospheres respectively.

Correct answer: (a) 2 Explanation: Given conditions V1 = 16.4 L, V2 = 5 L P1 = 1.5 atm, P2 = 4.1 atm T1 = 273 + 27 = 300 K, T2 = 273 + 227...

3 years ago
Forum
Answer to: When CO2 (g) is passed over red hot coke it partially gets reduced to CO(g). Upon passing 0.5 L of CO2 (g) over red hot coke, the total volume of the gases increased to 700 mL.

Correct answer: (a) CO2 = 300 mL; CO = 400 mL Explanation: CO2 + C → 2CO Stoichoimetry ratio is 1 : 2 AT STP, P = 1 atm, T = 273 K, R = 0.0821...

3 years ago
Forum
Answer to: What are the necessary conditions for autotrophic nutrition and what are its by-products?

The conditions necessary for autotrophic nutrition are: (a) Sufficient amounts of carbon dioxide (b) Presence of chlorophyll (c) Sunlight (d) ...

3 years ago
Forum
Answer to: What is the role of saliva in the digestion of food?

Saliva is secreted by the salivary glands present in the cavity of mouth for: Moistening and softening of food for easy crushing by the teeth. Th...

3 years ago
Forum
Answer to: How are fat digested in our bodies? Where does this process take place?

In our bodies, most of the fat digested in small intestine. Here, fat is first emulsified with the help of bile salts. The emulsification of fat conve...

3 years ago
Forum
Answer to: What would be the consequences of a deficiency of haemoglobin in our bodies?

Haemoglobin is the carrier of oxygen. If the haemoglobin becomes deficient, the cells of our body would not be able to obtain sufficient oxygen for re...

3 years ago
Forum
3 years ago
Forum
3 years ago
Forum
3 years ago
Forum
3 years ago
Forum
Answer to: What are the different ways in which glucose is oxidised to provide energy in various organisms?

Glucose is oxidised either aerobically, i.e. in the presence of oxygen or anaerobically, i.e. in the absence of oxygen to provide energy in various li...

3 years ago
Forum
Answer to: How is the amount of urine produced regulated?

The kidney has an effective mechanism to control the urine production. They can reabsorb water from the glomerulus filtrate when the water level of th...

3 years ago
Forum
Answer to: What are the methods used by plants to get rid of excretory products?

(i) Plants get rid of the oxygen produced during photosynthesis by its diffusion through stomata and lenticels. (ii) They get rid of excess water by...

3 years ago
Forum
Answer to: Describe the structure and functioning of nephrons.

The nephron is the basic filtering unit of kidneys. Each kidney has 1-1.5 million nephrons in it. The filtration of blood takes place in Bowman’s ca...

3 years ago
Forum
Answer to: How is food transported in plants?

The food is transported in plants both in upward and downward direction through phloem tissues, which consist of sieve tubes and companion cells. The ...

3 years ago
Forum
Page 1 / 102