A solution of white solid (A) gave white precipitate (B) with water. On treatment with HCl, the ppt B produced A. The solution of A gives black precipitate (C) on reacting with sodium stanite and NaOH The compound A gives a colourless gas (D) with concentrated H, SO4. The gas is soluble in water and its aqueous solution produce with it precipitate with Hy, (NO3), but no precipitate with Hg(NO3)2. Identify (A) to (D) and write the chemical reactions involved​

Answer:

The correct answer is option D

Explanation:

Glossopteris is significant for understanding Earth's geological history and scientific theories. Scientist Alfred Wegener suggested that the continents were previously connected to form a supercontinent known as Pangaea around the turn of the 20th century. Wegener proposed a theory known as the Continental Drift Theory, according to which the continents split up and migrated to their present-day positions. As seen in the picture and detailed below, there is proof for his assertion on each of the continents:

The continents fit together like jigsaw pieces.

• Glacial grooves (striations) correspond to neighbouring continents.
• Mountain ranges and coal reserves correspond to nearby continents.
• On adjacent continents, fossils of Glossopteris and reptiles Lystrosaurus, Cynognathus, and Mesosaurus were discovered.
• Glossopteris seeds were too large to be dispersed by the wind.
• Only capable to swimming in fresh water, Mesosaurus could not survive an ocean voyage.
• Because they couldn't swim, Lystrosaurus and Cynognathus couldn't survive an ocean voyage.

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Answer:

option d because the velocity of water is at 10 power 3 and river is in 5m deep

Given:

• the velocity of water in the river is 5m/s at the surface
• The viscosity of water is 10^-3
• The river is 5m deep

To find: what is viscous forces per unit area between a horizontal layer of water?

Explanation:

as we know that,

velocity at the bottom of the river will be zero,

Velocity gradient,

                           =  dv/dy

                           = 18×[tex]10^{3} [/tex]/60×60×5

                           = 1[tex]s^{-1} [/tex]

Now,

The viscous force,

                         F = ηA[tex]\frac{dv}{dY} [/tex]  is tangential to the area

by using the formula of Shear stress,

                          = F/A

                          = η[tex]\frac{dv}{dY} [/tex]

                          = [tex]10^{-3} [/tex]×1

                          = [tex]10^{-3} [/tex] [tex]\frac{N}{m^{2} } [/tex]

Hence the viscous force is [tex]10^{-3} [/tex] [tex]\frac{N}{m^{2} } [/tex]

Answer:

It is seen as a part of artificial intelligence. Machine learning algorithms build a model based on sample data, known as training data, in order to make predictions or decisions without being explicitly programmed to do so.

Answer:

Explanation:

[Machine learning algorithms] build a model based on sample data, known as training data, in order to make predictions or decisions without being explicitly programmed to do so.

Answer:

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