Physics, Chemistry and Biology: Post your doubts here!

[Awesome12]

can anyone please post the details for the experiment in physics done on refraction using a rectangular glass block and optical pins..all care that should be taken + possible errors that might occur.. please post .. will be very thankful

 

[Ameena Eesa]

Can anyone please describe the formation of ethanoic acid by the oxidation of ethanol with acid. KMnO4?

 

[shoaib672002]

View attachment 40854

 

[Awesome12]

 

[shoaib672002]

Ur signature *Down arrow green*

 

[shoaib672002]

shoaib672002
shoaib672002 just one more thng when we need to draw do we need to draw on diagram or in space provided and if on space provided do we need to draw full diagram or just set of squares and yes how can we explain set of squares like should we write use set of squares to check whether it is horizontal and to avoid parallax error is this sentence right or do we need to write smthng else thank u

Yes If space is given u draw full and if no space is there then just on the diagram we can explain set squares as a set of set squares can be placed below the rule to make sure its horizontal , also u can mention the use of fiducial aid

 

[shoaib672002]

thanx a lot bro u rele helped a lot

Ur welcome just remember me in ur duas , Even I have exams U knw and U still sitting in ur house , Brofist

 

[Ameena Eesa]

I can't get them. Kindly explain..................

 

[princess sofia]

I can't get them. Kindly explain..................

first one , if the electrolyte is aqueous so metal would remain in the solution cze hydrogen is lower than those metals in reactivity series
so da ans is D
second one , c litmus becomes colourless thx means it was bleached , it cn b bleached by chlorine , chlorine is released at anode
so ans is D
hope it helped

 

[Ameena Eesa]

Will be a great help if anyone explains me the answers to these questions..................

 

[Ameena Eesa]

first one , if the electrolyte is aqueous so metal would remain in the solution cze hydrogen is lower than those metals in reactivity series
so da ans is D
second one , c litmus becomes colourless thx means it was bleached , it cn b bleached by chlorine , chlorine is released at anode
so ans is D
hope it helped

Thankkkkkkkkkkkkkxx!

 

[Mavilda Bucket]

cud u pls explain d reason for this ans

 

[Mavilda Bucket]

and this too

 

[Ameena Eesa]

View attachment 40869

cud u pls explain d reason for this ans

As we know, maggots will respire, which will use up any amount of oxygen in the test tube and simultaneously release carbon dioxide in it. The volume, however, becomes less after some time, as oxygen is used up, and excess CO2 has been built. Thus, we can say that the maggots die, and the drop of colored liquid recedes.

 

[Ameena Eesa]

View attachment 40870

and this too

Firstly, you need to know that three marks are alloted for each subtitled question.
Find the keys in the question itself.
For evidence, you can state that, as currently, they are talking about exposure to oxygen, the cut surface has reacted with oxygen and has gotten oxidised. Talk about color change. You can also support this fact by the evidence that the cooked apple did'nt change color, which means that it did'nt react. (Explnation) It also will mean that now enzymes were involved, because the heat had destroyed them..........

 

[princess sofia]

View attachment 40869

cud u pls explain d reason for this ans

the maggots wll respire absorbing oxygen n giving out CO2 . bt CO2 is absorbed by soda lime hence there is net decrease in volume of air as a result suction is created which cause the drop of colur to move towards the test tube

 

[Ameena Eesa]

Explain plzzzz///////////// of how the method can b used to separate the two

 

[Ameena Eesa]

How can i deduce the formula?..............

 

[princess sofia]

Explain plzzzz///////////// of how the method can b used to separate the two

crystallization ll be used
1. first heat the solution in an evaporating dish till point of crystallization
2. cool it untill crystals r formed
3. filter the crystals
4. wash wth distilled water
5. dry using filter paper

 

[Ameena Eesa]

crystallization ll be used
1. first heat the solution in an evaporating dish till point of crystallization
2. cool it untill crystals r formed
3. filter the crystals
4. wash wth distilled water
5. dry using filter paper

but they are mixed!