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Interstitial vs AppOpenAds android

Can someone explain as I can't seems to find a proper post about why use Interstitial or AppOpen ad for fullscreen impression exclusively?
I have read google doc, guidelines and already have experience implementing both types of ads, however why shouldn't I just use Interstitial everywhere where I need fullscreen ad including initial loading and vice versa why shouldn't I use appOpen for transitioning?
Will my app be banned by google if I will show appOpen between nav destinations? Should I prefer certain type for maximizing revenue? Is there any technical difference s in caching/requesting/showing ads.
I just don't understand need in having 2 types of fullscreen ads in my apps as well as I can't find proper discussion about why should I prefer one of them or being unreplaceable one by another.

Interstitial vs AppOpenAds android
AppOpenAds use when user pause an app then come back in the app so app open ad show while on the other hand Interstitial add are typically displayed at natural transition points in the flow of an app, such as between activities.

Google AdMob banner ad in NavigationDrawer

I couldn't find a solid answer for that:
is it valid to put AdMob banner ad inside NavigationDrawer (the drawer shrinks a bit the size of the banner), or is it violates the policy of AdMob?

I don't think it's a good idea to place it there.
So first of all, why do you have an Ad in your app? - To get some revenue from displaying it of course!
Your approach isn't ideal because:
Not all users will click the navigation drawer button in order to see the info you display there, including the ad;
Unless you live in US, you are not getting paid from people just viewing your banner, you need clicks in order to get revenue.
In my opinion, just place the add at the bottom of your activity, like I did in this image.

Can admob banner ads be applied on Dialog? Or its against google ads placement policies

I have custom dialog in my app, they popup when some event occur.
I am thinking to put banner ads on my app dialog popups.
Will that be a good practice ,or its against google banner ads placement policy ?

Even I had the same problem. You cannot use them in Dialog box as the ads wont appear.

This could work (you can display an AdView in a PopupWindow, for example), but if the dialogs come up quickly and disappear quickly, it doesn't give the user much time to see and interact with the banner, which can lead to lower clickthrough rates and less revenue for you.
I'd recommend looking at our Interstitial format. You could load them in advance, and display them when the user closes a dialog. If the dialogs are really frequent, you could only show an ad every fifth time, etc.

I've seen many games and apps that have ads on dialog boxes, so it's possible to do so.

Is Admob Interstitial open button valid?

I have an Android education App where user can hold "tokens" to earn new contents and features.
I searched at Admob documentation but the information seems to be not very clear about my situation.
In case to create a button to open Admob interstitial in return of any tokens mentioned above (I'm thinking make this feature periodic), should it generate invalid traffic or break any admob rule? Anyone tried it before?
My doubt consist in the fact that it does not generate invalid clicks, it just improve the number of interstitials showed.
Thanks in advice.

Ok, concerning to your reply I'm pretty sure that this is not allowed. What I can tell you for sure is that you must not reward people for clicking your ads (or even a button which shows ads).
In addition to it, this is not a "natural transition point". Read what AdMob proposes about showing interstitials: https://developers.google.com/admob/android/interstitial?hl=en#some_best_practices

Best Practice: AdMob ads at top or bottom?

So, I just integrated AdMob into my application. Now, I'm wondering whether to place the Ads on the top of the screen or the bottom.
Aesthetically, I think the App looks better with the ads on the bottom of the screen.
However, the little devil in me is thinking that there's more likelihood of people clicking on the ads by mistake (thereby increasing my click count), if I place them at the top since that's where I have the action bar.
Of course people who genuinely want to click on ads will click them no matter where I place them.
Can anyone share their experience in this regard?

The AdMob Publisher Guidelines cover this:
Ads should not be placed very close to or underneath buttons or any other object which users may accidentally click while interacting with your application.
and also:
Ads should not be placed in areas where users will randomly click or place their fingers on the screen. For applications that involve this type of interaction, we recommend implementing our ads on a title or ending page.
As others have mentioned, place ads where they will not be accidentally hit.

Of course people will be more likely to click your ad (accidentally or on purpose), but your customer's satisfaction will also be likely to drop (especially when someone accidentally hits your ad). When an ad affects the usability of an app the chance that a user will delete your app is quite likely, which results in nil income.
If you really need to incorporate ads in your app, I would place them at a place where the user is the least likely to accidentally tap them. As the iPhone's screen is not that large, in terms of visibility this will not have any serious effect. (I personally dislike any app that uses ads and especially AdMob ads, but that is a personal note).

With the soft buttons found on many of the latest phones I don't think positioning your ads at the top of the screen will increase your CTR, as users are likely just as likely to accidentally touch ads at the bottom of the screen.
Go with where you think the ad looks better (most likely the bottom).