Calling dispatch in a sequence in ngrx StateManagement

I have the following code which uses ngrx for state management. I am relatively new to ngrx and while I understand that this.store.select is used to subscribe for any state change , I have the following question.

a) If we call dispatch functions one after the other like the below snippet inside select function, wont this lead to an infinite loop(considering Action1,Action2 refer to altering same State and this.store.select(locationState => locationState.countriesState) keeps getting executed since state changes)? will the third statement be ever called?
Is dispatch a synchronous function?

   this.store.dispatch('Action1');
   this.store.dispatch('Action2');
   this.router.navigation(['/confirm-region'],{relativeTo: this.route.parent })

regioncomponent.ts

    import { Subscription } from 'rxjs/Subscription';
    
    export class RegionComponent implements OnInit,OnDestroy {
    storeSubscriptions =  <Subscription[]>[];
    constructor(private store : Store<TestState>)
    {
    }
    
    ngOnInit() {
     this.storeSubscriptions.push(
this.store.select(locationState => locationState.countriesState).subscribe(state =>
    {
     this.region = state.region,
     
     if(state.Status == true)
     {
       this.store.dispatch('Action1');
       this.store.dispatch('Action2');
       this.router.navigation(['/confirm-region'],{relativeTo: this.route.parent })
    })
    }
}

ReducerList.ts

import {ActionReducerMap} from '@ngrx/store';
    
export interface TestState
{
 countriesState : countriesState
}
export const reducers : ActionReducerMap<TestState> = 
{ 
  countriesState : countriesStateReducer
}

countriesStateReducer.ts

export function countriesReducer(state : countries,action: Action)
{

switch action.type {
 case Action1:..
 case Action2:..
}
}

If we call dispatch functions one after the other like the below snippet inside select function, wont this lead to an infinite loop(considering Action1,Action2 refer to altering same State and this.store.select(locationState => locationState.countriesState) keeps getting executed since state changes)?

It depends. You can break the loop when you unsubscribe from it. And i think the unsubscribe happens in the onDestroy Hook. (Please let me know, if this is wrong, but you example looks like this).
If you never unsubscribe you will come into an infinite loop.

will the third statement be ever called? Is dispatch a synchronous function?

Yes, it will be called. And i think that is the reason, why your code still works without hanging in an indefinite loop.
When you call router.navigate the current component get's destroyed (i guess, but it looks like that, please validate by your own) because another route get's loaded. This means, that the current component unsubscribes from state changes and stops dispatching actions and navigating.