use strict;
use warnings;

my $x = "foo\n";
my $count = chomp $x;
print "$count\n";

my @arr = ("bar\n", "boo\n");
$count = chomp @arr;
print "$count\n";

__END__

Prints out:
1
2
[download]

Before you ask any more questions, write some code, run the code, and see if you understand the results.

Thanks a lot

1. The value is the total number of characters removed over all list elements passed. If you chomp a scalar, the return value will generally be 0 or 1.
2. It returns this value. You can see this from the code:

   use strict;
   use warnings;
   
   my @input = <DATA>; # Take in the entire file
   
   my $count = chomp @input;
   print "Characters removed: $count\n";
   
   
   __DATA__
   This is some text   
   Each line has a newline   
   That makes 3 total
   [download]

   In general, questions like this can be answered quickly by just creating a mock-up script and playing around.

3. See point 2.

As side notes, since Perl is case sensitive, CHOMP means something different than chomp, though your intent is obvious enough. As well, note chomp is a function (perlfunc), not an operator (perlop). In particular, chomp is a function with side-effects - it changes the variables you pass it. The difference may explain why you were searching for some special Perl variable (perlvar).

If you're trying to figure out a command, write a tiny script. Run it in the debugger: perl -d myscript.pl; You can also run the debugger without any script, to experiment with a command. I use perl -demo because it's memorable, though the 'mo' don't mean anything useful.

chomp() will remove a trailing newline, but not other characters. If passed an array, it will process each element of the array. So if you care, you can use it to determine whether there used to be a newline in the variable. I don't remember ever seeing anyone care, but the potential is there.

  DB<1> $a = "a  \n"

  DB<2> x $a
0  'a  
'
  DB<3> print chomp $a
1
  DB<4> x $a
0  'a  '
  DB<5> print chomp $a
0
  DB<6> x $a
0  'a  '
  DB<7> @a = ( "abc\n", "def\n", "ghi\n" )

  DB<8> x \@a      
0  ARRAY(0x8406258)
   0  'abc
'
   1  'def
'
   2  'ghi
'
  DB<9> print chomp @a
3
  DB<10> x \@a
0  ARRAY(0x8406258)
   0  'abc'
   1  'def'
   2  'ghi'
[download]

1. Is the "value" referred here is the total number of new lines or white spaces which follow that variable

The "value" is the total number of strings removed which are defined by the $/ variable.

2. If so in which location does it stores this value.

It does not store a value but it does return a value which can be assigned to a variable.

3. Can we access this "value" by using any command.

You can assign it to a variable using the assignment operator.