Question

We can change the name of the saved file.
A saved file cannot be opened again in Writer.
A file created and saved in Open office Writer is cal
The file saved in Writer has an extension of .png​

Answer 1

Explanation:

You can create a new, blank document in Writer in several ways:

Press the Control+N keys. A new empty document opens. ...

Use File > New > Text Document. The result is the same as pressing the Control+N keys.

Click the New button on the main toolbar

OpenOffice uses ODF format as its default document format. Most other word processors, of recent vintage, also have the ability to import and export ODF.