Change single and multiple values in JSON using jq

Let's suppose we have a following 1.json:

{
   name: 'abcd',
   age: 30,
   address: 'abc'
}

To change a single item of the JSON:

jq '.address = "abcde"' 1.json > 1_modified.json

To change multiple items:

jq '.age = 20 | .address = "abcde"' 1.json > 1_modified.json