The phrase "ask one group" is correct and usable in written English.
You can use it when referring to the action of requesting information or opinions from a specific group of people.
Example: "To gather diverse perspectives, we decided to ask one group about their experiences with the new policy."
Alternatives: "inquire of one group" or "request from one group".
Ask one group to work on encouraging and the other on discouraging situations.
Ask one group to just read the text of the article and ask for their opinions on the article.
When I ask one group of workers and their friends about coal, it sets off a chain of comments that spin into a long political argument – all polite.
Ask one group of parents in Haringey, who discovered just before Christmas that their council would be implementing sweeping cuts to services for people with severe learning disabilities and autism.
While the students collect data, the instructor would ask one group why either of the basic models developed so far in the class (prokaryotic or plant cell model) do not apply to this current cell phenomenon.
The first is, does it only ask one group to act?
A second study, with different participants, asked one group of people to 20 minutes on Facebook -- posting status updates, chatting with friends and scanning their News Feeds -- while another group spent 20 minutes browsing the Internet without visiting any social media sites.
In a seemingly unrelated matter, she asked one group to choose between two prints to hang on an office wall.
Before participants did this, Senay asked one group to simply think about whether they would work on anagrams, and he asked the other groups to think about the fact that they would be doing anagrams soon.
We asked one group (we'll call these people "predictors") how well test-takers would do.
Then she asked one group to suppress the emotions they felt about that hurt, while she asked another group to try to think about that person with compassion.
