The part of the sentence "it is valid to ask" is correct and can be used in written English.
You could use it when expressing the idea that it is acceptable to inquire about something or to make a request. For example, "Given the circumstances, it is valid to ask for financial assistance."
So, given this background, it is valid to ask: Is the New York Times committed to informing the American people about the actions of their government or is it more concerned about keeping its place at the table of the powerful?
When a person's altruistic impulses are directed toward winning converts, it is valid to ask whether they are actually serving human well-being or simply serving a mind virus.
It is valid to ask whether we have found any genes that should be named aod (AOX deficient).
Because of this, it is valid to ask whether the current network structure of metabolism may be efficiently related to gene essentiality?
Since the therapeutic effects of hawthorn preparations appear to be mediated by the metabolome (notably, phenolic compounds; Edwards et al. 2012; Yang and Liu 2012), it is valid to ask to what extent the variation in the metabolomes of Crataegus species parallels the variation in DNA sequences.
The figure is lower than for the year to May 2012 when it was 1747, so it's valid to ask if we're seeing a temporary increase or a sustained upward trend.
However, Collins nevertheless defended this use of parliamentary privilege, saying it was valid to ask if the FA had investigated, despite Puncheon having withdrawn the comments, because the allegations were "very specific", and there might have been something in them.
But it's valid to ask how we can reconcile our stance on anti-harassment with statements made on stage at our event.
With so much music being streamed, swapped and downloaded from so many outlets these days, it's valid to ask whether we can arrive at any sort of Grammy consensus.
It is therefore valid to ask: whose interest do these events actually serve?
It is completely valid to ask why the media even give the likes of McCarthy or Silverstone a platform to dispense their opinions, given the harmful effects of their misinformation campaign.
