No. Oz is not a valid Scrabble word.
No. Qu is not a valid Scrabble word.
Nope. Indew is not a valid Scrabble word.
Yes. Ex is a valid Scrabble word.
Unfortunately VAX is not a scrabble word.
No. Oz is not a valid Scrabble word.
No. Qu is not a valid Scrabble word.
Yes. Speculate is a valid Scrabble word.
Nope. Indew is not a valid Scrabble word.
Yes. Ex is a valid Scrabble word.
Yes, Gaza City is the largest city in the Gaza Strip.
Unfortunately VAX is not a scrabble word.
No. Xe is not a valid Scrabble word.
no
Gaza City is the capital of the Gaza Strip.
No, 'xo' is not a valid word in Scrabble. 'xi, xu, ax, and ox' are some of the valid 2 letter words in Scrabble containing 'x'. 'Xo' is valid only if you are playing Clabbers, a variation of Scrabble where and anagram of a proper word is allowed.
Yes, "ova" is a valid word in Scrabble.