Answer:
What do you call the motherยญ-in-ยญlaw of your sister's husband?
What can be measured but has no length, width or height?
Where can you add 2 to 11 and get 1?
What instrument plays from the heart?
What has ten letters and starts with gas?
Black we are and much admired. Many seek us if they are tired. We tire the horse, and comfort man, and turn White when we've fulfilled your plan.