There is 2 test tube containing sodium chloride and sodium sulphate solution respectively suggest a method to know which is Sodium sulphur​

These two solutions react to form a white insoluble precipitate.

Explanation:

BaCl  

2

​

+Na  

2

​

SO  

4

​ →2NaCl+BaSO  

4

​

↓  

This is a double displacement reaction as the two compounds exchange their ions to form two different compounds.

hey, i believe your answer would be d. sugar ribose and the base uracil. i believe this is the answer, because rna consists of sugar ribose, adenine, guanine, cytosine, and uracil.

your first option is incorrect, because that's dna. where it consists of sugar deoxyribose, adenine, guanine, cytosine and thymine.

your second option is also incorrect, this is because sugar deoxyribose is in dna, and uracil is in rna. these two do not make sense together.

your third option being incorrect, because sugar ribose is in rna, but not the base of thymine. rna consists of uracil, not thymine.

lastly your fourth option being correct! this answer is correct, because both sugar ribose, and the base uracil are in rna! ~

answer is d. sugar ribose and the base uracil.

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hope this you! : )

(i popped my answer into google translate so it may be a bit wonky)