An unknown substance turns methyl orange solution red. this shows that the substance is a base. is water. is an acid. is an alkaloid.

Answer : The correct option is, an acid.

Explanation :

Indicators : It is a substance that gives the visible sign by the color change of the chemical species like an acid or a base.

Phenolphthalein, methyl orange, methyl red, etc are the type of acid-base indicators which changes the color based on pH values. They are used in the acid-base titration.

The given indicator is, methyl orange.

The role of methyl orange indicator is that it imparts yellow color to an alkaline or basic solution and it is red color in acidic solution.

From the given problem, we conclude that the unknown solution is acidic in nature that changes the color of a methyl orange indicator from yellow to red.

Hence, the substance is an acid.

the best answer is d because the strong cohesion is caused by the ability of water molecules to undergo hydrogen bonding.

a is incorrect because when water solidifies, it becomes   ice, which expands and occupies a bigger volume for the same mass of water in its liquid state.

b is incorrect because water has high surface tension. besides bonding to itself it hydrogen bonds to other molecules at the top decreasing possibility for breaking of attractive forces.

c is incorrect because the water molecule has oxygen which is highly electronegative and so pulls the electron pair towards itself creating a dipole moment, making the molecule polar.

e is incorrect because water has strong adhesion, ability to stick to other molecules such as glass because of this molecules having stronger hydrogen bonding than water.

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