Every Book Back multiple-choice question from Solutions (10th Standard Science, Samacheer Kalvi) — each with the correct option highlighted and a clear, worked explanation. Free to read in English and Tamil.
Q1
A solution is a __________ mixture.
- A. homogeneousCorrect
- B. heterogeneous
- C. homogeneous and heterogeneous
- D. non homogeneous
Explanation. A solution is defined as a homogeneous mixture of two or more substances, where the solute is uniformly distributed in the solvent.
Q2
The number of components in a binary solution is __________
- A. 2Correct
- B. 3
- C. 4
- D. 5
Explanation. A binary solution is composed of exactly two components: one solute and one solvent.
Q3
Which of the following is the universal solvent?
- A. Acetone
- B. Benzene
- C. WaterCorrect
- D. Alcohol
Explanation. Water is known as the universal solvent because of its ability to dissolve a wide variety of solute substances.
Q4
A solution in which no more solute can be dissolved in a definite amount of solvent at a given temperature is called _______
- A. Saturated solutionCorrect
- B. Un saturated solution
- C. Super saturated solution
- D. Dilute solution
Explanation. A saturated solution represents a state of dynamic equilibrium where no additional solute can dissolve in the given amount of solvent at that temperature.
Q5
Identify the non aqueous solution.
- A. sodium chloride in water
- B. glucose in water
- C. copper sulphate in water
- D. sulphur in carbon-di-sulphideCorrect
Explanation. A non-aqueous solution uses a solvent other than water. Sulphur dissolved in carbon disulphide is a non-aqueous solution, whereas the other options use water as the solvent.
Q6
When pressure is increased at constant temperature the solubility of gases in liquid __________.
- A. No change
- B. increasesCorrect
- C. decreases
- D. no reaction
Explanation. According to Henry's law, the solubility of a gas in a liquid is directly proportional to the pressure of the gas above the liquid.
Q7
Solubility of NaCl in 100 ml water is 36 g. If 25 g of salt is dissolved in 100 ml of water how much more salt is required for saturation _____________.
- A. 12g
- B. 11gCorrect
- C. 16g
- D. 20g
Explanation. To achieve saturation, 36 g of NaCl is required in 100 ml of water. Since 25 g is already dissolved, the additional mass needed is 36 g minus 25 g, which is 11 g.
Q8
A 25% alcohol solution means
- A. 25 ml alcohol in 100 ml of water
- B. 25 ml alcohol in 25 ml of water
- C. 25 ml alcohol in 75 ml of waterCorrect
- D. 75 ml alcohol in 25 ml of water
Explanation. A 25% alcohol solution by volume contains 25 ml of alcohol (solute) dissolved in 75 ml of water (solvent) to make a total volume of 100 ml of solution.
Q9
Deliquescence is due to __________
- A. Strong affinity to waterCorrect
- B. Less affinity to water
- C. Strong hatred to water
- D. Inertness to water
Explanation. Deliquescent substances have a very strong affinity for atmospheric moisture, absorbing enough water to completely dissolve and form a saturated solution.
Q10
Which of the following is hygroscopic in nature?
- A. ferric chloride
- B. copper sulphate penta hydrate
- C. silica gelCorrect
- D. none of the above
Explanation. Silica gel is hygroscopic because it absorbs moisture from the atmosphere without changing its physical state, unlike ferric chloride which is deliquescent.
About these Solutions questions
These are the Book Back multiple-choice questions for Solutions from the Tamil Nadu State Board (Samacheer Kalvi) 10th Standard Science syllabus. Each question shows the correct option and an original, step-by-step explanation so you understand the method, not just the answer. Use the answer key above to jump to any question, then take the practice test to check yourself under exam-like conditions.
Frequently asked questions
How many MCQs are there in Solutions?
This chapter has 10 book-back multiple-choice questions, each with the correct answer and a step-by-step explanation.
Are these 10th Standard Science MCQs free to practise online?
Yes. Every question, answer and explanation here is free, and you can also take them as a timed practice test.
Where can I find the Solutions book-back answers?
The correct option for each question is highlighted on this page with a worked explanation, plus a quick answer-key summary at the top.
