Bissoy.com
Doctors Medicines MCQs Q&A

Which of the following is a set of chemical changes? A. Mixing sugar in milk B. Setting milk into the curd C. Making cottage cheese (paneer) from milk D. Making buttermilk from card 

Which of the following is a set of chemical changes? A. Mixing sugar in milk B. Setting milk into the curd C. Making cottage cheese (paneer) from milk D. Making buttermilk from card  Correct Answer B and C

Concept:

Chemical change:

  • During a chemical change, the molecules of the reactants ( original substances) change to form molecules of the products that are substances that undergo chemical transformation to form new substances.
  • It is generally irreversible.
  • For example: burning of fuels like LPG, petrol, etc, curdling of milk, rusting of iron, etc.

Physical change:

  • During a physical change, substances undergo a change in their physical properties, and the formation of no new substance takes place.
  • It is generally reversible.
  • For example: melting of wax, freezing of water, etc.

Explanation:

  • Mixing of sugar change is a physical change because after sugar is dissolved in milk, its properties do not change and do not form a new substance.
  • Setting milk into curd is a chemical change because a new substance i.e, lactic acid is formed. Milk does not remain the same and once the curd is formed, milk cannot be reobtained from it.
  • Making cottage cheese (paneer) from milk is a chemical change. When an enzyme called rennet is added to milk, cottage cheese is made and this enzyme causes a chemical reaction where the milk solids curdle, separating themselves from the liquid portion of milk. Milk does not remain the same and once the curd is formed, milk cannot be reobtained from it.
  • Making buttermilk from curd is a physical change because by making buttermilk from milk, its properties do not change and do not form a new substance.

Therefore, the correct answer is B and C.

Related Questions

In the following question below some statements are given followed by some conclusions. Taking the given statements to be true even if they seem to be at variance from commonly known facts, read all the conclusions and then decide which of the given conclusions logically follows the given statements. Statements: A few bread is butter. Some curd are butter. No curd is cheese. Conclusions: I. Some butter are not cheese. II. Some bread are curd. III. Some bread are cheese. IV. All butter are curd. 
In the question three statements are given, followed by three conclusions, I, II and III. You have to consider the statements to be true even if it seems to be at variance from commonly known facts. You have to decide which of the given conclusions, if any, follows from the given statements. Statement I: Some milk is curd. Statement II: All curds are tofu. Statement III: All buttermilk is curds. Conclusion I: No buttermilk is tofu. Conclusion II: Some milk is buttermilk is a possibility. Conclusion III: No milk is tofu.
There are two boxes. Box I contains one white card and two black cards and Box II contains one white card and a black card. Two persons P and Q play a game. P picks a card randomly from Box I. If P finds the white card, P wins and the game stops. If P finds the black card, Q draws a card randomly from Box II. If Q finds the white card Q wins. The game stops whether Q draws the white card or P draws the white card. Which one of the following is correct?
Six friends Madav, Arjun, Shankar, Sanvi, Ramya and Shruthi went on a vacation to a hill station. They are to be accommodated in a row of nine cottages, each in one cottage. Madav, Sanvi and Shruthi do not want to stay at the end of the row. Shankar and Madav must not have anybody adjacent to their cottages. There shall be only one empty cottage between Madav’s and Shruthi’s. Arjun’s cottage is adjacent to both Ramya’s and Shruthi’s. Sanvi is to be in the cottage next to the cottage at the beginning. Then what is the maximum number of consecutive cottages that are occupied?
In the question, two statements are given, followed by two conclusions, I and II. You have to consider the statements to be true even if it seems to be at variance with commonly known facts. You have to decide which of the given conclusions, if any, follows from the given statements. Statement 1: Some milk is Paneer. Statement 2: All paneer is Curry. Conclusion I: Some curry is milk. Conclusion II: Some paneer is milk.
Which of the following statements are true? 1. Setting of milk into curd is a chemical change. 2. Setting of milk into curd is a physical change
The following steps are involved in a dairy plant to prepare clarified butter/Ghee. A. Milk is pasteurised B. Then milk is set into curd C. Curd is churned in centrifuge to separate butter D. Butter is heated to get clarified butter (Ghee) E. Filtered and packed Which of the following above steps are physical changes and chemical changes?
Total 190 people attended a marriage ceremony in which 122 people ate palak paneer, 93 people ate dosa and 75 people ate biryani, if 37 people ate both biryani and palak paneer, 38 people ate both dosa and biryani, 45 people ate both dosa and palak paneer and 20 people ate all the three dishes. How many persons ate only one dish?
Read the given information and answer the question asked by choosing the most appropriate option. In a group, 17 persons likes Veg Biryani, 27 persons likes Chicken Biryani and 19 persons likes Saahi Paneer. Among them, 6 persons likes both Saahi Paneer and Veg Biryani, 3 persons likes both Chicken Biryani and Veg Biryani, 3 persons likes both Saahi Paneer and Chicken Biryani and 4 persons likes all the three food items. How many persons likes only one food item?
Product X is produced by mixing chemical A and chemical B in the ratio of 5 : 4. Chemical A is prepared by mixing two raw materials, P and Q, in the ratio of 1 : 3. Chemical B is prepared by mixing raw materials, Q and R, in the ratio of 2 : 1. Then the final mixture is prepared by mixing 8640 units of product X with water. If the concentration of the raw material Q in the final mixture is 50%, how much water had been added to product X?