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प्रश्न
Two chemical substances X and Y combine together to form a product P which contains both X and Y X + Y P
X and Y cannot be broken down into simpler substances by simple chemical reactions. Which of the following statements concerning X, Y and P are correct ?
- P is a compound
- X and Y are compounds
- X and Y are elements
- P has a fixed composition
पर्याय
(i), (ii) and (iii)
(i), (ii) and (iv)
(ii), (iii) and (iv)
(i), (iii) and (iv)
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उत्तर
(i), (iii), and (iv)
Statements (i), (iii), and (iv) are correct. When two elements combine in a chemical reaction to give a product, the product is a compound. Composition of a compound has a fixed ratio and its properties are different from the elements participating in the reaction.
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संबंधित प्रश्न
Changes in which only ______ properties of a substance change are called physical changes.
Match the columns
| column A | coulmn B |
| 1. A change which cannot be easily reversed | a. man-made change |
| 2.A change that repeats itself at regular intervals | b. chemical change |
| 3. A change that is made by humans | c. physical change |
|
4. A change in which the original substance cannot be obtained |
d. periodic change |
| 5. A change where no new substance is formade | e. irreversible change |
| f. slow change |
Classify the following changes as physical or chemical: curdling of milk
Write true or false
Cutting of paper into pieces is a chemical change.
Classify the Following as a Physical Or a Chemical change.
Glowing of an Electric Bulb
Change is the law of nature which occurs in everyday life.
State when a substance [i.e. matter] undergoes a kind of change.
A change in which matter undergoes a change but the total mass of the substance is unaltered is a ______ change.
When a woolen yarn is knitted to get a sweater, the change can be classified as ____________.
Physical Change: Boiling::Chemical Change: ______.
Grinding of wheat grain changes its size. It is a ____________ change.
