Advertisements
Advertisements
प्रश्न
Multiple choice:
A reaction of a type: AB + CD → AD + CD, involves
विकल्प
No chemical change
Decomposition of AB and CD
Exchange of ions of AB and CD
Combination of AB and CD
Advertisements
उत्तर
Exchange of ions of AB and CD
APPEARS IN
संबंधित प्रश्न
The gas we use in the kitchen is called liquefied petroleum gas (LPG). In the cylinder, it exists as a liquid. When it comes out from the cylinder it becomes a gas (Change − A), then it burns (Change − B). The following statements pertain to these changes. Choose the correct one.
What are (i) positive catalysts and (ii) negative catalysts? Support your answer with one example for each of them.
Complete and balance the following chemical equations
Na + H2 O →
What are oxides ?
Name: Two nitrates that do not produce nitrogen dioxide on heating.
A chemical reaction is often accompanied by external indications or characteristics which include –
- Colour change
- Effervescence or gas evolved
- Evolution or absorption of heat
- Formation of a precipitate.
With reference to each of the above indications, state the external indication seen during – Addition of dilute hydrochloric acid to silver nitrate.
What happens when cane sugar is strongly heated? Mention any two changes in it.
A reaction between an acid and a base is called ______.
Which of the following is/are true when milk changes into curd?
- Its state is changed from liquid to semi solid.
- It changes colour.
- It changes taste.
- The change cannot be reversed.
Choose the correct option from below:
Collect information about the types of fuels used for cooking in your area. Discuss with your teachers/parents/others which fuels are less polluting and why.
