Please select a subject first
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Why are Noble gases inert in nature?
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Zn + 2 HCl → ZnCl2 +_____↑
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Since metal carbonate and metal bicarbonate are basic, they react with acids to give salt and water with the liberation of ______.
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Classify the various types of Acids based on their sources.
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Two acids ‘A’ and ‘B’ are given. Acid A gives one hydrogen ion per molecule of the acid in solution. Acid B gives two hydrogen ions per molecule of the acid in solution.
- Find out acid A and acid B.
- Which acid is called the King of Chemicals?
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Compounds with same molecular formula and different structural formula are known as ______.
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Match the following.
| 1. | Alkyne | Bucky Ball |
| 2. | Andre Geim | Oxidation |
| 3. | C60 | Graphene |
| 4. | Thermocol | Triple bond |
| 5. | Combution | Polystyrene |
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Higher Order Thinking Skill.
Why do carbon exist mostly in combined state?
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One Nanometre is ______.
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The age of a dead animal can be determined by using an isotope of ______.
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The groups responsible for the colour of an organic compound is called ______.
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Match the following.
| Sclereids | Chlorenchyma |
| Chloroplast | Sclerenchyma |
| Simple tissue | Collenchyma |
| Companion cell | Xylem |
| Trachieds | Phloem |
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The human body functions normally at a temperature of about _____
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Match the following.
| Organ | Elimination | |
| Skin | a. | Urine |
| Lungs | b. | Sweat |
| Intestine | c. | Carbon dioxide |
| Kidneys | d. | Undigested food |
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Why do we sweat?
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Assertion: In both the sexes gonads perform dual function.
Reason: Gonads are also called primary sex organs.
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Higher Order Thinking Skill
Why your doctor advises you to drink plenty of water?
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Higher Order Thinking Skill
Can you guess why there are sweat glands on the palm of our hands and the soles of our feet?
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Match the following.
| Column A | Column B | ||
| 1. | Calcium | a. | Muscular fatigue |
| 2. | Sodium | b. | Anaemia |
| 3. | Potassium | c. | Osteoporosis |
| 4. | Iron | d. | Goitre |
| 5. | Iodine | e. | Muscular cramps |
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The slides are grouped together in a sequence to form _______.
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