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Calcium carbonate is decomposed on heating in the following reaction
CaCO3 → CaO + CO2
How many moles of Calcium carbonate is involved in this reaction?
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Calcium carbonate is decomposed on heating in the following reaction
CaCO3 → CaO + CO2
Calculate the gram molecular mass of calcium carbonate involved in this reaction.
Concept: undefined >> undefined
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Calcium carbonate is decomposed on heating in the following reaction
CaCO3 → CaO + CO2
How many moles of CO2 are there in this equation?
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If the electronegativity difference between two bonded atoms in a molecule is greater than 1.7, the nature of bonding is ______
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Answer the following question using the data given below:
- Assertion: The nature of bond in HF molecule is ionic
- Reason: The electronegativity difference between H and F is 1.9.
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Volume percentage decreases with increases in temperature because ______
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3.5 litres of ethanol is present in 15 litres of an aqueous solution of ethanol. Calculate volume percent of ethanol solution.
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A solution is prepared by dissolving 45 g of sugar in 180 g of water. Calculate the mass percentage of solute.
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A single displacement reaction is represented by X(s) + 2HCl(aq) → XCl2(aq) + H2(g). Which of the following(s) could be X.
(i) Zn
(ii) Ag
(iii) Cu
(iv) Mg.
Choose the best pair.
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Match the following
Identify the types of reactions.
| REACTION | TYPE |
| NH4OH(aq) + CH3COOH(aq) → CH3COONH4(aq) + H2O(l) | Single Displacement |
| Zn(s) + CuSO4(aq) → ZnSO4(aq) + Cu(s) | Combustion |
| \[\ce{ZnCO3_{(s)} + ->[Heat]ZnO_{(s)} + CO2_{(g)}}\] | Neutralization |
| C2H4(g) + 4O2(g) → 2CO2(g) + 2H2 O(g) + Heat | Thermal decomposition |
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Which organ acts as a suction pump in leech?
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List out the parasitic adaptations in the leech.
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Assertion & Reasoning
- Assertion: The sum of the clockwise moments is equal to the sum of the anticlockwise moments.
- Reason: The principle of conservation of momentum is valid if the external force on the system is zero.
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For a given heat in liquid, the apparent expansion is more than that of real expansion.
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Explain the experiment of measuring the real and apparent expansion of a liquid with a neat diagram.
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With the help of a circuit diagram derive the formula for the resultant resistance of three resistances connected:
- in series and
- in parallel
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What is the minimum distance needed for an echo?
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A man is standing between two vertical walls 680 m apart. He claps his hands and hears two distinct echoes after 0.9 seconds and 1.1 seconds respectively. What is the speed of sound in the air?
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