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Answer 1

Answer:

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1. Dilute sulphuric acid is added to granulated zinc?

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When Zinc reacts with dilute sulphuric acid, hydrogen gas is evolved with an effervesence. Zn + dil. H2SO4 → Zn SO4 + H2.

2. Solid lead nitrate is heated?

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It decomposes to produce light yellow solid lead monoxide, reddish-brown nitrogen dioxide gas and colourless oxygen gas.

3. The mixture of kerosene oil and water is placed in a separating funnel?

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When the mixture of water and kerosene is put in a separating funnel, it forms two layers. Water, being heavier, forms the lower layer in the separating funnel whereas kerosene, being lighter, forms the upper layer.

4. Phenolphthalein is added to sodium hydroxide solution?

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When the sodium hydroxide, which is a base, is mixed with phenolphthalein, it turns pink. ... This happens because the base is neutralized in an acid solution, which causes the indicator to become colorless.

5. Magnesium ribbon is burnt is oxygen?

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White powder magnesium oxide (MgO)

White powder magnesium oxide (MgO)When magnesium ribbon is burnt in the air, it combines with oxygen to form white powder magnesium oxide MgO with the release of heat and light. It forms a white powder of magnesium oxide.

6. Iron nail is kept in copper sulphate solution for sometime?

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When an iron nail is kept in copper sulphate solution, a reddish brown coating is seen on the iron nail after sometime. Also, the colour of the copper sulphate solution changes from blue to green. This is observed because iron displaces copper from copper sulphate solution as iron is more reactive than copper.

7. Limestone is heated?

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When heated, limestone (known chemically as calcium carbonate) is converted into two new substances, lime (calcium oxide) and carbon dioxide, that have very different properties from those of limestone.

8. Hydrogen peroxide is exposing to sunlight?

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Hydrogen peroxide decomposes when exposed to sunlight to give water and Oxygen. ... When exposed to sunlight it readily decomposes by the UV rays to water and Oxygen.

9. Barium chloride is added to sodium sulphate solution?

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For example, on mixing a solution of barium chloride with sodium sulphate, a white precipitate of barium sulphate is immediately formed. ... The reactants changes into ions when dissolved in water and there is an exchange of ions in solution. This results in the formation of product molecule.

10. H2s Gas is passed through copper sulphate solution?

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When hydrogen sulphide gas is passed through a blue solution of copper sulphate, a black precipitate of copper sulphide is obtained and the sulphuric acid so formed remains in the solution.

Hope it will help uhh