Question

Chemistry -I. Choose the correct answer from the options given below: 1. Diya was doing some experiments. The steps of procedure are given here. i) took two test tubes, marked them as A and B. ii) Put small pieces of copper wire in both the test tubes. iii) added 4 to 5 drops of dilute hydrochloric acid in test tube A and dilute sulphuric acid in test tube B. iv) Brought a lighted match stick near the mouth of the test tubes She observed that in test tube B, the match stick burnt with a pop sound. Conclusion of this experiment would be ------ a. Copper reacts with hydrochloric acid releasing hydrogen gas b. Copper reacts with sulphuric acid releasing oxygen gas c. Copper reacts with sulphuric acid releasing hydrogen gas d. Copper reacts with hydrochloric acid releasing oxygen gas 2. Megha got a magnesium ribbon from the science lab. She burnt it, took the ash and mixed it in water. Then she tested the solution with a litmus paper. The observation would be ------- a. There was no colour change in the litmus paper b. Blue litmus paper changed red c. Red litmus paper changed blue d. None of the above 3. Sita bought a copper lamp as a decorative piece and displayed it in her show case. After a month she found that it looked dull with green patches on it. She was so shocked to see this. The green material is -------- a. A mixture of copper hydroxide and copper carbonate b. Copper hydroxide c. Copper carbonate d. Copper oxide 4. Which of the following metal reacts with dilute sulphuric acid and release hydrogen? a. Copper b. Silver c. Gold d. Magnesium 5. Which of the following metals does not react with concentrated hydrochloric acid? a. Zinc b. Iron c. Copper d. Potassium II. Answer the following. 1. Zinc sulphate forms colourless solution in water. Will you observe any colour on adding copper turning in it? 2. Which non-metal is used to disinfect water? 3. What would be the products when metals react with alkalis? 4. Name the different types of metal salts. 5. Name two amphoteric oxides. SUB: SOCIAL SCIENCE DATE

Answer 1

Answer: 5) Explain the reason for change in land use pattern of an area. 5) Explain the reason for change in land use pattern of an area.

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Explanation:

5) Explain the reason for change in land use pattern of an area. 5) Explain the reason for change in land use pattern of an area. 5) Explain the reason for change in land use pattern of an area. 5) Explain the reason for change in land use pattern of an area. 5) Explain the reason for change in land use pattern of an area. 5) Explain the reason for change in land use pattern of an area.

Hbg 5) Explain the reason for change in land use pattern of an area.