Question

ताराबाई व शाहू महाराज यांची युद्ध कुठे zale​

Answer 1

Answer:

Which of the following salt is present in tooth enamel ? (a) Calcium phosphate (b) Barium phosphate (c) Magnesium phosphate(d) Sodium phosphate. 12. Which of the following will not turn blue litmus red? (a) Dilute acetic acid (b) Aqueous solution of ammonium chloride (c) Aqueous solution of sodium carbonate (d) Conc, sulphuric acid. 13. When a small piece of zinc metal is added to the test tube containing dilute hydrochloric acid, what is not observed ? (a) A colourless gas is evolved (b) The gas evolved has pungent smell (c) Zinc slowly disappears (d) Zinc chloride is formed as one of the products. A-35 14. A pH paper is dipped in a solution of oxalic acid Which of the following colour is observed 7 (c) Orange by leighe yellow Dark brown 15. An aqueous solution of some salt turres red litmus Mo In order to reverse the colour change, which of the following reagent should be added in excess? () Dilute sulphuric acid (b) Aqueous solution of ammonium chloride ( Aqueous solution of washing soda (d) Aqueous solution of sodium acetate 16. Which ingredients are present in soda-acid type fire extinguisher 7 (a) Liquid carbon dioxide(b) NaHCO, and H₂50, () Na CO₂ and HCI (d) CaCO, and HS0 17. The compound, CaSO, 21-O is called: (b) Epsom salt (a) Plaster of Paris (c) White vitriol (d) Gypsum 18. Which of the following changes its colour from blue to white on heating in a test tube? (a) BaCl₂-2H₂O (c) CuSO4-5H₂O (d) Cu(NO₂)2 19. What is the formula of bleaching powder ? (d) CaCl₂ (c) CaCl₂ by CHCO (d) Ca(OCT)₂ 20. Which of the following species is called soda ash ? (a) Na₂CO3 (c) Na₂CO 10H₂O (b) Na₂CO3 H₂O 21. What is the meaning of pH ? (a) It is negative logarithm of H ion concentration of the solution (b) It represents the number of H atoms present in the solution (c) It represents the oxidising strength of solution (d) It represents the tendency of reduction. 22. Normal pH range of living organism is: (a) 8 to 9 (c) 6-0 to 7:0 (b) 7-0 to 7-8 (d) 11-0 to 12-0 23. pH of tomato juice is approximately: (a) 8-0 (70 (d) 20. 24. pH of saliva before and after the meals respectively is (c) 4-0 approximately: (a) 5-8,7-3 (c) 8,9 (b) 6,7 (d) 7-3,5-8.A man's profession is often other man's : (A) Play (B) Recreation (C) Both (A) and (B) (D) None of these