ये 37 सवाल आपको CBSE Board में करवा सकता है टॉप, जिनको लग रहा फेल होने का डर वो जरूर पढ़ें

CBSE Board की परीक्षा जैसे-जैसे नजदीक आ रही है, वैसे-वैसे ही सभी अभ्यार्थियों के दिलों की धड़कने भी तेज हो रही होगी। सभी लोग अपनी तैयारियों में जुटे हुए हैं। कुछ लोगों को ये समझ नहीं आ रहा होगा कि कैसे तैयारी की जाए और कहां से पढ़ा जाए। आज हम आपको बताएंगे की कैसे की जाए तैयारी जिससे टॉप के नंबर मिल सकें और किस तरह के सवाल पर ध्यान दिया जाए जो आपको टॉप करने में मदद करेगा।
1. Name two constituents of baking power.
2. What is universal indicator?
3. Name the chemicals that can be made of common salt
4. Why does cake become fluffy after adding baking soda?
5. Write the pH value, after which teeth start decaying?
6. State some uses of baking soda?
7. How is the concentration of hydroxide ions (OH-) affected when excess base is dissolved in a solution of sodium hydroxide?
8. Name the gas evolved when dilute sulphuric acid acts on sodium carbonate.Write the chemical equation for the reaction involved.
9. What are the properties and uses of bleaching powder?
10. Write a chemical formula to represent the action of atmospheric CO2 gas on bleaching powder when left exposed in open.
11. What happens when quick lime is added to water?
12. Write any two properties of acids.
13. Give the electron dot structure of CO2.
14. What is hydrogenation? What is its industrial application?
15. What is funcational group? Identify the functional group present in CH3COOH and C2H5OH.(3 Marks)
16. Explain the mechanism of cleaning action of soaps.
17. (a) What are hydrocarbons? (b) Give difference between saturated and unsaturated hydrocarbons. (c) Why does carbon form large number of compounds?
18. Explain the process of corrosion and rusting.
19.How is exothermic reaction different from an endothermic reaction?
20.Explain four different types of chemical reaction with suitable examples.
21. How do we balance a chemical equation?
22. Why are oil and fat containing food items flushed with nitrogen?
23. What is the difference between displacement and double displacement reaction? Give suitable chemical equations for the same.
24. Give two uses of quick lime.
25.What is electrolytic decomposition?
26. Identify the following type of reactions:-
▪ Na2SO4 + BaCL2 = BaSO4 + 2NaCL ▪ CaCO3 = CaO + CO2 ▪ Fe + CuSO4 = FeSO4 + Cu
27. Why do non-metals not conductelectricity? Also, name one non-metal that conducts electricity.
28. Write balanced chemical equations for the following: a. Dilute sulphuric acid reacts with aluminium powder. b. Dilute hydrochloric acid reacts with sodium carbonate. c.Carbon dioxide is passed through lime water.
29. Give the steps involved in the extraction of metals of low and medium reactivity fromtheir respective sulphide ores.
30 Define atomic size?
31. Name two isotopes of carbon.
32. Name any two alkali present in group1.
33. An element X belongs to II group and 2nd period. Write the atomic number and name of element.
34. The atomic number of X is 17, predict its
a. Valency b. Formula of its halide c. Type of ion formed d. Reactivity with respect to the other of same group
35. What happens to the valence electrons and valency as we move to left to right in a period and top to bottom in a period?
36. Name the following elements
a. Two shells both of which are completely filled b. Three shells with 2 valence electrons c. Metals with valency 3, group number 13 and period 3.
37 An element X from group 1 combines with an element Y from group 17 to form a compound. Both X and Y belongs to period II.
a. Give the formula of the compound formed b. Will the compound be ionic or covalent c. Give its electrons dot structure.