CBSE Guess > Papers > Important Questions > Class X > 2010 > Science > Science By Anup Sharma CBSE CLASS X Q. 1. Write the chemical formula of marble. Q. 2. Why silver chloride (AgCl) turns grey in sunlight? Q. 3. Differenciate between displacement and double displacement reactions. Q. 4. State Modern periodic law. Q. 5. Why atomic size decreases on moving from left to right along a period? Q. 6. What is meant by reactivity series of metals? Will the following reaction take place? 3MnO2 (s) +4Al ----> 3Mn(l) +Al2O3(s) + heat Q. 7. What is used as anode and cathode in electrolytic refining of metals? Q. 8. .What is the relation between butane and 2-methyl propane? Q. 9. Explain esterification reaction with example. How is Saponification related to it? Q. 10. What is denatured alcohol?What causes blindness if it is consumed? Q. 11. Write one use of ethanol and methanol each. Q. 12. Write homologous series of alkene up to 5 carbon compound. Q. 13. What is catenation?
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