Question

solve the paper please

1)Element X forms XCl2 with Chlorine the element X belongs to the group in which------ is present

a)Barium
b)Silicon
c)Iodine

2)2Mg + O2 -----> 2MgO This reaction is an example of

a)Reduction
b)Oxidation
c)Redox

3)CO2 released in a reaction is tested with

a)Ca(OH)2
b)CaO
c)CaCO3

4)When Calcium Carbonate decomposes, the reaction is:

a)Exothermic
b)Endothermic
c)Combination

5)Hydrogen Peroxide decomposes fast in the presence of:

a)KClO3
b)KCl
c)MnO2

6)Sugar on heating decomposes as:

a)12C + 11H2O
b)11C +12H2O
c)11C + 11H2O

7)If angle i is the critical angle, using snells law, sin r is equal to

a)1
b)0
c)0.5

(spams= your 15 answers will be reported)​

Answer 1

Explanation:

1. silicon
2. oxidation
3. Ca(OH)2
4. endothermic
5. KClO3
6. 12C+11H2O
7. 1 (think so )

Hope this answer is helpful.......

Answer 2

Answer:

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