3. Answer any 1 of the following. Each question contains 4 marks.
a. Why dry HCl do not show acidic nature?
b. How do acid react with following:
i. Base
ii. Metallic Carbonates
iii. Metals
iv. Metallic Oxides
4. Answer any 2 of the following. Each question contains 5 marks.
a. Explain the oxidation and reduction reaction giving examples.
b. Why do wall do not acquire white colour after white wash im
Give few methods to prevent rusting.
C.
SECTION -C (BIOLOGY
a.
1. Multiple choice questions. Each question contains 1 marks.
Green plants get nutrition by which mode?
i. Hetrotropic
ii. Autotropic
iii. Seprophytic
iv. Parasitic
b. The cell surrounding the stomatal pore are called
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Answer:
a. dry HCL do not reacts with anything ,because for reaction atoms *(electrons) should be in free state(loosely packed) ...hence, liquid state.So that is why Dry HCL do not reacts.
B. 1.acid+base----salt+water *(NEUTRALISATION REACTION)
2.acid+metallic oxides carbonates----salt+Co2+H2O
3.acid+metal-----salt+water
4.same as with metallic hydrocarbons
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