Question

SECTION C (Short Answer) 5 x 3= 15 marks
1. List the uses of the following a) Hydrochloroic acid b) Sulphuric acid
2. What is rusting of iron? Give the word formula and molecular formula of rust
3. Describe the characteristics of loamy soil in brief.
4. Give three ways in which a polar bear adapts itself to extreme cold conditions.​

Answer 1

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1. HCl is used to clean the tile of the floor andThe major use of sulfuric acid is in the production of fertilizers
2. Rusting of iron refers to the formation of rust, a mixture of iron oxides, on the surface of iron objects or structures. This rust is formed from a redox reaction between oxygen and iron in an environment containing water (such as air containing high levels of moisture). The rusting of iron is characterized by the formation of a layer of a red, flaky substance that easily crumbles into a powder. Fe(OH)2 ⇌ FeO + H2O

4Fe(OH)2 + O2 + xH2O → 2Fe2O3.(x+4)H2O

Fe(OH)3 ⇌ FeO(OH) + H2O

FeO(OH) ⇌ Fe2O3 + H2O. 4.Loam soils generally contain more nutrients, moisture, and humus than sandy soils, have better drainage and infiltration of water and air than siltand clay-rich soils, and are easier to till than clay soils. 5.Animals like polar bears in the polar regions may have the following adaptive features:

Low surface area to volume ratio.

Small extremities to reduce heat loss - shorter ears and limbs.

A thick layer of body fat/blubber - present in seals to reduce body heat loss.

Thick camouflaged fur.

Thick fur on paws.