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प्रश्न
Give a reason why rust turns moist red litmus blue.
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उत्तर
A suspension of rust is basic in nature and hence turn moist red litmus blue.
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संबंधित प्रश्न
Give two examples of alloys with their chemical composition.
The chemical reaction involved in the corrosion of iron metal is that of:
(a) oxidation as well as displacement
(b) reduction as well as combination
(c) oxidation as well as combination
(d) reduction as well as displacement
What are the constituents of stainless steel?
State under what conditions corrosion is faster ?
State whether the statement given below is true or false. If false write the correct statement.
Either oxygen or moisture is essential for rusting.
Write a short note on Alloying.
Find the odd one out and give its explanation.
Observe the following diagram and write answers.
- Name the method.
- Explain the method.
- Give two examples of this method.
The table shown below gives information about four substances: A, B, C and D.
| SUBSTANCE | MELTING POINT (K) | ELECTRICAL CONDUCTIVITY | |
| SOLID | LIQUID/ AQUEOUS | ||
| A | 295 | Good | Good |
| B | 1210 | Poor | Good |
| C | 1890 | Poor | Good |
| D | 1160 | Poor | Poor |
Identify Ionic compounds from the above given substances.
Generally, when metals are treated with mineral acids, hydrogen gas is liberated but when metals (except Mn and Mg), treated with HNO3, hydrogen is not liberated, why?
