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प्रश्न
Aluminium oxide is _______ oxide.
विकल्प
acidic
basic
neutral
amphoteric
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उत्तर
Aluminium oxide is amphoteric oxide.
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संबंधित प्रश्न
A man went door to door posing as a goldsmith. He promised to bring back the glitter of old and dull gold ornaments. An unsuspecting lady gave a set of gold bangles to him which he dipped in a particular solution. The bangles sparkled like new but their weight was reduced drastically. The lady was upset, but after a futile argument, the man beat a hasty retreat. Can you play the detective to find out the nature of the solution he had used?
Why does a new aluminium vessel lose shine so soon after use?
Name one metal which is extracted by:
Electrolytic reduction.
Bronze is an alloy of copper and ______.
The non-metal present in steel is ______.
Why does aluminium not corrode right through?
Define the term mineral.
What is the difference between a mineral and an ore?
Name the metal which is extracted from the ore called ‘rock salt’.
Metals X and Y can be recovered from the anode mud left behind after the electrolytic refining of copper metal. The coins made of metal X look new even after several years of use but the coins made of metal Y lose their shine gradually and get blackened soon. When metal X is alloyed with a small amount of metal Y, it becomes hard and hence suitable for making ornaments. What are metals X and Y? Also state the colour of metal X.
Give reasons, why aluminum is used in:
In aluminiothermy
Name the following:
Two metals which are found in the free or native state.
What is meant by refining of metals?
Write equations for each of the above metal which reacts with water.
Name:
The allotrope of the non-metal carbon which conducts electricity.
Complete the following by selecting the correct option from the choices given:
The metal which does not react with water or dilute H2SO4 but reacts with concentrated H2SO4 is _________
Usually ______ ores are subjected to ______ which is done in the absence of air.
Explain concept with example/explain with the help of a balanced equation.
Roasting
Explain concept with example/explain with the help of a balanced equation.
Calcination
The highly reactive metals like Sodium, Potassium, Magnesium, etc. are extracted by the ____________.
