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प्रश्न
Aluminium powder is used in thermite welding because
पर्याय
It is a strong reducing agent
It is a strong oxidizing agent
It is corrosion resistant
It is a good conductor of heat
उत्तर
It is a strong reducing agent
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संबंधित प्रश्न
State the main components of the following alloys:
Bronze
Explain with reason:
Electrolytic reduction is done to obtain aluminium?
State the use of:
Mild steel,
Name an alloy of zinc which is used in simple voltaic cells.
From the metals copper, iron, magnesium, sodium and zinc, select a different metal in each case which:
(a) Does not react with dilute hydrochloric acid
(b) Can form 2+ and 3+ ions
(c) Has a hydroxide that reacts with both acid and alkalis.
(d) Does not react with cold water, but reacts with steam when heated.
A to F below relate to the source and extraction of either zinc or aluminium.
- Bauxite
- Coke
- Cryolite
- Froth floatation
- Sodium hydroxide solution
- Zinc blende
Write down the three letters each from the above list which are relevant to:
- Zinc
- Aluminium
A to F below relate to the source and extraction of either zinc or aluminium.
- Bauxite
- Coke
- Cryolite
- Froth floatation
- Sodium hydroxide solution
- Zinc blende
Write the formula of cryolite.
Name the following :
An alloy of lead and tin that is use in electrical circuits.
Bauxite : Aluminium ore : : Cassiterite : _______
Draw diagram of magnetic separation process and answer the questions based on it.
- Give example in which this process can work.
- Suggest any two methods that can also be used for this purpose.
- Which technique is based on hydrophobic and hydrophilic properties of particles?
