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प्रश्न
Mercury, silver, gold are highly reactive metals.
विकल्प
Right
Wrong
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उत्तर
Mercury, silver, gold are highly reactive metals- Wrong
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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?
What is the difference between a mineral and an ore?
How is aluminium metal extracted? Explain with the help of an equation.
The metal which can be extracted from the bauxite ore is:
(a) Na
(b) Mn
(c) Al
(d) Hg
Which of the following metals can be obtained from haematite ore?
(a) copper
(b) sodium
(c) zinc
(d) iron
In an electrolytic tank, aluminium metal is being extracted by the electrolysis of molten aluminium oxide using carbon electrodes. It is observed that one of the carbon electrodes is gradually burnt away and has to be replaced.
(a) Which carbon electrode (cathode or anode) is burnt away?
(b) Why is this carbon electrode burnt away?
A black metal oxide XO2 is used as a catalyst in the preparation of oxygen gas from potassium chlorate. The oxide XO2 is also used in ordinary dry cells. The metal oxide XO2 cannot be reduced satisfactorily with carbon to form metal X.
(a) Name the metal X.
(b) Name the metal oxide XO2.
(c) Which reducing agent can be used to reduce XO2 to obtain metal X?
(d) Name another metal which can also be extracted by the reduction of its oxide with the above reducing agent.
Aluminum is used in thermite welding:
what is ignition mixture?
An element has its electron configuration as 2,8,8,2. Now answer the following questions.
a) What is the atomic number of this element?
b) What is the group of this element?
c) To which period does this element belong?
The following question relate to the extraction of aluminium by electrolysis.
Give the equation for the reaction which takes place at the cathode.
Complete the incomplete statement with missing words:
Metals are ______ while non-metals are ______ conductors of heat.
Froth floatation process is generally used to concentrate ______ ores.
Extraction of moderately reactive elements is done by _______ and _______ method.
Identify who I am!
Ore of Aluminum- ______
Explain the following reaction with the balanced equation.
Ferric oxide is reacted with aluminium.
Explain the following reaction with the balanced equation.
Zinc oxide is treated with carbon
Explain in brief electrolytic reduction of alumina with a neat labelled diagram.
The highly reactive metals like Sodium, Potassium, Magnesium, etc. are extracted by the ____________.
Which of the following metals exist in their native state in nature?
(i) Cu
(ii) Au
(iii) Zn
(iv) Ag
