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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
Why do gold ornaments look new even after several years of use?
Name two metals which are found in nature mainly in the free state (as metallic elements).
What is the difference between a mineral and an ore?
Name one ore of aluminium. Name the aluminium compound present in this ore and write its chemical formula.
How is copper extracted from its sulphide ore (copper glance), Cu2S? Explain with equations of the reactions involved.
The metal which can be extracted simply by heating the cinnabar ore in air is ______.
Zinc blende ore can be converted into zinc oxide by the process of ______.
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.
- Name the metal X.
- Name the metal oxide XO2.
- Which reducing agent can be used to reduce XO2 to obtain metal X?
- 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 thermit?
Name the following:
Two metals which are found in the free or native state.
Name the following:
The substance added to get rid of gangue in the extraction of metal.
What is galvanized iron.
Write equations for each of the above metal which reacts with water.
Complete the incomplete statement with missing word:
Metals are malleable while non-metals are ______.
Which one of the following is not true of metal :
Metals form non-polar covalent compounds
Name the following:
A steel grey coloured solid non-metal.
Gold and silver are active metals.
Explain concept with example/explain with the help of a balanced equation.
Roasting
2 mL each of concentrated HCl, HNO3 and a mixture of concentrated HCl and concentrated HNO3 in the ratio of 3 : 1 were taken in test tubes labelled as A, B and C. A small piece of metal was put in each test tube. No change occurred in test tubes A and B but the metal got dissolved in test tube C respectively. The metal could be
Two ores A and B were taken. On heating ore A gives CO2 whereas, ore B gives SO2. What steps will you take to convert them into metals?
