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प्रश्न
Find the odd one out and give its explanation.
पर्याय
Na
K
Cu
Li
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उत्तर
Cu
Explanation-
Copper (Cu) is a less reactive metal while others are highly reactive metals.
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संबंधित प्रश्न
A zinc ore gave CO2 on treatment with a dilute acid. Identify the ore and write its chemical formula.
Name one metal which is extracted by reduction with carbon.
Name one metal which is extracted by reduction with heat alone.
What is meant by the 'concentration of ore'?
How is aluminium metal extracted? Explain with the help of an equation.
Which of the following is an iron ore?
(a) cinnabar
(b) calamine
(c) haematite
(d) rock salt
The metal which can be extracted from the bauxite ore is:
(a) Na
(b) Mn
(c) Al
(d) Hg
Rock salt is an ore of one of the following metals. This metal is:
(a) Mn
(b) Na
(c) Fe
(d) Cu
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.
State three objectives achieved during the roasting of ores.
State why aluminium is extracted from its oxide by electrolysis while copper, lead, iron by reducing agents and mercury and silver by thermal decomposition.
Give reasons, why aluminum is used in:
making alloys
Complete the incomplete statement with missing word:
Metals form positive ions while non- metals ______.
Name : The metal which is liquid at room temperature.
State three objectives achieved during the roasting of ores.
Name the following :
The Process of heating an ore to a high temperature in the presence of air.
In electrolytic reduction of alumina _______ is used as a cathode.
Explain the following reaction with the balanced equation.
Zinc oxide is treated with carbon
Complete flow chart given below.
Oxides of moderately reactive metals like Zinc, Iron, Nickel, Tin, Copper, etc. are reduced by using:
