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In order to refine "copper" it is melted...

In order to refine "copper" it is melted in a furnace and it is stirred with green logs of wood. The purpose is :-

A

to expel the dissolved gases in blister copper

B

to reduce the metallic oxide impurities with hydrocarbon gases liberated from the wood

C

to bring the impurities to surface and oxidise them

D

to increase the carbon content in copper

Text Solution

Verified by Experts

The correct Answer is:
B
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Blister copper is refined by stirring molte impure metal with green logs of wood because such a wood liberates hydrogen gases (like CH_(4)) . This process X is called…..and the metal contains impurities of Y is…

Blister copper is refined by stirring molten impure metal with green logs of wood because such a wood liberates hydrocarbon gases (like CH_4 ). This process X is called ________ and the metal contains impurities of Y is __________ .

Knowledge Check

  • In order to refine blister copper it is melted in a furnace and is stirred with green logs of wood. The purpose is

    A
    to increase the carbon content of copper.
    B
    to bring the impurities to surface and oxidize them.
    C
    to reduce the metallic oxide impurities with hydrocarbon gasses liberated from the wood.
    D
    to expel the dissolved gases in blister copper.

  • In order to refine "blister copper' it is melted in a furnace and is stirred with green logs of wood. The purpose is _______

    A
    to expel the dissolved gases in blister copper
    B
    to bring the impurities to surface and oxidize them
    C
    to inrease the carbon content of copper
    D
    to reduce the metallic oxide impurities with hydrocarbon gases liberated from the wood

  • In order to refine blister copper , it melts in a furnance and is stirred with green logs of wood . The purpose is

    A
    to expel the dissoved gases in blister copper
    B
    to bring the impurities to surface and oxidise them
    C
    to increase the carbon content of copper
    D
    to reduce the metallic oxide impurities with hydrocarbon gases liberated from the wood

    • Similar Questions

    Explore conceptually related problems

    Blister copper is refined by striring molten impure metal with green logs of wood because such a wood liberates hydrocarbon gases (like CH_(4)) . This process X is called ____ and the metal contain impurities of Y is _____.

    Mark the correct statements. (i) Mercury can be refined by the process of distillation. (ii) In poling, the molten impure metal is stirred with green poles of wood. (iii) In electrolytic refining of metals , impure metal is made as cathode and a thin strip of pure metal is made as anode.

    Blister copper is refined by stirring moltem impure metal with green logs of wood because such a wood liberated hydrocarbon gases like (CH_(4)) . The process X is called _____ and the Metal contains impurity of Y is ____:

    Read the following passage and answer the questions given after it. The stark observation made in the Economic Survey of 2015-16 that “Indian agriculture, is in a way, a victim of its own past success – especially the green revolution”, shows the dark reality of the agriculture sector at present and the havoc that has been wreaked by the green revolution. The green revolution, which is often characterised by the introduction of high-yielding variety of seeds and fertilisers, undoubtedly increased the productivity of land considerably. But the growth in the productivity has been stagnant in recent years, resulting in a significant decline in the income of farmers. There have also been negative environmental effects in the form of depleting water table, emission of greenhouse gases, and the contamination of surface and ground water. Needless to say, the agriculture sector is in a state of distress, which is severely affecting peasants and marginal farmers, and urgent policy interventions are required to protect their interests. The government has responded to the problem by constituting a panel, which will recommend ways to double the income of farmers by 2022. While this may be an overtly ambitious target, if we want to boost stagnated agricultural growth a shift has to be made from food security of the nation to income security of the farmers. However, there are many hurdles that have to be crossed if we want to achieve this objective. The first major barrier to overcome is declining productivity. Data from 2013 reveals that India’s average yield of cereal per hectare is far less than that of many countries (including several low income countries), but the difference is huge when compared to China. For instance, our average yield per hectare is 39% below than that of China and for rice this figure is 46%. Even Bangladesh, Vietnam and Indonesia fare better than India in case of rice yield. Further, there is a huge inter-regional variation, the wheat and rice yield from Haryana and Punjab is much higher than from the other states. In order to cross the declining productivity barrier there is a need to herald a rainbow revolution by making a shift from wheat-rice cycle to other cereals and pulses. Since wheat and rice coupled with other crops are backed by minimum support prices (MSP) and input subsidy (whether water, fertiliser or power) regime, there is a huge incentive for the farmers in the irrigated region of Northwest India to grow these crops. The purpose of this passage is to:

    The stark observation made in the Economic Survey of 2015-16 that “Indian agriculture, is in a way, a victim of its own past success - especially the green revolution", shows the dark reality of the agriculture sector at present and the havoc that has been wreaked by the green revolution. The green revolution, which is often characterised by the introduction of high-yielding variety of seeds and fertilisers, undoubtedly increased the productivity of land considerably. But the growth in the productivity has been stagnant in recent years, resulting in a significant decline in the income of farmers. There have also been negative environmental effects in the form of depleting water table, emission of greenhouse gases, and the contamination of surface and ground water. Needless to say, the agriculture sector is in a state of distress, which is severely affecting peasants and marginal farmers, and urgent policy interventions are required to protect their interests.The government has responded to the problem by constituting a panel, which will recommend ways to double the income of farmers by 2022. While this may be an overtly ambitious target, if we want to boost stagnated agricultural growth a shift has to be made from food security of the nation to income security of the farmers. However, there are many hurdles that have to be crossed if we want to achieve this objective. The first major barrier to overcome is declining productivity. Data from 2013 reveals that India.s average yield of cereal per hectare is far less than that of many countries (including several low income countries), but the difference is huge when compared to China. For instance, our average yield per hectare is 39% below than that of China and for rice this figure is 46%. Even Bangladesh, Vietnam and Indonesia fare better than India in case of rice yield. Further, there is a huge inter-regional variation, the wheat and rice yield from Haryana and Punjabis much higher than from the other states. In order to cross the declining productivity barrier there is a need to herald a rainbow revolution by making a shift from wheat-rice cycle to other cereals and pulses. Since wheat and rice coupled with other crops are backed by minimum support prices (MSP) and input subsidy (whether water, fertiliser or power) regime, there is a huge incentive for the farmers in the irrigated region of Northwest India to grow these crops. The purpose of this passage is to

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