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Noble gases being monoatomic have no inter atomic forces except weak dispersion forces and therefore, they are liquefied at very low temperatures. Hence, they have low boiling points.
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Growth of Population: It is the change in the number of people in a particular area at a particular time. It is expressed in percentage. The annual growth rate of India's population in 2001 was 2.4%.
Phases of growth rate of population caused by annual birth rate and death rate:
PHASE I [1901-1921]:
- Period of stagnant growth.
- Negative growth was recorded during 1911 to 1921.
- Birth rate and death rate were high which kept the rate of increase low.
- Poor health and medical facilities, illiteracy, inefficiency in distribution of food and war were responsible for high death rate in the period.
PHASE-II [1921-1951]:
- Period of steady population growth.
- Improved health and sanitation facilities.
- Better transport and communication means Improved distribution system.
- Birth rate remained high, leading to high growth rate.
PHASE-III [1951-1981]:
- Period of population explosion.
- Rapid fall in death rate but high birth rate.
- Growth rate was high at 2.2%.
- Improved medical facilities improved living standard and the growth in economy helped in population explosion.
- Immigration from neighbouring countries.
PHASE-IV [1981-2001]:
- Growth rate declined due to crude decline in birth rate.
- Increase in the mean age of marriage.
- Improved literacy, specially among females.
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(i) The size of the economy grows over time as a result of increasing population, change in income levels, available technology and associated factors. As a result, the pressure on land will increase with time and marginal lands would come under use.
(ii) Secondly, the composition of the economy would undergo a change over time. In other words, the secondary and the tertiary sectors usually grow much faster than the primary sector, specifically the agricultural sector. This type of
change is common in developing countries like India. This process would result in a gradual shift of land from agricultural uses to non-agricultural
uses.
(iii) Thirdly, though the contribution of the agricultural activities reduces over time,the pressure on land for agricultural activities does not decline. The reasons for continued pressure on agricultural land are:
(a) In developing countries, the share of population dependent on agriculture usually declines much more slowly compared to
the decline in the sector’s share in GDP.
(b) The number of people that the agricultural sector has to feed is increasing day by day.
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The thermal stability of hydrides decreases on moving down the group. This is due to a decrease in the bond dissociation enthalpy (H-E) of hydrides on moving down the group. Therefore,

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You can check last year papers here : https://mycbseguide.com/cbse-question-papers.html
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The 38 elements in groups 3 through 12 of the periodic table are called transition metals.
The Transition Metals are:
- Scandium.
- Titanium.
- Vanadium.
- Chromium.
- Manganese.
- Iron.
- Cobalt.
- Nickel.
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Consumer's Cooperative Societies: It is formed by consumers for obtaining good quality products at reasonable prices. The society aims to achieve economy in operations by purchasing goods in bulk directly from the wholesalers and selling them directly to the members, thereby eliminating the middlemen.
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In some European countries, females recorded favourable *** ratio because women enjoy the better socio-economic status and biologically more females are born than males and some social evils like female infanticide are not common in European countries.
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Puru Shekhawat 6 years, 3 months ago
2Thank You