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Why should a magnesium ribbon be cleaned before burning in air?

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Ques 1. Development of a country can generally be determined by (i)  its per capita income (ii) its average literacy level (iii)  Health status of its people (iv)  all of the above Answer : (iv) all of the above   ( UNDP publishes the human development report(HDR) comparing the countries on the basis of educational level of the people, their health status and per capita income.  Ques 2. Which of the following neighbouring countries has better performance in terms of the human development than India?  (i) Bangladesh (ii) Sri Lanka (iii) Nepal (iv) Pakistan Answer : (ii) Sri Lanka ,  HDI(human development index) of Sri Lanka is 73 which is much higher than the Bangladesh, Nepal and  Pakistan which have 139,145 and 147 respectively.  Ques 3. Assume there are four families in a country. The average per capita income of these families is Rs 5000. If the income of three families are Rs 4000, Rs 7000 and Rs 3000 respecti...
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