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⁞ Chemistry

General Science ➤ Chemistry ➤ 1
Question 6
Q6.  Which of the following react to produce Urea ?
 

Answer :  Carbon dioxide + Ammonia


For use in industry, Urea is produced from synthetic ammonia and carbon dioxide. The process consists of two main equilibrium reactions :

(i) the fast exothermic reaction of liquid ammonia with gaseous carbon dioxide to form ammonium carbamate, and

(ii) urea conversion : the slower endothermic decomposition of ammonium carbamate into urea and water.
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Question 7
Q7.  Essential oils contain
 

Answer :  Terpenoids


An Essential oil is a concentrated hydrophobic liquid containing volatile aroma compounds from plants. They have a complex chemistry but are mainly terpenes and terpenoids. The monoterpenes are the major class of chemical compounds found in essential oils. Essential oils are also known as Volatile oils.
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Question 8
Q8.  The percentage of carbon in steel is ____________ .
 

Answer :  0.5 to 1.5


Steel is an alloy of Iron with Carbon, which may contribute upto 2.1 % of its weight. Steels are described as mild, medium or high-carbon steels according to the percentage of carbon they contain, although this is never greater than about 1.5 %. The percentage of Carbon in High Carbon Steel is 0.45 % to 1.50 %.
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Question 9
Q9.  The major use of Sulphur is in the manufacture of
 

Answer :  H2SO4


The major use of Sulphur is in the manufacture of Sulphuric Acid ( H2SO4 ) which is one of the most important compound made by the chemical industry. It is used to make, literally, hundreds of compounds needed by almost every industry.
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Question 10
Q10.  Atoms of different elements have
 

Answer :  different atomic number and different number of valence electrons


Each element's atoms have a different number of protons, neutrons, and electrons, which is why they have different atomic numbers, difference in valence electrons and other properties. Their reactivity also varies because of the number and activeness of the electrons in the atom.
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