Question 51 : The metal used to recover copper from a solution of copper sulphate is
1. Na
2. Ag
3. Hg
4. Fe
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Question 52 : The main use of salt in the diet is to
1. make the taste of food better
2. produce in small amounts the hydrochloric acid required for the digestion of food
3. ease the process of cooking
4. increase the solubility of food particles in water
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Question 53 : The inherited traits of an organism are controlled by
1. RNA molecules
2. nucleotides
3. DNA molecules
4. enzymes
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Question 54 : The inexpensive and commonly used variety of glass is called soda glass. It is called so because
1. was used initially for making bottles of soda(carbonated drink)
2. is made using soda(sodium carbonate)
3. was initially used for storing sodium carbonate
4. is made using soda lime
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Question 55 : The metallurgical process in which a metal is obtained in a fused state is called
1. smelting
2. roasting
3. calcinations
4. froth floatation
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Question 56 : The number of atoms present in 21.6 gram of silver (atomic weight = 108) are same as the molecules in
1. 1.8 gram of H₂O
2. 12 moles of KMnO₄
3. 0.6N H₂SO₄
4. 4.6 gram of C₂H₅OH
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Question 57 : The mass of one Avogadro number of helium atom is
1. 1.00 gram
2. 4.00 gram
3. 8.00 gram
4. 4 x 6.02 x 10²³ gram
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Question 58 : The graphite rods in the nuclear reactor
1. react with U to release energy
2. produce neutrons
3. undergo combustion which triggers the nuclear fission
4. convert fast moving neutrons into thermal neutrons
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Question 59 : The half life period of an isotope is 2 hours. After 6 hours what fraction of the initial quantity of the isotope will be left behind?
1. 6-Jan
2. 3-Jan
3. 8-Jan
4. 4-Jan
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Question 60 : The maximum number of isomers for an alkene with molecular formula C₄H₈ is
1. 5
2. 4
3. 2
4. 3
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