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Which of the following reagents gives a silver mirror test
when added to aldehydes?
1 Fehling’s solution
2 Tollen’s Reagent
3 Ebaeyer’s Reagent
4 Nessler’s Reagent
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The presence of which of the following salts in water causes corrosion in steam boilers? 1 Sodium chloride 2 Magnesium chloride 3 Calcium bicarbonate 4 Potassium bicarbonate
What is the life cycle ?
What are pulsars?
what is defination of conductivity? How much conductivity of water ? what is effect when conductity of water low or high?
Which of the following shows the masses of three elementary particles in decreasing order? 1 Mesons, Baryons, Leptons 2 Leptons, Baryons, Mesons 3 Baryons, Mesons, Leptons 4 Leptons, Mesons, Baryons
Which of the following metals can displace hydrogen from dilute acids? 1 Zinc 2 Gold 3 Copper 4 Silver
The rate of chemical reaction does not depend upon 1 Concentration 2 Catalyst 3 Temperature 4 Pressure
The two elements that are frequently used for making transistors are 1 Boron and aluminium 2 Silicon and germanium 3 Iridium and tungsten 4 Niobium and columbium
The ratio of pure gold in 18 carat gold is 1 60% 2 75% 3 80% 4 100%
3 Answers DSSSB-Delhi Subordinate Service Selection Board,
What is the capacity of arihant’s atomic reactor?
Science as a social endeavor .Explain
0 Answers Mahatma Gandhi University,
The age of most ancient geological formations is estimated by 1 Potassium-argon method 2 Ra-Si method 3 C14method 4 Uranium-lead method
Biological Sciences 
