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Which of the following atoms and ions are isoelectronic i.e. have the same number of electrons with the neon atom: (1) F - (2) Oxygen atom (
what is colloid?
Chloride of metal is MCl 2 . The formula of its phosphate will be: (1) M 2 PO 4 (2) M 3 (Po 4 ) 2 (3) M 2 (
bomb calorimeter
A sample of gas occupies 10l under a pressure of 1atm. what will be its volume if the pressure is increased to 2atm ? assuming that temperature of the gas sample does not change
The atomic number of an element is 35 and mass number is 81. The number of electrons in the outer most shell is: (1) 7 (2) 6 (3) 5 (4) 3 Ans: 7
20ml of water sample requires 15ml of 0.1mg/l sodium carbonate using phenolphthalein indicator. state the type of acidity and calculate the acidity
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is co2 stable molecule justify
what is hydrated copper
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