Chemistry questions
29404 published questions with worked solutions.
- The number of milli equivalent contained in 0.5 litre of 0.2 N solution is:
- The oxide of a metal contains 60 % of the metal. What will be the percentage of bromine in the bromide of the metal, if the...
- In the aqueous solution of sulphuric acid the mole fraction of water is 0.85. the molality of the solution is :
- The concentration of solution containing 0.5 mole H_3PO_4 dissolved in 500 g water:
- The normality of 0.3 M phosphorous acid ( H_3PO_3 ) is :
- To prepare a standard solution of a substance, we use:
- The term atom molecule were introduced by:
- 1.60 g of a metal were dissolved in HNO_3 to prepare its nitrate. The nitrate on strong heating gives 2 g oxide. The equivalent...
- If one mole of H_2SO_4 reacts with an excess of NaOH, how many moles of water are formed?
- 1.0 g of hydrogen contains 6 10^ 23 atoms. The atomic weight of helium is 4. If follows that the number of atoms in 1 g of He is:
- 0.5 g of fuming H_2SO_4 (oleum) is diluted with water. This solution is completely neutralized by 26.7 mL of 0.4 N NaOH. The...
- The equivalent weight of a divalent metal is 31.82. The weight of single atom is:
- A solution of known normality is diluted to two times. Which of the following changes during dilution?
- 100 mL of PH_3 when decomposed produces phosphorus and hydrogen. The change in volume is:
- The maximum amount of BaSO_4 precipitated on mixing 20 mL of 0.5 M BaCl_2 with 20 mL of 1 M H_2SO_4 is:
- Avogadro's number is the number of molecules present in:
- 0.52 g of dibasic acid required 100 mL of 0.1 N NaOH for complete neutralization. The equivalent weight of acid is:
- The maximum number of molecules is present in:
- The numerical value of N/n (where N is number of molecules is n moles of gas) is:
- The normality of 1% (wt./vol.) H_2SO_4 is nearly: