Chemistry questions
29404 published questions with worked solutions.
- A metal oxide contains 20% oxygen by weight. Equivalent weight of metal is
- In the standardisation of Na_2S_2O_3 using K_2Cr_2O_7 by iodometry, the equivalent weight of K_2Cr_2O_7 is
- 74.5 g of a metallic chloride contain 35.5 g of chlorine. The equivalent weight of the metal is
- Number of atoms of He in 100 u of He (atomic weight of He is 4) are
- The molecular mass of a compound (X) if its 3.0115 10^ 9 molecules weigh 1.0 10^ -12 g is
- Equivalent mass of a metal is 12 g mol^ -1 . Hence, equivalent mass of its oxide is
- A divalent metal has 12 equivalent weight. The molecular weight of its oxide is
- The oxide of an element contains 67.67% of oxygen. Equivalent weight of the element is
- Sulphur forms the chlorides S_2Cl_2 and SCl_2 ; the equivalent mass of the sulphur in SCl_2 is 16 g equivalent^ -1 . Thus,...
- The same amount of a metal combines with 0.200 g of oxygen and with 3.17 g of a halogen. Hence, equivalent mass of halogen is
- In the combustion of 5.00 g of a metal, 9.44 g of metal oxide are formed Hence, equivalent mass of the metal is
- One part of an element A combines with two parts of B (another element). Six parts of element C combine with four parts of...
- In the reaction, N_2 + 3 ,H_2 2NH_3 , the ratio of volumes of nitrogen, hydrogen and ammonia is 1: 3: 2. These ratio illustrate...
- Which of the following formulae expresses the law of equivalent correctly?
- What is the SI unit for electrochemical equivalent?
- Which symbol replaces the unit of atomic mass, amu?
- How many moles of magnesium phosphate, Mg_3(PO_4)_2 will contain 0.25 moles of oxygen atoms?
- The number of Na atom in 46 g Na (Atomic weight of Na = 23) is.
- If the density of methanol is 0.8 kg L^ -1 , what is its volume needed for making 4 L of its 0.25M solution?
- 3.011 10^ 23 atoms of an element weights 1.15 g. The atomic mass of the element is