One mole of carbon atom weighs 12 g, the number of atoms in it is equal to, (Mass of carbon-12 is 1.9926 × 10–23 g)
(1) 6.022 × 1023
(2) 1.2 × 1023
(3) 6.022 × 1022
(4) 12 × 1022
The number of atoms in 0.1 mol of a triatomic gas is (NA = 6.02 × 1023 mol-1) (a) 6.026 × 1022 (b) 1.806 × 1023 (c) 3.600 × 1023 (d) 1.800 × 1022
If Avogadro number NA, is changed from 6.022 1023 mol-1 to 6.022 1020 mol-1, this would change (a) the mass of one mole of carbon (b) the ratio of chemical species to each other in a balanced equation (c) the ratio of elements to each other in a ...
When 22.4 litres of H2(g) is mixed with 11.2 litres of Cl2(g), each at S.T.P, the moles of HCl(g) formed is equal to (a) 1 mol of HCl(g) (b) 2 mol of HCl(g) (c) 0.5 mol of HCl(g) (d) 1.5 mol of HCl(g).
In an experiment it showed that 10 mL of 0.05 M solution of chloride required 10 mL of 0.1 M solution of AgNO3, which of the following will be the formula of the chloride (X stands for the symbol of the element other than chlorine) (a) X2Cl2 (b) XCl2 (c) ...
1.0 g of magnesium is burnt with 0.56 g O2 in a closed vessel. Which reactant is left in excess and how much? (At. wt. Mg = 24, O = 16) (a) Mg, 0.16 g (c) Mg, 0.44 g (b) O2, 0.16 g (d) O2, 0.28 g
25.3 g of sodium carbonate, $\require{mhchem}\ce{Na2CO3}$ is dissolved in enough water to make 250 mL of solution. If sodium carbonate dissociates completely, molar concentration of sodium ion, $\ce{Na+}$ and carbonate ions, $\ce{CO3^2-}$ are respectively (...
Suppose the elements $X$ and $Y$ combine to form two compounds $XY_2$ and $X_3Y_2$. When $0.1$ mole of $XY_2$ weighs $10\ g$ and $0.05$ mole of $X_3Y_2$ weighs $9\ g$, the atomic weights of $X$ and $Y$ are (a) $40,\ 30$ (b) $60,\ 40$ (c) $20,\ 30$ (d) $30,\...
4.5 gm of solute having molar mass of 90 gm/mol is dissolved in water to make 250 ml solution. Calculate molarity of the solution Numerical Value Type
The number of moles of hydrogen molecules required to produce 20 moles of ammonia through Haber's process is : (1) 10 (2) 20 (3) 30 (4) 40
10 g of hydrogen and 64 g of oxygen were filled in a steel vessel and exploded. Amount of water produced in this reaction will be (a) 3 mol (b) 4 mol (c) 1 mol (d) 2 mol
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