NEET News

### What is the value of Avagadro Constant

Avagadro Constant = 6.022 x 10²³ atoms/mol Explanation

Avagadro number is the number of particles (atoms or molecules), that is contained in the amount of substance given by one mole. Avogadro’s constant, often designated with […]

### What is the mass of precipitate formed when x mL of solution is mixed with another

What is the mass of precipitate formed when 50 mL of 16.9% solution of AgNO₃ is mixed with 50 mL of 5.8% NaCl Solution? (Ag=107.8, N=14, O=16, Na=23, Cl=35.5)

Options

(a) 28 g (b) […]

### If avagadro number is changed what changes

If avagadro number is changed from 6.022 x 10²³ mol⁻¹ to 6.022 x 10²⁰ mol⁻¹, this would change

Options

(a) the definition of mass in units of grams (b) the mass of one […]

### The number of water molecules is maximum in

The number of water molecules is maximum in

Options

(a) 1.8 molecules of water (b) 1.8 gram of water (c) 18 gram of water (d) 18 moles of water

18 moles […]

### Magnesium carbonate of x g decomposes. What is the percentage of purity

20.0 g of a magnesium carbonate sample decomposes on heating to give CO₂ and 8.0 g magnesium oxide. What will be the percentage purity of magnesium carbonate in the sample?

Options

(a) 75 (b) […]

### What is the molar ratio of mixture of gases given the ratio of gases

A mixture of gases contains H₂ and O₂ gases in ratio of 1:4(w/w). What is the molar ratio of the two gases in the mixture?

Options

(a) 4:1 (b) 16:1 (c) 2:1 (d) […]

### When x g of magnesium burnt with oxygen what is left

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, O₂=16)

Options

(a) Mg, 0.16g (b) O₂, 0.16g […]

### When x litres hydrogen and chlorine are mixed, moles of HCl is

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

Options

(a) 1 mol of Hcl(g) (b) 2 mol of Hcl(g) […]

1 246 247 248