Q.26:- If ten volumes of dihydrogen gas reacts with five volumes of dioxygen gas, how many volumes of water vapour would be produced? Answer:- Dihydrogen gas reacts with dioxygen gas as,…

Q.26:- If ten volumes of dihydrogen gas reacts with five volumes of dioxygen gas, how many volumes of water vapour would be produced? Answer:- Dihydrogen gas reacts with dioxygen gas as,…

Q.25:- How are 0.50 mol Na2CO3and 0.50 M Na2CO3 different? Answer:- Molar mass of Na2CO3 = (2×23)+12.00+(3×16) = 106 g mol-1 ∴0.50 mol Na2CO3 means 0.50×106g = 53g 0.50 M Na2CO3 means 0.50 mol of Na2CO3 i.e. 53g of…

Q.24:- Dinitrogen and dihydrogen react with each other to produce ammonia according to the following chemical equation: N2(g) + H2(g) → 2NH3(g) (i) Calculate the mass of ammonia produced if 2.00×103g dinitrogen reacts with…

Q.23:- In a reaction A + B2 → AB2 Identify the limiting reagent, if any, in the following reaction mixtures. (i) 300 atoms of A + 200 molecules of B (ii) 2…

Q.22:- If the speed of light is 3.0 × 108ms-1, calculate the distance covered by light in 2.00 ns. Answer:- Distance covered = Speed×Time = 3.0 × 108ms-1 × 2.00 ns =…

Q.21:- The following data are obtained when dinitrogen and dioxygen react together to form different compounds: Mass of dinitrogen Mass of dioxygen (i) …

Q.20:- Round up the following upto three significant figures: (i) 34.216 (ii) 10.4107 (iii) 0.04597 (iv) 2808 Answer:- (i) 34.2 (ii) 10.4 (iii) 0.046 (iv) 2810

Q.19:- How many significant figures are present in the following? (i) 0.0025 (ii) 208 (iii) 5005 (iv) 126,000 (v) 500.0 (vi) 2.0034 Answer:- (i) 2 (ii) 3 (iii) 4 (iv)…

Q.18:- Express the following in the scientific notation: (i) 0.0048 (ii) 234,000 (iii) 8008 (iv) 500.0 (v) 6.0012 Answer:- (i) 0.0048 = 4.8×10-3 (ii) 234, 000 = 2.34×105 (iii) 8008…

Q.17:- A sample of drinking water was found to be severely contaminated with chloroform, CHCl3, supposed to be carcinogenic in nature. The level of contamination was 15 ppm (by mass). (i)…