| May 29th, 2017 01:28 PM | |
| Vishal Kotkar | Re: eamcet chemistry The sample questions on Some Basic Concepts of Chemistry for the EAMCET examination required for preparation has been given below: 1. What volume of Hydrogen will be liberated at STP when 8gm of Calcium completely reacts with water? (AIIMS 2010) 1)0.2 cc 2) 0.4cc 3) 224 cc 4) 4480 cc Ans: 4 [Ca + 2 H2O→ Ca (OH)2+H2] 2. 20 Kg of N2 and 3 Kg of H2 are mixed to produce NH3(g).The mass of Ammonia formed is (PMT2011) 1)17Kg 2) 34 Kg 3) 20 Kg 4)3 kg Ans: 1. [N2+3H2→ 2NH3] 3. What is the volume (lit) of oxygen required at STP to completely convert 1.5moles of sulphur into sulphurdioxide? (E - 03) 1) 11.2 2) 22.4 3) 33.6 4) 44.8 Ans: 3 [HINT: S+O2→SO2] 4. ‘X’ litres of carbonmonoxide is present at STP. It is completely oxidised to CO2. The volume of CO2 formed is 11.207 litres at STP. What is the value of ‘X’ in litres? (E - 2002) 1) 22.414 2) 11.207 3) 5.6035 4) 44.828 Ans: 2 [HINT: 2CO+O2→2 CO2] 5. One mole of fluorine is reacted with two moles of hot and concentrated KOH. The products formed are KF, H2O and O2. The molar ratio of KF, H2O and O2 respectively (E - 2002) 1) 1: 1: 2 2) 2: 1: 0.5 3) 1: 2: 1 4) 2: 1: 2 Ans: 2 [2F2+4KOH→ 4KF+ 2H2O+ O2] 6. 10 g of CaCO3 is completely decomposed to X and CaO. X is passed into an aqueous solution containing one mole of sodium carbonate. What is the number of moles of sodium bicarbonate formed? (M - 2004) 1) 0.2 2) 0.1 3) 0.01 4) 10 Ans: 1 [CaCO3→CaO + CO2 and Na2CO3 + H2O + CO2 → 2NaHCO3] 7. What is the volume (in litres) of CO2 liberated at STP, when 2.12gms of sodium carbonate (MW=106) is treated with excess dilute HCl? (E - 2000) 1) 2.28 2) 0.448 3) 44.8 4) 22.4 Ans: 3 [Na2CO3 + 2HCl→2 NaCl + H2O + CO2] 8. Two grams of sulphur is completely burnt in oxygen to form SO2. In this reaction, what is the volume (in litres) of oxygen consumed at STP? (At.wts. of sulphur and oxygen are 32 and 16 respectively) (E2002) 1) 16/22.414 2) 22.414/16 3) 22.414/32 4) 32/22.414 Ans: 2 [ S+O2→ SO2] 9. At T (K), 100 litres of dry oxygen is present in a sealed container. It is subjected to silent electric discharge, till the volumes of oxygen and ozone become equal. What is the volume (in litres) of ozone formed at T (K)? (E-2006) 1) 50 2) 60 3) 30 4) 40 Ans: 4 [3O2→ 2O3] 10. ‘S’ grams of calcium carbonate were completely burnt in air. The weight of the solid residue formed is 28 g. What is the value of 'S' (in grams)? (E - 2005) 1) 44 2) 200 3) 150 4) 50 Ans: 4 [CaCO3→ CaO + CO2] 11. Four grams of hydrocarbon (Cx Hy) on complete combustion gave 12 grams of CO2. What is the empirical formula of the hydrocarbon? (M-2005) 1) CH3 2) C4 H9 3) CH 4) C3 H8 Ans: 1 12. An organic compound containing C and H has 92. 3 % of carbon. Its empirical formula is (M - 2004) 1) CH 2) CH3 3) CH2 4) CH4 Ans: 1 13. An organic compound is found to contain C = 54.5%, O=36.4% and H = 9.1% by mass. Its empirical formula is (KCET) 1) CH2O 2) CHO2 3) C2H4O 4) C3H4O Ans: 3 14. The molecular weight of an organic compound is 180. Its empirical formula is CH2O. The molecular formula is (E- 1996) 1) C6H12O6 2) C7H16O5 3) C8H4O5 4) C5H8O7 Ans: 1 15. 0.262g of a substance gave, on combustion, 0.361g of CO2 and 0.147g of H2O. What is the empirical formula of the substance (E - 1996) 1) CH2O 2) C3H6O 3) C3H6O2 4) C2H6O2 Ans: 1 16. Four grams of hydrocarbon (CxHy) on complete combustion gave 12grams of CO2.What is the empirical formula of the hydrocarbon (C = 12; H = 1) (E-2005) 1) CH3 2) C4H9 3) CH 4) C3H8 Ans: 4 17.An alkane has C/H ratio (by mass) of 5.1428. Its molecular formula is (KCET) 1) C5H12 2) C6H14 3) C8H18 4) C7H16 Ans: 2 18. A dibasic acid containing C, H and O was found to contain C=26.7% and H=2.2%. The vapour density of its dimethyl ester was found to be 73. The molecular formula of the acid is (AIIMS 2005) 1) CH2O2 2) C2H2O4 3) C3H3O4 4) C2H4O4 Ans: 2 19. 10ml of an alkane on complete combustion gave 40ml of CO2 under the same conditions. The formula of the alkane is 1) C2H6 2) C3H8 3) C5H12 4) C4H10 Ans: 4 20. 15 c.c. of gaseous hydrocarbon required 45 c.c. of oxygen for complete combustion and 30 c.c. of carbondioxide is formed. The formula of the hydrocarbon is (BHU) 1) C3H6 2) C2H2 3) C4H10 4) C2H4 Ans: 4 |
| May 29th, 2017 01:27 PM | |
| Unregistered | Re: eamcet chemistry Hi I would like to have the sample questions on Some Basic Concepts of Chemistry for the EAMCET examination required for preparation? |
| July 8th, 2016 10:22 AM | |
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