StandardClass 9MCQTo Show The Language of Chemistry-MCQs-Class 9 By All About Chemistry - May 27, 2021 0 387 The Language of Chemistry Test your progress in this Chapter. (20 Questions)All the Best! This Test is not time limited . So before submitting, recheck your answers. As you click the submission button given at the end of the Questions, you will get your result. Scroll up, the correct and incorrect answers will be shown to you. 1.The formula of dichromate ion is (Cr2O5) 2- (Cr2O7) 2- (C2O4) 2- (C2O8) 2- 2.Name of the compound NaClO is - Sodium hypochlorite Sodium Chlorite Sodium Chlorate Sodium Perchlorate 3.The valency of acetate radical is 4 3 2 1 4.Balance the reaction: HNO3 = NO2 + O2 + H2O 4HNO3 = 4NO2 + O2 + 2H2O 2HNO3 = 2NO2 + O2 + H2O 2HNO3 = 3NO2 + O2 + H2O HNO3 = 2NO2 + 2O2 + H2O 5.Balance the reaction: C + HNO3 = CO2 + NO2 + H2O C + 3HNO3 = CO2 + 3NO2 + H2O C + 4HNO3 = CO2 + 4NO2 + 2H2O C + 2HNO3 = CO2 +2 NO2 + H2O C + 4HNO3 = CO2 + NO2 + 4H2O 6.Calculate the % of hydrogen in C2H5OH is- [ C=12, H=1, O=16] 22.5 31.3 13.13 35.5 7. Calculate the % of Sodium in Na2CO3 is- [Na=23, C=12, O=16] 43.38% 26.78% 98.45% 44.87% 8.Molecular weight of Na2CO3.10H2O is- [ Na=23, C=12, O=16, H=1] 377 250 286 765 9.Balance the reaction: Na2S2O3 + I2 → Na2S4O6 + NaI 2Na2S2O3 + 3I2 → Na2S4O6 + 2NaI 2Na2S2O3 + I2 → Na2S4O6 + 2NaI 3Na2S2O3 + I2 → Na2S4O6 + 2NaI 3Na2S2O3 + I2 → 3Na2S4O6 + 2NaI 10.Balance the reaction: CuO + NH3 → Cu + N2 + H2O 2CuO + 2NH3 → 3Cu + N2 + 3H2O 4CuO + 2NH3 → 3Cu + N2 + 3H2O 3CuO + 2NH3 → 3Cu + N2 + 3H2O 5CuO + 2NH3 → 3Cu + N2 + 3H2O 11.Balance the reaction:NH3 + P2O5 + H2O →(NH4)3PO4 6NH3 + P2O5 + 3H2O →2(NH4)3PO4 3NH3 + P2O5 + 3H2O →3(NH4)3PO4 NH3 + P2O5 + 3H2O →2(NH4)3PO4 6NH3 + 4P2O5 + 3H2O →2(NH4)3PO4 12. Calculate the % of Carbon in C6Cl2H10- [ C=12, Cl= 35.5, H=1] 55 33 47 74 13. Calculate the% of N in C6H15N- [C=12, H=1, N=14] 18.44 22.56 35.12 `13.84 14. Which gas is also known as laughing gas? N2O NO NO2 N2O5 15. Formula of bleaching powder is - CaCl2 CaOCl CaO Ca(OCl)Cl 16.Sodium bicarbonate is also known as- Washing soda Baking soda Caustic soda Caustic powder 17. Formula of Methane gas is- C2H4 C2H2 CH4 C5H12 18. Calculate the % of Nitrogen in N2H4- [ N=14, H=1] 87.5 12.5 67.5 76.5 19. The formula of sodium thiosulphate is- Na2S3O2 Na2S2O3 NaSO4 Na2SO3 20. Balance the following: Cu + HNO3 → Cu(NO3)2 + NO + H2O 6Cu + 8HNO3 → 3Cu(NO3)2 + 4NO + 4H2O 2Cu + 8HNO3 → 2Cu(NO3)2 + 2NO + 4H2O 3Cu + 8HNO3 → 3Cu(NO3)2 + 2NO + 4H2O 5Cu + 8HNO3 →5Cu(NO3)2 + 2NO + 4H2O Ready to send
The Language of Chemistry
