The Language of Chemistry-MCQs-Class 9

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

The Language of Chemistry-MCQs-Class 9

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