RK International School Chemistry Questions PDF

**R.K International School** **Subject - Chemistry** 1. Dimensions of pressure are same as that of a. Energy b. force c. energy per unit time d. force per unit time 2. The significant figures in 33.00 are a. 2 b. 3 c. 6 d. 4 3. Two oxides of a metal contain 36.4% and 53.4% of oxygen by ma...

**R.K International School** **Subject - Chemistry** 1. Dimensions of pressure are same as that of a. Energy b. force c. energy per unit time d. force per unit time 2. The significant figures in 33.00 are a. 2 b. 3 c. 6 d. 4 3. Two oxides of a metal contain 36.4% and 53.4% of oxygen by mass respectively. If the formula of the first oxide is M~2~O, then that of second is a. M­­~2~O b. MO c. MO­~2~ d. M~2~O~2~ 4. An organic compound contain 24% carbon , 4% hydrogen and remaining chlorine. Its empirical formula is a. CHCl b. CH­~2~Cl c. CHCl~2~ d. CH~3~Cl 5. The simplest formula of a compound containing 50% of element X (Atomic mass=10) and 50% of element Y (atomic mass=20) is a. XY b. X~2~Y c. XY~3~ d. X~2~Y~3~ 6. The number of molecules in 100 ml of H~2~SO~4~ ( d= 1.9 g/mL) is a. 11.68 \* 10­~­~^23^ b. 6.02 \* 10^18^ c. 11.68 \* 10^22^ d. 6.02 \* 10^22^ 7. The ratio of masses of oxygen and nitrogen in a particular gaseous mixture is 1:4. the ratio of their molecule is a. 3:16 b. 1:4 c. 7:32 d. 1:8 8. Among the following pairs of compounds , the one theat illustrates the law at multiple proportions is a. Law of constant proportion b. Law od conservation of mass 9. Which of the following has maximum number of molecules a. 8 g H~2~ b. 64 g SO~2~ c. 44 g CO~2~ d. 48 g O~2~ 10. At what temperature will both Celcius and Farenheit scales read the same value a. 33 b. 50 c. -40 d. -50.