SOME BASIC CONCEPTS OF CHEMISTRY Quiz-35

Some basic concepts of chemistry Quiz-35

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IIT JEE exam which consists of JEE Main and JEE Advanced is one of the most important entrance exams for engineering aspirants. The exam is held for candidates who are aspiring to pursue a career in the field of engineering and technical studies. Chemistry is important because everything you do is chemistry! Even your body is made of chemicals. Chemical reactions occur when you breathe, eat, or just sit there reading. All matter is made of chemicals, so the importance of chemistry is that it's the study of everything..

Q1.The decomposition of a certain mass of CaCO_3 gave 11.2 dm^3 of CO_2 gas as STP. The mass of KOH required to completely neutralise the gas is

•  56 g
•  28 g
•  42 g
•  20 g

Solution

Q2.The molarity (conc. In mol L^(-1)) of H_2 SO_4 solution, which has a density 1.84 g/cc at 35℃ and contains 98% by weight is

•  1.84 M
•  18.4 M
•  20.6 M
•  24.5 M

Solution

Q3. The normality of solution obtained by mixing 10 mL of N/5 HCl and 30 mL of N/10 HClis

•  0.067 N
•  0.2 N
•  0.133 N
•  0.125 N

Solution

Q4. What would you observe if you add with shaking excess dil. NaOH solution to ZnCl_2 solution?

•  A white ppt
•  A white ppt which later dissolves
•  A green ppt
•  A green ppt which later dissolves

Solution

Q5. Hardness of water is measured in terms of ppm (parts per million) of CaCO_3.It is the amount (in g) of CaCO_3 present in 10^6 g H_2 O. In a sample of water, 10 L required 0.56 g of CaO to remove temporary hardness of HCO_3^- Ca(HCO_3 )_2+CaO→2CaCO_3+H_2 O Temporary hardness is

•  200 ppm CaCO_3
•  100 ppm CaCO_3
•  50 ppm CaCO_3
•  25 ppm CaCO_3

Solution
 

Q6. To 1 L of 1.0 M impure H_2 SO_4 sample, 1.0 M NaOH solution was added and a plot was obtained as followsThe % purity of H_2 SO_4 and the slope of curve, respectively, are:

•  75%,-1/2
•  75%,-1
• 50%,- 1/3
•  50%,-1/2

Solution

Q7. The Ew of an element is 13. It forms an acidic oxide which with KOH forms a salt isomorphous with K_2 SO_4. The atomic weight of element is

•  13
•  26
•  52
•  78

Solution

Q8. NaHC_2 O_4 is 0.1 M when neutralized with NaOH.Hence, it is --------- when oxidized with MnO_4^-/H^+

•  0.1 N
•  0.2 N
•  0.05 N
•  0.15 N

Solution

Q9. 0.106 g of Na_2 CO_3 completely neutralizes 40.0 mL of H_2 SO_4.Hence, normality of H_2 SO_4solution is

•  0.05 N
•  0.025 N
•  0.10 N
•  0.20 N

Solution

Q10. In diammonium phosphate (NH_4 )_2 HPO_4, the percentage of P_2 O_5 is

•  35.87
•  46.44
•  51.99
• 53.78

Solution