SOME BASIC CONCEPTS OF CHEMISTRY Quiz-32

Some basic concepts of chemistry Quiz-32

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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.Sodium combines with _17^35 Cl and _17^37 Cl to give two samples of sodium chloride. Their formation follows the law of

•  Gaseous diffusion
•  Conservation of mass
•  Reciprocal proportion
•  None of these

Solution

There are two types of NaCl formed. They differ in molar masses due to different isotopes of Cl

Q2.Silver metal reacts with chlorine (Cl_2 ) to yield silver chloride. If 2.00 g of Ag react with 0.657 g of Cl_2, empirical formula of silver chloride is

•  AgCl_2
•  Ag_2 Cl
•  AgCl
•  AgCl_3

Solution

Q3. After 20 ml of 0.1 M Ba(OH)_2 is mixed with 10 mL of 0.2 M HClO_4, the concentration of ions is

•  2×10^(-3) M
•  10^(-3) M
•  0.066 M
•   ions are completely neutralized

Solution

Q4. In the standardization of Na_2 SO_3 using K_2 Cr_2 O_7 by iodometry, the equivalent weight of K_2 Cr_2 O_7 is

•  Mw/2
•  Mw/6
•  Mw/3
•  Same as the molecular weight

Solution

Q5. Water gas consisting of equal volumes of CO and H_2is produced when water vapour is passed over red hot coal. Volume of water gas produced under standard state when 3.0 kg of coal is treated for water gas is

•  5.6×10^2 L
•  11.2 ×10^3 L
•  2.8×10^2 L
•  22.4×10^3 L

Solution
 

Q6. If the equivalent weight of an element is 32, then the percentage of oxygen in its oxide is

•  16/span>
•  40
• 32
•  20

Solution

Q7. KI reacts with H_2 SO_4 producing I_2and H_2 S. The volume of 0.2 M H_2 SO_4 required to produce 0.1 mol of H_2 S is

•  4 L
•  2.5 L
•  3.8 L
•  5 L

Solution

Q8. In which mode of expression, the concentration of a solution remains independent of temperature?

•  Molarity
•  Normality
•  Formality
•  Molality

Solution

Q9. 25.0 g of FeSO_4∙7H_2 O was dissolved in water containing dilute H_2 SO_4, and the volume was made up to 1.0 L. 25.0 mL of this solution required 20 mL of an N/10 KMnO_4 solution for complete oxidation. The percentage ofFeSO_4∙7H_2 O in the acid solution is

•  78%
•  98%
•  89%
•  79%

Solution

Same empirical formulae

Q10. 10 g of MnO_2 on reaction with conc HCl liberated 0.1 equivalent of Cl_2 (Mn=55). Hence, per cent purity of MnO_2is

•  87.0
•  21.75
•  50.0
• 43.5

Solution