SOME BASIC CONCEPTS OF CHEMISTRY Quiz-34

Some basic concepts of chemistry Quiz-34

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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.Titration of a 0.7439 g sample of impure Na_2 B_4 O_7 (borax) required 31.64 mL of 0.108 M HClfor reaction. In terms of B_2 O_3percentage is

•  46.39%
•  87.73%
•  32.15%
•  10.11%

Solution

Q2.A mixture of formic acid and oxalic acid is heated with cone H_2 SO_4. The gas produced is collected and treated with KOH solution, whereby the volume decreases by 1/6th. The molar ratio of the two acids (formic acid/oxalic acid) is

•  4:1
•  1:4
•  2:1
•  1:2

Solution

Q3. Sulphuryl chloride SO_2 Cl_2 reacts with water to give a mixture of H_2 SO_4and HCl. Moles of NaOHrequired to neutralize the solution formed by adding 1 mol of SO_2 Cl_2 to excess water is are

•  1
•  2
•  3
•  4

Solution

Q4. The normality of 0.3 M phosphorous acid (H_3 PO_3) is

•  0.1
•  0.9
•  0.3
•  0.6

Solution

Q5. A bivalent metal has 37.2 equivalent weight. The molecular weight of its chloride is

•  216.6
•  148.8
•  145.4
•  172.8

Solution
 

Q6. If CO_2 gas is passed into aq Na_2 CrO_4 yellow solution

•  aq Na_2 Cr_2 O_7 (orange) solution is formed
•  aq Cr_2 (CO_3 )_2 is formed
• Cr(OH)_3 is precipitated
•  No action

Solution

Q7. RH_2 (ion exchange resin) can replace Ca^(2+) in hard water1 L of hard water after passing through RH_2 has pH=2. Hence, hardness in ppm of Ca^(2+) is

•  200
•  100
•  50
•  125

Solution

Q8. A student performs a titration with different burettes and finds titre values of 25.2 mL, 25.25 mL, and 25.0mL. The number of significant figures in the average titre value is

•  1
•  2
•  3
•  4

Solution

Q9. In the reaction1 mol of CrO_5 will liberate how many moles of O_2?

•  5/2
•  5/4
•  9/2
•  None of these

Solution

Q10. Ammonia in 0.224 g of a compound Zn(NH_3 )_x Cl_2 is neutralised by 30.7 mL of 0.20 M HCl. The value of x in the formula is

•  4
•  5
•  6
• 8

Solution