SOME BASIC CONCEPTS OF CHEMISTRY Quiz-31

Some basic concepts of chemistry Quiz-31

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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.Iodometric method can be used to estimate

•  MnO_2,Cr_2 O_7^(2-),H_2 O_2,CuSO_4
•  CaOCl_2,MnO_2,CuSO_4,Cl_2
•  Cr_2 O_7^(2-),CaOCl_2,H_2 O_2
•  All the above are correct sets

Solution

Any oxidizing agent that can oxidize Kl to l_2 which can be estimated by hypo, can be determined by iodometric titration

Q2.1000 g CaCO_3 solution contains 10 g carbonate. The concentration of solution as carbonate is

•  10 ppm
•  100 pm
•  1000 ppm
•  10000 ppm

Solution

Q3. Consider the following pairs, I.CH_4,C_2 H_6 II. CO,CO_2 III. NO,NO_2 IV. H_2 O,H_2 O_2 In which cases, law of multiple proportion is followed?

•  I, II
•  I, II, III
•  I, III, IV
•  I, II, III, IV

Solution

Q4. 2KClO_3→2KCl+3O_2.5.0 g of KClO_3 gave 0.03 mole of O_2. Hence, percentage purity of KClO_3 is

•  49%
•  50%
•  95%
•  98%

Solution

Q5. I^- reduces HNO_2 to

•  N_2
•  NO
•  N_2 O
•  NO_2

Solution
 

Q6. Radius of water molecule is (assuming it spherical)

•  19.27 nm
•  19.27 Å
• 192.7 pm
•  19.27 μm

Solution

Q7. When microcosmic salt is heated, transparent bead is of

•  NaPO_3
•  Na(NH_4 )HPO_4
•  NaBO_2
•  B_2 O_3

Solution

Q8. 

•  BaCr_2 O_7
•  BaCrO_4
•  BaCrO_4
•  Ba_2 Cr_2 O_4

Solution

Q9. Which pair has same percentage of carbon?

•  CH_3 COOH andC_6 H_12 O_6
•  CH_3 COOH andC_12 H_22 O_11
•  CH_3 COOH andC_2 H_5 OH
•  C_6 H_12 O_6andC_12 H_22 O_11

Solution

Same empirical formulae

Q10. When 1×10^(-3) mol of the chloride of an element Y was completely hydrolysed, it was found that the resulting solution required 20 mL of 0.1 M aqueous silver nitrate for complete precipitation of the chloride ion. Element Y could be

•  Aluminium
•  Phosphorus
•  Silicon
• Sulphur

Solution