SOME BASIC CONCEPTS OF CHEMISTRY Quiz-7

SOME BASIC CONCEPTS OF CHEMISTRY Quiz-7

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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.

 :

•  4.6 g
•  4.0 g
•  2.3 g
•  0.23 g

Solution

Q2.40 mL of 0.05 M solution of Cr^(3+) is oxidized to CrO_4^(2-) by 20 mL of H_2 O_2 .H_2 O_2 is

•  0.15 M
•  0.30 M
•  0.10 M
•  0.20 M

Solution

Q3.Mass of one atom of X is 6.66×10^(-23) g. Hence, number of moles of atom X in 40 kg is 

•  10^3 mol
•  10^(-3) mol
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Solution

 

Q4.0.7 g sample of iron ore was dissolved in acid. Iron was reduced to +2 state and it required 50 ml of M/50 KMnO_4 solution for titration. The percentage of Fe and Fe_3 O_4 in the ore iss 

•  40 % Fe,55.24%,Fe_3 O_4
•  55.24 % Fe,40 %,Fe_3 O_4
•  8 % Fe,11 %,Fe_3 O_4
•  11 % Fe,8 %,Fe_3 O_4

Solution

Q5.To prepare a solution that is 0.50 M KCl starting with 100 mL of 0.40 M KCl

•  

   Add 0.75 g KCl

•   ADD 20 mL of water
•  Add 0.10 mol KCl
•  Evaporate 10 mL water

Solution
 

Q6.

•  1/5
•  2/5
• 3/5
•  5/3

Solution

Q7.

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•  All but Fe^(2+)

Solution

Q8.A mixture upon adding conc. H_2 SO_4 gives orange red fumes. It may contain the anion pair

•  

  
  

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Solution

Q9. 34 g of H_2 O_2 is present in 1120 mL of solution. This solution is called

•  10 vol solution
•  20 vol solution
•  
•  32 vol solution

Solution

 

 

Q10. N_2+3H_2→2NH_3 Molecular weight of NH_3 and N_2 are x_1 are x_2, respectively. Their equivalent weights are y_1 and y_2, respectively. Then (y_1 –y_2 ) is f 

•  

  
  

•  (x_1 –x_2)
•  (3x_1–x_2)
• (x_1 –3x_2)

Solution

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