SOME BASIC CONCEPTS OF CHEMISTRY Quiz-15

 

SOME BASIC CONCEPTS OF CHEMISTRY Quiz-15

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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 molality of 1 L solution with x% H_2 SO_4 is equal to 9. The weight of the solvent present in the solution is 910 g. The value of x is:  :

•  90
•  80.3
•  40.13
•  9

Solution

Q2.1 kg of NaOH solution contains 0.04 g of NaOH. The approximate concentration of solution is

•  0.04 ppm
•  0.004 ppm
•  40 ppm
•  400 ppm

Solution
option c

Q3.Equal volumes of 0.200 M HCl and 0.400 M KOH are mixed. The concentration of the principal ions in the resulting solution are  

•  [K^+ ]=0.400 M,[Cl^- ]=0.200 M,[H^+ ]=0.200 M
•  [K^+ ]=0.200 M,[Cl^- ]=0.200 M,[OH^- ]=0.100 M
•  [K^+ ]=0.200 M,[Cl^- ]=0.100 M,[OH^- ]=0.100 M
•  [K^+ ]=0.200 M,[Cl^- ]=0.100 M,[OH^- ]=0.200 M

Solution

Q4.With MnO, colour of the bead in sodium carbonate-bead test is

•  Pink
•  Black
•  Yellow
•  Green

Solution
option d

Q5.36.6 g of the crystal hydrate of barium chloride when roasted lose 5.4 g in mass. Thus, salt is

•  

  BaCl_2 ∙ 5H_2 O

•  BaCl_2 ∙4H_2 O
•  BaCl_2 ∙3H_2 O
•  BaCl_2 ∙2H_2 O

Solution
 

Q6.In the following reaction : N〖O_3〗^⊖+As_2 S_3+H_2 O→AsO_4^( 3-)+NO+SO_4^( 2-)+H^⊕ The equivalent weight of As_2 S_3 (with molecular weight M) is: style="text-indent: -48px; white-space: pre">

•  3M/28
•  M/4
• M/24
•   M/28

Solution

Q7.1.2 g of Mg is treated with 100 mL of 1 M H_2 SO_4.Molar concentration of the H_2 SO_4solution after complete reaction is

•  0.5 M
•  0.005 M
•  0.10 M
•  0.20 M

Solution

Q8.2H_2 O_2 (l)→2H_2 O(l)+O_2 (g) 100 mLof Xmolar H_2 O_2 gives 3 L of O_2 gunder the condition when 1 mole occupies 24 L, value of X is

•  2.5
•  1.0
•  0.5
•  0.25

Solution

Q9.Mole fraction of a solute in an aqueous solution is 0.2. The molality of the solution will be

•  13.88
•  1.388
•  0.138
•  0.0138

Solution

Q10.The molarity of H_2 SO_4 is 18 M. Its density is 1.8 g mL^(-1). Hence, molality is:  

•  36
•  200
•  500
• 18

Solution

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