SOME BASIC CONCEPTS OF CHEMISTRY Quiz-18

 

SOME BASIC CONCEPTS OF CHEMISTRY Quiz-18

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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.A mixture contains NO_2^- and SO_3^(2-). On adding dilute H_2 SO_4 and KI and then starch, blue colour appears. This is due to  :

•  NO_2^-
•  SO_3^(2-)
•  Both (a) and (b)
•  None of these

Solution

Q2.100 mL of 20.8% BaCl_2 solution and 50 mL of 9.8% H_2 SO_4 solution will form BaSO_4 (Ba=137,Cl=35.5,S=32,H=1,O=16) BaCl_2+H_2 SO_4→BaSO_4+2HCl

•  23.3 g
•  11.65 g
•  30.6 g
•  None of these

Solution

Q3.In which case purity of the substance is 100%?  

•  1 mole of CaCO_3 gave 11.2 L CO_2 (at STP)
•  1 mole of MgCO_3 gave 40.0 g MgO
•  1 mole of NaHCO_3 gave 4 g H_2 O
•  1 mole of Ca(HCO_3 )_2 gave 1 mole CO_2

Solution

Q4.Two samples of HCl of 1.0 M and 0.25 M are mixed. Find volumes of these samples taken in order to prepare 0.75 M HCl solution. Assume no water is added (I) 20 mL,10 mL (II) 100 mL,50 mL (III) 40 mL,20 mL (IV) 50 mL,25 mL

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

Solution

Q5.To increase the molar solubility of CaCO_3 (s) in a saturated aqueous solution add

•  

  More water

•  Na_2 CO_3
•  NaOH
•  NaHSO_4

Solution
 option c

Q6.The molality of a H_2 SO_4solution is 9. The weight of the solute in 1 kg H_2 SO_4solution is

•  900.0 g
•  469 g
• 882.0 g
•  9.0 g

Solution

Q7.A candle is burnt in a beaker until it extinguishes itself. A sample of gaseous mixture in the beaker contains and 6.08×10^20 molecules of O_2, and 0.50 10^20 molecules of CO_2. The total pressure is 734 mm of Hg. The partial pressure of O_2would be

•  760.0 mm of Hg
•  76.0 mm of Hg
•  7.6 mm of Hg
•  0.76 mm of Hg

Solution

Q8.10 mL of 1 M BaCl_2 solution and 5 mL 0.5 M K_2 SO_4 are mixed together to precipitate out BaSO_4. The amount of BaSO_4 precipated will be

•  0.005 mol
•  0.00025 mol
•  0.025 mol
•  0.0025 mol

Solution

Q9.Ethanol-water mixture has 46 g ethanol in 100 g mixture. By a suitable technique volatile component goes off. Thus

•  3 moles of non-volatile component are left
•  9 N_0 atoms of non-volatile component are left
•  9 N_0 atoms of volatile component are separated
•  All the above statements are correct

Solution

Q10.100 mL of 0.01 M H_2 SO_4is neutralized by  

•  100 mL of 0.01 M NaOH
•  100 mL of 0.01 M Ca(OH)_2
•  100 mL of 0.01 M Al(OH)_3
• All the above are correct

Solution

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