Practice Questions

Q36.s-block element which cannot be qualitatively confirmed by the flame test is (1) Li (2) Na (3) Rb (4) Be JEE Main 2022 (26 Jun Shift 2) JEE Main Previous Year Paper

Q36.The products obtained during treatment of hard water using Clark's method are (1) CaCO3 and MgCO3 (2) Ca (OH)2 and Mg (OH)2 (3) CaCO3 and Mg (OH)2 (4) Ca (OH)2 and MgCO3

Q36.Hydrogen has three isotopes : protium (1H) , deuterium ( 2H or D ) and tritium ( 3H or T). They have nearly same chemical properties but different physical properties. They differ in (1) Number of protons (2) Atomic number (3) Electronic configuration (4) Atomic mass

Q36.Which one of the following compounds is used as a chemical in certain type of fire extinguishers (1) Washing soda (2) Baking soda (3) Caustic soda (4) Soda ash

Q37.The IUPAC name of ethylidene chloride is (1) 1 - chloroethene (2) 1, 2-dichloroethane (3) 1, 1-dichloroethane (4) 1-chloroethyne

Q37.Among the following, basic oxide is (1) SO3 (2) SiO2 (3) CaO (4) Al2 O3

Q37.Which of the following is an example of conjugated diketone? (1) (2) (3) (4)

Q37.Statement I: An alloy of lithium and magnesium is used to make aircraft plates. Statement II : The magnesium ions are important for cell-membrane integrity. In the light the above statements, choose the correct answer from the options given below (1) Both Statement I and Statement II are true (2) Both Statement I and Statement II are false (3) Statement I is true but Statement II is false (4) Statement I is false but Statement II is true

Q37.Match List-I with Match List-II List-I List-II (Metal) (Emitted light wavelength (nm)) (A) Li (I) 670. 8 (B) Na (II) 589. 2 (C) Rb (III) 780. 0 (D) Cs (V) 455. 5 Choose the most appropriate answer from the options given below (1) (A) −(I), (B) −(II), (C) −(III), (D) −(IV) (2) (A) −(III), (B) −(II), (C) −(I), (D) −(IV) (3) (A) −(III), (B) −(I), (C) −(II), (D) −(IV) (4) (A) −(IV), (B) −(II), (C) −(I), (D) −(III)

Q37.Match List - I with List - II List-II List-II A N2g + 3H2g →2NH3g I Cu B COg + 3H2g →CH4g + H2Og II Cu / ZnO - Cr2O3 C COg + H2g →HCHOg III Fe𝑥O𝑦+ K2O + Al2O3 D COg + 2H2g →CH3OHg IV Ni Choose the correct answer from the options given below (1) A - II, B - IV, C - I, D - III (2) A - II, B - I, C - IV, D - III (3) A - III, B - IV, C - I, D - II (4) A - III, B - I, C - IV, D - II

Q37.The Zeta potential is related to which property of colloids? (1) Colour (2) Brownian movement (3) Charge on surface of colloidal particle (4) Tyndall effect

Q38.Given below are two statements: Statement I : The non bio-degradable fly ash and slag from steel industry can be used by cement industry. Statement II : The fuel obtained from plastic waste is lead free. In the light of the above statements, choose the most appropriate answer from the options given below JEE Main 2022 (27 Jul Shift 2) JEE Main Previous Year Paper (1) Both Statement I and Statement II are correct (2) Both Statement I and Statement II are incorrect (3) Statement I is correct but Statement II is (4) Statement I is incorrect but Statement II is incorrect correct

Q38.When borax is heated with CoO on a platinum loop, blue coloured bead formed is largely due to (1) B2O3 (2) CoBO22 (3) CoB4O7 (4) CoB4O5OH4

Q38.Which among the following pairs has only herbicides? (1) Aldrin and Dieldrin (2) Sodium chlorate and Aldrin (3) Sodium arsinate and Dieldrin (4) Sodium chlorate and sodium arsenite. Q39. 100 mL of 5%(w/v) solution of NaCl in water was prepared in 250 mL beaker. Albumin from the egg was poured into NaCl solution and stirred well. This resulted in a/ an (1) Lyophilic sol (2) Lyophobic sol (3) Emulsion (4) Precipitate

Q38.Given below are two Statements : Statement I : Classical smog occurs in cool humid climate. It is a reducing mixture of smoke, fog and sulphur dioxide. Statement II : Photochemical smog has components, ozone, nitric oxide, acrolein, formaldehyde, PAN etc. In the light of the above statements, choose the most appropriate answer from the options given below. (1) Both Statement I and Statement II are correct. (2) Both Statement I and Statement II are incorrect. (3) Statement I is incorrect but Statement II is (4) Statement I is correct but Statement II is correct. incorrect.

Q38.Aqueous solution of which of the following boron compounds will be strongly basic in nature? (1) NaBH4 (2) LiBH4 (3) B2H6 (4) Na2 B4O7

Q38.Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R Assertion A : Thin layer chromatography is an adsorption chromatography. Reason R : A thin layer of silica gel is spread over a glass plate of suitable size in thin layer chromatography which acts as an adsorbent. In the light of the above statements, choose the correct answer from the options given below (1) Both A and R are true and R is the correct (2) Both A and R are true but R is NOT the correct explanation of A explanation of A (3) A is true but R is false (4) A is false but R is true JEE Main 2022 (28 Jul Shift 2) JEE Main Previous Year Paper

Q38.The correct decreasing order of priority of functional groups in naming an organic compound as per IUPAC system of nomenclature is (1) -COOH > - CONH2 > - COCl > - CHO (2) -SO3H > - COCl > - CONH2 > - CN (3) (4) COOH > - - COOR > - CONH2 > - COCl JEE Main 2022 (26 Jul Shift 2) JEE Main Previous Year Paper

Q39.The eutrophication of water body results in (1) Increase in biodiversity (2) Loss in biodiversity (3) Break down of organic matter (4) decrease in BOD.

Q39.In Carius method of estimation of halogen. 0. 45 g of an organic compound gave 0. 36 g of AgBr. Find out the percentage of bromine in the compound. (Molar masses : AgBr = 188 g mol−1 : Br = 80 g mol−1 ) (1) 34. 04% (2) 40. 04% (3) 36. 03% (4) 38. 04%

Q39.Which of the following is not an example of benzenoid compound? (1) (2) (3) (4)

Q40.Given below are two statements. Statement I : The compound is optically active. Statement II : ​ is mirror image of above compound A. In the light of the above statement, choose the most appropriate answer from the options given below. JEE Main 2022 (29 Jul Shift 2) JEE Main Previous Year Paper (1) Both Statement I and Statement II are correct (2) Both Statement I and Statement II are incorrect. (3) Statement I is correct but Statement II is (4) Statement I is incorrect but Statement II is incorrect. correct.

Q40.The gas produced by treating an aqueous solution of ammonium chloride with sodium nitrite is (1) NH3 (2) N2 (3) N2O (4) Cl2

Q40.The acid that is believed to be mainly responsible for the damage of Taj Mahal is (1) sulfuric acid. (2) hydrofluoric acid. (3) phosphoric acid. (4) hydrochloric acid.

Q40.The measured BOD values tor four difterent water samples (A −D) are as tollows: A = 3 ppm; B = 18 ppm; C = 21 ppm; D = 4 ppm. The water samples which can be called as highly polluted with organic wastes, are (1) A&B (2) A&D (3) B&C (4) B&D