Practice Questions

Q39.NaH is an example of: (1) Electron −richhydride (2) Metallichydride (3) Salinehydride (4) Molecularhydride

Q39.If Ksp of Ag2 CO3 is 8 × 10−12 , the molar solubility of Ag2 CO3 in 0 .1 M AgNO3 is: (1) 8 x 10−13M (2) 8 x 10−11M (3) 8 x 10−12M (4) 8 x 10−10M

Q39.The metal used for making X-ray tube window is: (1) Mg (2) Na (3) Be (4) Ca

Q39.What is the hardness of a water sample (in terms of equivalents of CaCO3) containing 10−3M CaSO4 ? (Molar mass of CaSO4 = 136 g mol−1) (1) 90 ppm (2) 50 ppm (3) 10 ppm (4) 100 ppm

Q39.The pH of rain water is approximately: (1) 5.6 (2) 6.5 (3) 7.5 (4) 7.0

Q39.A hydrated solid X on heating initially gives a monohydrated compound Y. Y upon heating above 373 K leads to an anhydrous white powder Z. X and Z, respectively, are; (1) washing soda and soda ash. (2) baking soda and soda ash. (3) washing soda and dead burnt plaster. (4) baking soda and dead burnt plaster.

Q40.The correct sequence of thermal stability of the following carbonates is: (1) BaCO3 < CaCO3 < SrCO3 < MgCO3 (2) MgCO3 < CaCO3 < SrCO3 < BaCO3 (3) BaCO3 < SrCO3 < CaCO3 < MgCO3 (4) MgCO3 < SrCO3 < CaCO3 < BaCO3

Q40.The increasing order of reactivity of the following compounds towards aromatic electrophilic substitution reaction is: (1) A < B < C < D (2) B < C < A < D (3) D < B < A < C (4) D < A < C < B

Q40.The reaction that is not involved in the ozone layer depletion mechanism in the stratosphere is ∙ ∙ (1) CH4 + 2O2 →CO2 + 2H2O (2) Cl O (g) + O (g) → Cl (g) + O2 (g) uv ∙ ∙ h(nu) ∙ ∙ (3) (4)−−CF2 Cl2 (g) → Cl (g) + CF2 Cl (g) HOCl (g) → OH (g) + Cl (g)

Q40.Which of the following compounds will show the maximum 'enol' content? (1) CH3COCH2CONH2 (2) CH3COCH2COCH3 (3) CH3COCH2COOC2H5 (4) CH3COCH3

Q40.Correct statements among regarding silicones are: ( 𝑎) They are polymers with hydrophobic character. ( 𝑏) They are biocompatible. ( 𝑐) In general, they have high thermal stability and low dielectric strength. ( 𝑑) Usually, they are resistant to oxidation and used as greases. (1) ( 𝑎) , ( 𝑏) and ( 𝑐) only (2) ( 𝑎) and ( 𝑏) only (3) ( 𝑎) , ( 𝑏) , ( 𝑐) and ( 𝑑) (4) ( 𝑎) , ( 𝑏) and ( 𝑑) only

Q40.Which of the following conditions in drinking water causes methemoglobinemia? (1) > 50 ppm of nitrate (2) > 50 ppm of chloride (3) > 100 ppm of sulphate (4) > 50 ppm of lead

Q40.Which of the following compounds reacts with ethylmagnesium bromide and also decolourizes bromine water solution? JEE Main 2019 (11 Jan Shift 2) JEE Main Previous Year Paper (1) (2) (3) (4)

Q40.The IUPAC name for the following compound is: JEE Main 2019 (12 Apr Shift 2) JEE Main Previous Year Paper (1) 3−methyl −4−1−( methylprop −2−ynyl) −1−heptene (2) 3, 5−dimethyl −4−propylhept −6−en −1−yne (3) 3, 5−dimethyl −4−propyl hept −1−en −6−yne (4) 3−methyl −4−3−( methylprop −1−enhyl) −1−heptyne

Q40.The layer of atmosphere between 10 km to 50 km above the sea level is called as: (1) stratosphere (2) troposphere (3) mesosphere (4) thermosphere

Q40. Which compound (s) out of the following is/are not aromatic? (A) (B) (C) (D) JEE Main 2019 (11 Jan Shift 1) JEE Main Previous Year Paper (1) (B), (C) and (D) (2) (C) and (D) (3) (B) (4) (A) and (C)

Q40.The volume strength of 1M H2O2 is: (Molar mass of H2O2 = 34 g mol−1 ) (1) 5.6 (2) 22.4 (3) 11.2 (4) 16.8

Q40.The electronegativity of aluminum is similar to: (1) Beryllium (2) Boron (3) Carbon (4) Lithium

Q40.The number of pentagons in C60 and trigons (triangles) in white phosphorus, are; (1) 12 and 3 (2) 20 and 4 (3) 20 and 3 (4) 12 and 4

Q40.Diborane B2H6 reacts independently with O2 and H2O to produce, respectively: - (1) HBO2 and H3BO3 (2) H3BO3 and B2O3 (3) B2O3 and [BH4] (4) B2O3 and H3BO3

Q40.A metal on combustion in excess air forms X . X upon hydrolysis with water yields H2O2 and O2 along with another product. The metal is: (1) Na (2) Mg (3) Li (4) Rb

Q40.The correct order of catenation is: (1) Ge > Sn > Si > C (2) C > Sn > Si ≈Ge (3) C > Si > Ge ≈Sn (4) Si > Sn > C > Ge

Q41.The basic structural unit of feldspar, zeolites mica, and asbestos is: (1) SiO4 4 - (2) (3) SiO3 2 - (4) SiO2 JEE Main 2019 (12 Apr Shift 1) JEE Main Previous Year Paper

Q41.Arrange the following amines in the decreasing order of basicity. (1) III > I > II (2) I > III > II (3) III > II > I (4) I > II > III

Q41.A compound of formula A2B3 has the HCP lattice. Which atom forms the HCP lattice and what fraction of the tetrahedral voids are occupied by the other atoms? (1) HCP lattice - B (2) HCP lattice - A 3 2 tetrahedral voids - A 31 tetrahedral voids - B (3) HCP lattice - B (4) HCP lattice - A 3 1 tetrahedral voids - A 23 tetrahedral voids - B JEE Main 2019 (10 Jan Shift 2) JEE Main Previous Year Paper