The value of cosec 10° – √3 sec 10° is equal to :
The value of cosec 10° – √3 sec 10° is equal to : Q. The value of (text{cosec } 10^circ […]
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Identify correct statements from the following : A. Propanal and propanone are functional isomers. B. Ethoxyethane and methoxypropane are metamers. C. But-2-ene shows optical isomerism. D. But-1-ene and but-2-ene are functional isomers. E. Pentane and 2, 2-dimethyl propane are chain isomers. Choose the correct answer from the options given below :
Identify correct statements: Propanal and propanone are functional isomers. Ethoxyethane and methoxypropane are metamers. But-2-ene optical isomerism. But-1-ene and but-2-ene.
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Identify the correct statements. A. Arginine and Tryptophan are essential amino acids. B. Histidine does not contain heterocyclic ring in its structure. C. Proline is a six membered cyclic ring amino acid. D. Glycine does not have chiral centre. E. Cysteine has characteristic feature of side chain as MeS – CH₂ – CH₂ –. Choose the correct answer from the options given below : (A) C and D Only (B) A and D Only (C) C and E Only (D) B and E Only
Identify the correct statements: A. Arginine and Tryptophan are essential amino acids. B. Histidine does not contain heterocyclic ring. C.
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MnO₄²⁻, in acidic medium, disproportionates to : (A) MnO₄⁻ and MnO (B) MnO₄⁻ and MnO₂ (C) Mn2O₇ and MnO₂ (D) Mn2O₇ and MnO
MnO₄²⁻, in acidic medium, disproportionates to : Q. (MnO_4^{2-}), in acidic medium, disproportionates to : (A) (MnO_4^-) and (MnO) (B)
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80 mL of a hydrocarbon on mixing with 264 mL of oxygen in a closed U-tube undergoes complete combustion. The residual gases after cooling to 273 K occupy 224 mL. When the system is treated with KOH solution, the volume decreases to 64 mL. The formula of the hydrocarbon is :
80 mL of a hydrocarbon on mixing with 264 mL of oxygen in a closed U-tube undergoes complete combustion. The
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Given below are two statements : Statement I: When an electric discharge is passed through gaseous hydrogen, the hydrogen molecules dissociate and the energetically excited hydrogen atoms produce electromagnetic radiation of discrete frequencies. Statement II : The frequency of second line of Balmer series obtained from \text{He}^+ is equal to that of first line of Lyman series obtained from hydrogen atom. In the light of the above statements, choose the correct answer from the options given below :
Hydrogen Spectrum Discrete Frequencies and Balmer vs Lyman Series Frequency Comparison Q. Given below are two statements : Statement I:
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Given below are two statements: Statement I: The number of pairs among [SiO₂, CO₂], [SnO, SnO₂], [PbO, PbO₂] and [GeO, GeO₂], which contain oxides that are both amphoteric is 2. Statement II: BF₃ is an electron deficient molecule, can act as a Lewis acid, forms adduct with NH₃ and has a trigonal planar geometry. In the light of the above statements, choose the correct answer from the options given below: A) Both Statement I and Statement II are false B) Statement I is false but Statement II is true C) Both Statement I and Statement II are true D) Statement I is true but Statement II is false
Amphoteric Oxides of Group 14 and Lewis Acid Character of Boron Halides | JEE NEET Chemistry Given below are two
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Which of the following represents the correct trend for the mentioned property? A. F > P > S > B – First Ionization Energy B. Cl > F > S > P – Electron Affinity C. K > Al > Mg > B – Metallic character D. K₂O > Na₂O > MgO > Al₂O₃ – Basic character Choose the correct answer from the options given below : A) B and C only B) A, B and D only C) A and B only D) A, B, C and D
Analysis of Periodic Trends: Ionization Energy, Electron Affinity, and Basic Character Which of the following represents the correct trend for
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In Carius method, 0.75 g of an organic compound gave 1.2 g of barium sulphate, find percentage of sulphur (molar mass 32 g mol⁻¹). Molar mass of barium sulphate is 233 g mol⁻¹. A) 4.55% B) 16.48% C) 10.30% D) 21.97%
In Carius method, 0.75 g of an organic compound gave 1.2 g of barium sulphate, find percentage of sulphur. Q.
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Q. Elements P and Q form two types of non-volatile, non-ionizable compounds PQ and PQ₂. When 1 g of PQ is dissolved in 50 g of solvent ‘A’, ΔT_b was 1.176 K while when 1 g of PQ₂ is dissolved in 50 g of solvent ‘A’, ΔT_b was 0.689 K. (K_b of ‘A’ = 5 K kg mol⁻¹). The molar masses of elements P and Q (in g mol⁻¹) respectively, are : A) 25, 60 B) 60, 25 C) 65, 145 D) 70, 110
JEE Main 2026: Calculation of Atomic Masses of Elements P and Q using Elevation in Boiling Point Q. Elements P