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Mesityl oxide is a common name of:

Mesityl oxide is a common name of: a. 3-Methyl cyclohexane carbaldehyde b. 4-Methyl pent-3-en-2-one c. 2,4-Dimethyl pentan-3-one d. 2-Methyl... View Article

Given below are two statements:

Given below are two statements: Statement I: Retardation factor (Rf) can be measured in meter/centimetre Statement II: Rf value of a compound... View Article

Which of the following is the correct structure of tyrosine?

Which of the following is the correct structure of tyrosine? Answer: (c) Fact.... View Article

Given below are two statements:

Given below are two statements: Statement I: Potassium permanganate on heating at 573 K forms potassium manganate. Statement II: Both potassium... View Article

The INCORRECT statement(s) about heavy water is (are)

The INCORRECT statement(s) about heavy water is (are) (A) Used as a moderator in a nuclear reactor (B) Obtained as a by-product in the... View Article

At 363 K, the vapour pressure of A is 21 kPa and that of B is 18 kPa. One mole of A and 2 moles of B are mixed. Assuming that this solution is ideal, the vapour pressure of the mixture is _______ kPa. (Round off to the nearest integer).

Answer: 19 POA = 21 kPa POB = 18 kPa Ptotal = POAXA + POBXB = 21 × ⅓ + 18 × ⅔ = 7 + 12 = 19 kPa... View Article

When 35 mL of 0.15 M lead nitrate solution is mixed with 20 mL of 0.12 M chromic sulphate solution, _________ × 10^–5 moles of lead sulphate precipitate out. (Round off to the nearest integer)

Answer: 525 3Pb(NO3)2 + Cr2(SO4)3 35 ml 20 ml 0.15 M 0.12 M = 5.25 mmol = 2.4 mmol 3PbSO4 ↓ + 2Cr(NO3)3 Moles of PbSO4 = moles of Pb(NO3)2 =... View Article

Ga (atomic mass 70 u) crystallizes in a hexagonal close packed structure. The total number of voids in 0.581 g of Ga is ________ × 10²¹. (Round off to the nearest integer). [Given: N_A = 6.023 × 10²³]

Answer: 15 No. of moles of Ga = 0.581 / 70 No. of atoms of Ga = 0.581 / 70 × NA ∴ Total number of voids = 0.581 / 70 × NA... View Article

In Duma’s method of estimation of nitrogen

In Duma's method of estimation of nitrogen, 0.1840 g of an organic compound gave 30 mL of nitrogen collected at 287 K and 758 mm of Hg pressure.... View Article

Sulphurous acid (H₂SO₃)

Sulphurous acid (H2SO3) has Ka1 = 1.7 × 10–2 and Ka2 = 6.4 × 10–8. The pH of 0.588 M H2SO3 is _________. (Round off to the nearest integer)... View Article

[Ti(H₂O)₆]³⁺ absorbs light of wavelength 498 nm during a d–d transition. The octahedral splitting energy for the above complex is ___________ × 10^–19 J. (Round off to the nearest integer). h = 6.626 × 10^–34 Js; c = 3 × 10⁸ ms^–1.

Answer: 4 Nearest integer = 4 × 10-19 J... View Article

A and B decompose via first-order kinetics

A and B decompose via first-order kinetics with half-lives 54.0 min and 18.0 min respectively. Starting from an equimolar non-reactive mixture of... View Article

The number of orbitals with n = 5

The number of orbitals with n = 5, m1 = +2 is ___________. (Round off to the nearest integer). Answer: 3 For n = 5 l = 0, 1, 2, 3, 4 l = 2 →... View Article

A 5.0 m mold m^–3 aqueous solution of KCl

A 5.0 m mold m–3 aqueous solution of KCl has a conductance of 0.55 mS when measured in a cell of cell constant 1.3 cm–1. The molar... View Article

At 25°C, 50 g of iron reacts with HCl

At 25°C, 50 g of iron reacts with HCl to form FeCl2. The evolved hydrogen gas expands against a constant pressure of 1 bar. The work done by... View Article

The secondary structure of protein is stabilized by:

a. van der Waals forces b. Peptide bond c. Hydrogen bonding d. Glycosidic bond Answer: (c) The secondary structure of protein is stabilized by... View Article

Fex₂ and Fey₃ are known when x and y are:

a. x=Cl, Br, I and y=F, Cl, Br, I b. x=F, Cl, Br, I and y=F, Cl, Br c. x=F, Cl, Br, I and y=F, Cl, Br, I d. x=F, Cl, Br and y =F, Cl, Br, I... View Article

Which of the following is least basic?

a. b. c. d. Answer: (a) Due to higher resonance, lp of N is not available for accepting H+. So, it is least basic.... View Article

In the below reaction, the reagent “A” is:

In the below reaction, the reagent “A” is: a. NaBH4, H3O+ b. HCl, Zn-Hg c. Alkaline KMnO4, H+ d. LiAlH4 Answer: (c)... View Article

The greenhouse gas/es is (are)

1. Carbon dioxide 2. Oxygen 3. Water vapour 4. Methane Choose the most appropriate answer from the options given below: a. (1) and (2) only... View Article