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Given below are the standard electrode potentials of a few half-cells. K+/K =-2.93 V, Ag+/Ag = 0.80 V, Mg2+/Mg = – 2.37 V,Cr3+/Cr = – 0.74 V. What will be the correct order of these metals in increasing reducing power?

Given:K+/K =-2.93 V, Ag+/Ag = 0.80 V, Mg2+/Mg = - 2.37 V,Cr3+/Cr = - 0.74 V. (A) K < Mg < Cr < Ag (B) Mg < K < Cr < Ag... View Article

Which among the following is an odd electron molecule?

(A) NO (B) NO2 (C) ClO2 (D) All of these The Correct Answer is (D) All of these. Solution: NO, NO2 and ClO2 are odd electron molecules... View Article

What weights of P4O6 and P4O10 will be produced by the combustion of 31g of P4 in 32g of oxygen leaving no P4O2?

(A) 55 g and 71 g (B) 17.5 g and 19.5 g (C) 2.75 g and 35.5 g (D) 2.75 g and 29.5 g The Correct Answer is (C) 2.75 g and 35.5 g Solution:... View Article

The total energy of an electron in the first excited state of the hydrogen atom is -3.4 eV. Find out its (i) kinetic energy and (ii) potential energy in this state.

Solution: (i) Kinetic energy (KE) Kinetic energy of electron is -- KE = For the first excited state of the hydrogen atom, n = 2 and Z = 1... View Article

Which of the following compounds does not show geometrical isomerism?

(A) 2-butene (B) 2-pentene (C) 2-methyl propene (D) 2-3-dibromo-2-butene The Correct Answer is (C) 2- Methyl Propane Solution: 2−methyl... View Article

Identify the correct order of reactivity in electrophilic substitution reactions of the following compounds:

Image (A) I > II > III > IV (B) II > I > III > IV (C) III > IV > II > I (D) IV > I > II > III The... View Article

To carry out a given conversion, Arrange the following reagents in correct order.

(1) H+ (2) O3/Zn (3) NaOCl (4) EtONa / EtOH/ Δ Image (A) 1 → 2 → 3 → 4 (B) 1 → 3 → 2 → 4 (C) 2 → 4 → 3 → 1 (D) 4 → 3 → 2 → 1 The... View Article

Which of the following compounds is most reactive towards nucleophilic addition reaction?

(A) PhCOPh (B) CH3CHO (C) PhCOCPH3 (D) CH3COCH3 The Correct Answer is (B) CH3CHO Solution: The aromatic aldehydes and ketones are... View Article

Which of the following compounds has only a primary hydrogen atom?(A) Butane (B) Isobutane (C) Isopentane (D) Cyclohexane

The Correct Answer is (D) Cyclohexane Solution: The compound having only the primary hydrogen atom is cyclohexane. In Cyclohexane, a carbon... View Article

The correct order of acidity of the following elements is i)Phenol (ii)Methyl phenol (iii)Meta-nitro phenol (iv) Para-nitro phenol

(A) Phenol > Meta-nitrophenol > Methyl phenol > Para-nitrophenol (B) Para-nitrophenol > Meta-nitrophenol > Phenol > Methyl... View Article

Rare-earth elements are exhibited by_______.

(A) Atomic numbers 21 to 30. (B) Atomic numbers 39 to 71. (C) Atomic numbers 58 to 71. (D) Atomic numbers 81 to 91. The Correct Answer is (C)... View Article

What do you understand about the term non-stoichiometric hydrides? Do you expect this type of the hydrides to be formed by alkali metals? Justify your answer.

Solution: In non-stoichiometric hydrides, the ratio of the metal to hydrogen is fractional and does not correspond to the actual formula. Their... View Article

The circumference of the second orbit of an atom or ion having single electron is 4 * 10-9 m. The de-Broglie wavelength of electron revolving in this orbit should be

(A) 1 * 10-9 m (B) 2 * 10-9 m (C) 4 * 10-9 m (D) 8 * 10-9 m The Correct Answer is (B) 2 * 10-9 m Solution: As given in the question: The... View Article

What happens to the half-life period for a first-order reaction, if the initial concentration of the reactants is increased?

(A) Increases (B) Decreases (C) Remains unchanged (D) Increases and then decreases. The Correct Answer is (C) Remains unchanged Solution:... View Article

Assertion: P-Nitro phenol is a stronger acid than O-nitro phenol. Reason: Intramolecular hydrogen bonding makes ortho – isomer weaker acid than para – isomer.

(A) Both Assertion and Reason are false. (B) Assertion is true, but Reason is false. (C) Both Assertion and Reason are true. The reason is... View Article

Out of 80 students 45%, students passed in Mathematics and 60% students passed in English. If 35% students failed in both the subjects, how many students passed in both the subjects?

Given that the total number of students = 80 45% students passed in Mathematics = (45/100)80 = 36 students passed in Mathematics 60% students... View Article

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