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Eco-Sensitive Zones (ESZ)

The Supreme Court of India, in April 2023, revised its 2022 mandate, which required the establishment of an eco-sensitive zone of at least 1... View Article

02 July 2021: The Hindu Analysis

UPSC Current Affairs Preparation: The Hindu Analysis Watch expert analysis of ‘The Hindu’ dated 02nd Jul 2021. Important news and views to boost... View Article

AIR Spotlight – GST: One Nation, One Tax

AIR Spotlight is an insightful programme featured daily on the All India Radio Newsonair. In this program, many eminent panelists discuss issues... View Article

The mass of Li³⁺ is 8.33 times the mass of a proton. If Li³⁺ and proton are accelerated through the same potential difference, then the ratio of de Broglie’s wavelength of Li³⁺ to proton is x ×10^–1. Find x

Answer: 2 m (Li3+) = 8.33 × m p+ (given) Debroglie's wavelength (λ) = h / p KE = ½ mv2 Multiplying by m on both sides m. KE = ½ mv2 2m.... View Article

4.5 g of a solute having molar mass of 90 g/mol is dissolved in water to make a 250 mL solution. Calculate the molarity of the solution.

Answer: 0.2 WB (given weight of solute) = 4.5 g MB (Molar mass of solute) = 90 g/mol VS (Volume of solution) = 250 mL = 250 / 1000 L = 1/4 L... View Article

Among the following compounds, how many are amphoteric in nature?

Be(OH)2, BeO, Ba(OH)2, Sr(OH)2 Answer: 2 The oxide and hydroxide of Be are amphoteric. Hence BeO and Be(OH)2 is amphoteric. Ba(OH)2 and Sr(OH)2... View Article

What is the coordination number in Body Centered Cubic (BCC) arrangement of identical particles?

Answer: 8 The easiest way is to look at the atom at the body center. It lies at the center of the body diagonal and touches the eight corner... View Article

9.45g of CH₂ClCOOH is dissolved in 500 mL of H₂O solution and the depression in freezing point of the solution is 0.5°C. Find the percentage dissociation.

(Kf)H2O = 1.86K kg mole-1. Answer: 34.4% CH2Cl COOH CH2ClCOO- + H+ Initial 1 0 0 Dissociated α α α Left (1-α) α α i = final moles /... View Article

If the dissociation constant of [Cu(NH₃)₄]²⁺ is X × 10¹². Determine X.

Cu2+ + NH3 ⇌ [Cu(NH3)]2+ K1 = 104 [Cu(NH3)]2+ + NH3 ⇌ [Cu(NH3)]2+ K2 = 1.58 × 103 [Cu(NH3)2]2+ + NH3 ⇌ [Cu(NH3)3]2+ K3 = 5 × 102 [Cu(NH3)3]2+ +... View Article

For a chemical reaction, K_eq is 100 at 300K, the value of ΔG^o is –xR Joule at 1 atm pressure. Find the value of x. (Use ln 10 = 2.3)

Answer: 1382 Given: Keq= 100 at 300K and ΔGo = –xR Joule ΔGo = -RTln(Keq) = -2.303RTlog(Keq) = -1381.8R Therefore, x = 1381.8 or 1382... View Article

Calculate the time taken in seconds for 40% completion of a first order reaction, if its rate constant is 3.3× 10^-4sec^-1.

Answer: 1518 = 30 x 103 x 0.506 = 1518 sec... View Article

S₈ + bOH^– → cS^2- + sS₂O^2-₃ + H₂O. Find the value of c.

Answer: 4 Let us look at the half reactions i.e. oxidation and reduction separately. Oxidation: S8 → S2O2-3 S8 + 24OH- → 4S2O2-3 + 12H2O... View Article

For the given reaction at equilibrium, moles of Cl₂(g) is equal to the moles of Cl(g) and the equilibrium pressure is 1atm. If K_p of this reaction is x ×10^–1, find x.

Cl2(g) ⇌ 2Cl(g) Answer: 5 According to the question: Cl2 ⇌ 2Cl [Ptotal = 1 atm]. Moles of Cl2 = Moles of Cl (at equilibrium). Given: Kp = x... View Article

Archives

Eco-Sensitive Zones (ESZ)

02 July 2021: The Hindu Analysis

AIR Spotlight – GST: One Nation, One Tax

The mass of Li³⁺ is 8.33 times the mass of a proton. If Li³⁺ and proton are accelerated through the same potential difference, then the ratio of de Broglie’s wavelength of Li³⁺ to proton is x ×10^–1. Find x

4.5 g of a solute having molar mass of 90 g/mol is dissolved in water to make a 250 mL solution. Calculate the molarity of the solution.

Among the following compounds, how many are amphoteric in nature?

What is the coordination number in Body Centered Cubic (BCC) arrangement of identical particles?

9.45g of CH₂ClCOOH is dissolved in 500 mL of H₂O solution and the depression in freezing point of the solution is 0.5°C. Find the percentage dissociation.

If the dissociation constant of [Cu(NH₃)₄]²⁺ is X × 10¹². Determine X.

For a chemical reaction, K_eq is 100 at 300K, the value of ΔG^o is –xR Joule at 1 atm pressure. Find the value of x. (Use ln 10 = 2.3)

Calculate the time taken in seconds for 40% completion of a first order reaction, if its rate constant is 3.3× 10^-4sec^-1.

S₈ + bOH^– → cS^2- + sS₂O^2-₃ + H₂O. Find the value of c.

For the given reaction at equilibrium, moles of Cl₂(g) is equal to the moles of Cl(g) and the equilibrium pressure is 1atm. If K_p of this reaction is x ×10^–1, find x.

Arrange Mg, Al, Si, P and S in the correct order of their ionisation potentials.

The composition of gun metal is:

The slope of the straight line given in the following diagram for adsorption is:

Identify X, Y, Z in the given reaction sequence.

E^o_M²⁺_{/ M} has a positive value for which of the following elements of 3d transition series?

In the given reactions,

S-1: Colourless cupric metaborate is converted into cuprous metaborate in a luminous flame.

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