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AIR Spotlight – Rights of Girl Child and Opportunities

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

26 Jan 2022: PIB Summary for UPSC

TABLE OF CONTENTS 1. India and France S&T Cooperation 2. New CCS (Pension) Rules 3. Kathakali Dance 4. 73rd Republic Day 5. Pashchim Lehar... View Article

Which mixture of the solution will lead to the formation of negatively charged colloids of [AgI]- sol?

(A) 50mL of 1M AgNO3 + 50 ml of 2M KI (B) 50mL of 2M AgNO3 + 50 ml of 1.5M KI (C) 50mL of 1M AgNO3 + 50 ml of 1.5M KI (D) 50mL of 0.1M AgNO, +... View Article

29.2% (w/W) HCl stock solution has a density of 1.25 g mL−1. The molecular weight of HCl is 36.5 mol−1. The volume (mL) of stock solution required to prepare a 200 mL solution 0.4 M HCl is:

(A) 6ml (B) 8ml (C) 10ml (D) 12ml The Correct Answer is (B) 8ml Solution: The molarity of stock solution of HCl is According to the... View Article

Assertion: Phenols are more acidic than aliphatic alcohols. Reason: Phenoxides are stabilised by resonance.

(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 the... View Article

Cyanide ion acts as an ambident nucleophile. From which end does it act as a stronger nucleophile in the aqueous medium?

(A) It has the same strength from both the ends (B) It depends on the nature of the alkyl halide (C) It acts as a stronger nucleophile from the... View Article

Which of the following species by definition has ZERO standard Molar enthalpy of formation at 298 K?

(A) Br2 (g) (B) CH4 (g) (C) Cl2 (g) (D) H2O (g) The Correct Answer is (C) Cl2 (g). Cl2 is gas at room temperature. Cl2 (g) is the... View Article

Which factor is most responsible for the increase in boiling points of noble gases from He to Xe?

(A) Monoatomic nature (B) Increase in polarisability (C) Decrease in polarisability (D) Decrease in Ionisation energy The Correct Answer... View Article

Which of the following alkali metals has the highest melting point?

(A) K (B) Li (C) Na (D) Rb The Correct Answer is (B) Li. Solution: Li has the highest melting point among alkali metals. All... View Article

Assertion: Aquatic species are more comfortable in warm water than cold water. Reason: Different gases have different KH values at the same temperature.

(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

In CsCl type structure, the coordination number of Cs+ is Cl- respectively are:

(A) 6,6 (B) 6,8 (C) 8,6 (D) 8,8 The Correct Answer is (D) 8,8 Solution: In Cesium chloride [CsCl], caesium ions form a simple cubic... View Article

Which of the following configurations is associated with the biggest jump between 2nd and 3rd I.E.?

(A) 1s2, 2s2, 2p1 (D) (B) 1s2, 2s2, 2p2 (A) (C) 1s2, 2s2, 2p6, 3s1 (B) (D) 1s2, 2s2, 2p6, 3s2 (C) The Correct Answer is (D) 1s2, 2s2,... View Article

An organic compound contains carbon, hydrogen and oxygen. Its elemental analysis gave C, 38.71% and H, 9.67%. What would be the empirical formula of the compound?

(A) CHO (B) CH2O (C) CH3O (D) CH4O The Correct Answer is (C) CH3O Solution: The empirical formula is to be calculated as:... View Article

Assertion: Both Frenkel and Schottky defects are stoichiometric defects. Reason: Both defects change the density of the crystalline solid.

(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

Lithium forms body centred cubic structure. The length of the side of its unit cell is 351 pm. What will be the Atomic radius of lithium?

(A) 152 pm (B) 175 pm (C) 240 pm (D) 300 pm The Correct Answer is (A) 152 pm. Solution: For body centred cubic (bcc) structure, radius =... View Article

The rate constant for a chemical reaction taking place at 500k is expressed as k = A.e-1000. The activation energy (Ea) of the reaction is:

(A) 100 Kcal (B) 1000 Kcal (C) 10000 Kcal (D) 100000 Kcal The Correct Answer is (B) 1000 Kcal Solution: Explore more such... View Article