The Pradhan Mantri Gramin Sadak Yojana (PMGSY) was launched to link unconnected villages with durable, all-weather roads. Its goal is to provide better access to markets, schools and hospitals. By improving rural connectivity, the scheme reduces isolation, promotes economic activities and ensures inRead more
The Pradhan Mantri Gramin Sadak Yojana (PMGSY) was launched to link unconnected villages with durable, all-weather roads. Its goal is to provide better access to markets, schools and hospitals. By improving rural connectivity, the scheme reduces isolation, promotes economic activities and ensures inclusive growth and development across India’s rural regions. Correct Option is (c).
Tiger conservation faces persistent challenges despite Project Tiger’s efforts. Rapid deforestation, poaching for illegal trade and shrinking prey base threaten tiger survival. Human encroachment and conflicts further degrade habitats. Although government initiatives and protected reserves exist, inRead more
Tiger conservation faces persistent challenges despite Project Tiger’s efforts. Rapid deforestation, poaching for illegal trade and shrinking prey base threaten tiger survival. Human encroachment and conflicts further degrade habitats. Although government initiatives and protected reserves exist, inconsistent enforcement, habitat fragmentation and inadequate awareness continue to endanger tigers, making their protection an ongoing struggle.
Answer: Aluminium oxide and zinc oxide are amphoteric oxides; they react with dilute hydrochloric acid to form corresponding chlorides and with aqueous sodium hydroxide to form soluble aluminates or zincates. Calcium oxide is a basic oxide; it reacts with dilute hydrochloric acid but not with sodiumRead more
Answer: Aluminium oxide and zinc oxide are amphoteric oxides; they react with dilute hydrochloric acid to form corresponding chlorides and with aqueous sodium hydroxide to form soluble aluminates or zincates. Calcium oxide is a basic oxide; it reacts with dilute hydrochloric acid but not with sodium hydroxide. Sulphur dioxide is an acidic oxide; it does not react with hydrochloric acid but reacts with bases like sodium hydroxide to give sulphites/bisulphites, so statement IV is incorrect here.
Answer: When an iron nail is placed in aqueous copper(II) sulphate (tube P), iron, being more reactive, displaces copper ions; copper is deposited as reddish-brown metal on the nail and iron goes into solution as Fe²⁺. In aqueous silver nitrate (tube Q), iron similarly displaces silver; silver metalRead more
Answer: When an iron nail is placed in aqueous copper(II) sulphate (tube P), iron, being more reactive, displaces copper ions; copper is deposited as reddish-brown metal on the nail and iron goes into solution as Fe²⁺. In aqueous silver nitrate (tube Q), iron similarly displaces silver; silver metal plates the nail producing a silver coating while iron salts form in the solution. Thus both tubes show displacement reactions, with copper and silver metals deposited respectively during the experiment period.
Sodium hydroxide will give the highest pH when equal volumes are dissolved because it is a strong base that dissociates completely to yield a high concentration of hydroxide ions. Magnesium hydroxide, although a base, is sparingly soluble so it produces far fewer OH⁻ ions in solution. Sulphuric acidRead more
Sodium hydroxide will give the highest pH when equal volumes are dissolved because it is a strong base that dissociates completely to yield a high concentration of hydroxide ions. Magnesium hydroxide, although a base, is sparingly soluble so it produces far fewer OH⁻ ions in solution. Sulphuric acid is a strong acid and acetic acid is a weak acid; both produce H⁺ ions and lower pH values, so their solutions will be much less alkaline than NaOH commonly. Correct option – D.
Which of the following statements based describes the aim of the Pradhan Mantri Gramin Sadak Yojana (PMGSY)?
The Pradhan Mantri Gramin Sadak Yojana (PMGSY) was launched to link unconnected villages with durable, all-weather roads. Its goal is to provide better access to markets, schools and hospitals. By improving rural connectivity, the scheme reduces isolation, promotes economic activities and ensures inRead more
The Pradhan Mantri Gramin Sadak Yojana (PMGSY) was launched to link unconnected villages with durable, all-weather roads. Its goal is to provide better access to markets, schools and hospitals. By improving rural connectivity, the scheme reduces isolation, promotes economic activities and ensures inclusive growth and development across India’s rural regions. Correct Option is (c).
See lessProject Tiger was launched in 1973, yet “The Tiger” remains an endangered species in India. Using your understanding of environmental pressures and conservation efforts, explain why tiger conservation continuous to be a challenge.
Tiger conservation faces persistent challenges despite Project Tiger’s efforts. Rapid deforestation, poaching for illegal trade and shrinking prey base threaten tiger survival. Human encroachment and conflicts further degrade habitats. Although government initiatives and protected reserves exist, inRead more
Tiger conservation faces persistent challenges despite Project Tiger’s efforts. Rapid deforestation, poaching for illegal trade and shrinking prey base threaten tiger survival. Human encroachment and conflicts further degrade habitats. Although government initiatives and protected reserves exist, inconsistent enforcement, habitat fragmentation and inadequate awareness continue to endanger tigers, making their protection an ongoing struggle.
See lessFour statements about the reactions of oxides with dilute hydrochloric acid and aqueous sodium hydroxide are listed. I. Aluminium oxide reacts with both dilute hydrochloric acid and aqueous sodium hydroxide. II. Calcium oxide reacts with dilute hydrochloric acid and aqueous sodium hydroxide. III. Zinc oxide reacts with both dilute hydrochloric acid and aqueous sodium hydroxide. IV. Sulphur dioxide does not react with either dilute hydrochloric acid or aqueous sodium hydroxide. Which statements are correct?
Answer: Aluminium oxide and zinc oxide are amphoteric oxides; they react with dilute hydrochloric acid to form corresponding chlorides and with aqueous sodium hydroxide to form soluble aluminates or zincates. Calcium oxide is a basic oxide; it reacts with dilute hydrochloric acid but not with sodiumRead more
Answer: Aluminium oxide and zinc oxide are amphoteric oxides; they react with dilute hydrochloric acid to form corresponding chlorides and with aqueous sodium hydroxide to form soluble aluminates or zincates. Calcium oxide is a basic oxide; it reacts with dilute hydrochloric acid but not with sodium hydroxide. Sulphur dioxide is an acidic oxide; it does not react with hydrochloric acid but reacts with bases like sodium hydroxide to give sulphites/bisulphites, so statement IV is incorrect here.
See lessAn iron nail is added to each of the two test tubes ‘P’ and ‘Q’ containing aqueous copper (II) sulphate, and aqueous silver nitrate respectively. Which of the following observation is correct?
Answer: When an iron nail is placed in aqueous copper(II) sulphate (tube P), iron, being more reactive, displaces copper ions; copper is deposited as reddish-brown metal on the nail and iron goes into solution as Fe²⁺. In aqueous silver nitrate (tube Q), iron similarly displaces silver; silver metalRead more
Answer: When an iron nail is placed in aqueous copper(II) sulphate (tube P), iron, being more reactive, displaces copper ions; copper is deposited as reddish-brown metal on the nail and iron goes into solution as Fe²⁺. In aqueous silver nitrate (tube Q), iron similarly displaces silver; silver metal plates the nail producing a silver coating while iron salts form in the solution. Thus both tubes show displacement reactions, with copper and silver metals deposited respectively during the experiment period.
See lessWhich of the following substances when dissolved in equal volume of water, will have the highest pH value?
Sodium hydroxide will give the highest pH when equal volumes are dissolved because it is a strong base that dissociates completely to yield a high concentration of hydroxide ions. Magnesium hydroxide, although a base, is sparingly soluble so it produces far fewer OH⁻ ions in solution. Sulphuric acidRead more
Sodium hydroxide will give the highest pH when equal volumes are dissolved because it is a strong base that dissociates completely to yield a high concentration of hydroxide ions. Magnesium hydroxide, although a base, is sparingly soluble so it produces far fewer OH⁻ ions in solution. Sulphuric acid is a strong acid and acetic acid is a weak acid; both produce H⁺ ions and lower pH values, so their solutions will be much less alkaline than NaOH commonly. Correct option – D.
See less