Fertiliser Technology

121.P₂O₅ percentage in the phosphoric acid produced by wet process is about

1. 10
2. 30
3. 50
4. 70

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122.pH value of soil is maintained at _________ by the addition of fertiliser for optimum growth and health of the plant.

1. 43955
2. 44050
3. 44113
4. 41609

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123.Phosphatic fertiliser is graded based on its _________ content.

1. P₂O3
2. PCl5
3. P₂O₅
4. H3PO₄

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124.Phosphatic fertilisers

1. Are useful during early stage of the plant growth
2. Accelerate fruit formation in later stages of growth
3. Lessen the effect of excessive nitrogen application
4. None of these

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125.Phosphoric acid is produced in wet process from phosphate rock and

1. Dilute H₂SO₄
2. Concentrated H₂SO₄
3. Concentrated NHO₃
4. Concentrated HCl

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126.Phosphorus vapour comprises of

1. P
2. P₂
3. P₃
4. P₄

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127.Pick out the correct statement.

1. Reaction of NH₃ with HNO₃ to produce (NH₄)2NO₃ is endothermic
2. With increase in NH₃/CO₂ ratio, urea yield decreases for a given temperature, pressure and total feed rate
3. Biuret (an intermediate during urea manufacture) is toxic to seeds and animals
4. Both (B) and (C)

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128.Pick out the wrong statement.

1. 'Green acid' is the other name of phosphoric acid produced by the reaction of phosphate rock & sulphuric acid
2. Chemically unreactive nature of red phosphorous is due to its polymeric structure
3. Red phosphorous is the most reactive allotropic form of phosphorous
4. Red phosphorous, which is used in the manufacture of safety matches, is converted into white phosphorous by vaporisation followed by condensation

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129.Plant tranquillisers

1. Hold back stem growth and halt plants at a desired height
2. Cause early maturation of plants
3. Accelerate ripening of food and grain
4. Produce seedless fruit

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130.Potassic fertiliser is graded based on its _________ content.

1. KCl
2. K₂O
3. KNO₃
4. K2SO₄

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