Why Nitrogen is a gas whereas Phosphorous is a solid?

Why Nitrogen is a gas whereas Phosphorous is a solid?
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Ans: Nitrogen molecules have less Vander Waal’s forces of attraction whereas molecular phosphorous has more Vander Waal’s forces of attraction.
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Give reasons: a) Phosphorous pentachloride is unstable. b) Phosphorous trichloride fumes in moisture.

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Last Answer : Ans: a) Because of two longer axial bonds. b) Because it reacts with water and forms hydrochloric acid. 

Write shape of following molecules: a) Ammonia b) Phosphorous Pentachloride

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Nitrogen shows anomalous behaviour in the group. Why?

Description : Nitrogen shows anomalous behaviour in the group. Why?

Last Answer : Ans: i) Small size ii) High electro negativity iii) Absence of vacant d-orbital.

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Description : Why is Nitrogen relatively inert?

Last Answer : Ans: Because of a triple bond with high bond energy. 

Write the formula of tear gas .

Description : Write the formula of tear gas . 

Last Answer : Ans : CCl3 NO2 

Give reasons i) H2O is a liquid but H2S a gas. ii) Ammonia has higher boiling point than phosphine ii) Krypton & xenon make compounds.

Description : Give reasons i) H2O is a liquid but H2S a gas. ii) Ammonia has higher boiling point than phosphine ii) Krypton & xenon make compounds.

Last Answer : Ans: i) Hydrogen bond is found in H2O but not in H2S.  ii) Hydrogen bond is found in NH3 but not in PH3.  iii) Because they have low ionization energy.

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Description : Which aerosol deplete ozone layer ?

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Description : Why is helium used in diving apparatus ?

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Why H3 PO3 is dibasic and H3PO4 is tribasic ?

Description : Why H3 PO3 is dibasic and H3PO4 is tribasic ?

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Description : Are all the five bonds in PCl5 molecule equivalent ? 

Last Answer : Ans – PCl5 has a trigonal bipyramidal structure and the three equatorial p-cl bonds are equivalent . while trhe two axial bonds are different and longer than equatorial bonds. 

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Description : How is the presence of SO2 detected ?

Last Answer : Ans : 1. It has pungent characteristic smell . 2. It decolourises KMn O4 solution 3. It turns acidified K2 Cr2 O7 green 

Why is fluorine stronger Oxidising agent ?

Description : Why is fluorine stronger Oxidising agent ?

Last Answer : Ans: Due to (a) Low enthalpy of dissociation (b) high enthalpy of Hydration of F-

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Description : Halogens have maximum negative electron gain enthalpy in the respective periods in the P. T Why ? 

Last Answer : Ans Due to smallest size and high effective nuclear charge , readily accept one electron  to acquire noble gas electronic configuration  

Which forms of Sulphur show paramagnetic behaviour ?

Description : Which forms of Sulphur show paramagnetic behaviour ?

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Description : Find hybridization and shape i) XeF2 ii) XeO3 iii) XeF4

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How is ammonia prepared? Write chemical reaction involved in the Haber’s process.

Description : How is ammonia prepared? Write chemical reaction involved in the Haber’s process.

Last Answer : i) Ammonia is prepared by the combination of hydrogen and nitrogen in the ratio of 3:1.  ii) The used catalyst is iron oxide. The promotors are potassium and aluminium oxides.  iii) The required conditions are high pressure and moderate temperature.  N2 + 3H2 → 2NH3

Ortho phosphoric acid is triprotic but phosphoric acid is diprotic. Why?

Description : Ortho phosphoric acid is triprotic but phosphoric acid is diprotic. Why?

Last Answer : Ans: Because of their structures ortho phosphoric acid and phosphoric acid have three and two ionisable hydrogen.

Ammonia is water soluble. Why?

Description : Ammonia is water soluble. Why?

Last Answer : Ans: It forms hydrogen bond with water. 

Why is Ammonia a good complexing agent?

Description : Why is Ammonia a good complexing agent?

Last Answer : Ans: Because of lone pair of electrons on N. 

Why is phosphine weaker base than Ammonia?

Description : Why is phosphine weaker base than Ammonia?

Last Answer : Ans: P is bigger than N, therefore lone pair of electrons are less available on P than N. 

AlF3 is a high melting point solid whereas SiF4 is a gas?

Description : AlF3 is a high melting point solid whereas SiF4 is a gas?

Last Answer : Ans.AlF3 is an ionic solid due to large difference in electro negativity of Al and F whereas SiF4 is a covalent compound and hence only weak Vander Waals force exists between the molecules.

(2) Nitrogen, Phosphorous and Sodium Explanation: Fertilizer (or fertiliser) is any organic or inorganic material of natural or synthetic origin (other than liming materials) that is added to a soil to supply one or more plant nutrients essential to the growth of plants. The three elements most needed in common fertilisers are Nitrogen.

Description : (2) Nitrogen, Phosphorous and Sodium Explanation: Fertilizer (or fertiliser) is any organic or inorganic material of natural or synthetic origin (other than liming materials) that is added to a ... essential to the growth of plants. The three elements most needed in common fertilisers are Nitrogen.

Last Answer : Metal are good conductors, because – (1) they contain free electrons (2) the molecules in them are very close to each other (3) the molecules in them collide very freely (4) they contain reflecting surface

Which of the following is caused by the higher concentration of Nitrogen and Phosphorous? (1) Eutrophication (2) Hardness (3) Alkalinity (4) Acidity

Description : Which of the following is caused by the higher concentration of Nitrogen and Phosphorous? (1) Eutrophication (2) Hardness (3) Alkalinity (4) Acidity

Last Answer : (1) Eutrophication Explanation: Higher concentration of Nitrogen and Phosphorus causes Eutrophication.

Which one of the following elements is least likely to be found in commercial fertilizers? (1) Nitrogen (2) Phosphorous (3) Potassium (4) Silicon

Description : Which one of the following elements is least likely to be found in commercial fertilizers? (1) Nitrogen (2) Phosphorous (3) Potassium (4) Silicon

Last Answer : (4) Silicon Explanation: Fertilizers typically provide, in varying proportions: (1) six macronutrients: nitrogen (N), phosphorus (P), potassium (K), calcium (Ca), magnesium (Mg), and sulfur (S); and (ii) eight ... copper (Cu), iron (Fe), manganese (Mn), molybdenum (Mo), zinc (Zn) and nickel {Ni}.

Which of the following is caused by the higher concentration of Nitrogen and Phosphorous ? (1) Eutrophication (2) Hardness (3) Alkalinity (4) Acidity

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Last Answer : Eutrophication

Acid rain is caused due to pollution of atmosphere by (1) oxides of carbon and nitrogen (2) oxides of nitrogen and sulphur (3) oxides of nitrogen and phosphorous (4) None of these

Description : Acid rain is caused due to pollution of atmosphere by (1) oxides of carbon and nitrogen (2) oxides of nitrogen and sulphur (3) oxides of nitrogen and phosphorous (4) None of these

Last Answer : oxides of nitrogen and sulphur

Which one of the following elements is least likely to be found in commercial fertilisers? (1) Nitrogen (2) Phosphorous (3) Potassium (4) Silicon

Description : Which one of the following elements is least likely to be found in commercial fertilisers? (1) Nitrogen (2) Phosphorous (3) Potassium (4) Silicon

Last Answer : Silicon

The three elements most needed in common fertilisers are : (1) Sulphur, Phosphorous and Sodium (2) Nitrogen, Potassium and Phosphorous (3) Phosphorous, Sodium and Nitrogen (4) Calcium, Phosphorous and Potassium

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Pick out the wrong statement. (A) Addition of methane to the furnace atmosphere reduces decarburising by hydrogen (B) Nitrogen in presence of steam decor-burises high carbon steel, whereas hydrocarbon gases carburise the surface of steel at annealing temperatures (C) Active nitrogen (formed by cracking ammonia at the metal surface) cause nitride formation with increase in surface hardness (D) None of these

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In case of nitrogen, `NCl_(3)` is possible but not `NCl_(5)` while in case of phosphorous, `PCl_(5)` as well as `PCl_(5)` are possible. It is due to

Description : In case of nitrogen, `NCl_(3)` is possible but not `NCl_(5)` while in case of phosphorous, `PCl_(5)` as well as `PCl_(5)` are possible. It is due to

Last Answer : In case of nitrogen, `NCl_(3)` is possible but not `NCl_(5)` while in case of phosphorous, ... P in solid while N in gaseous state at room temperature

In case of nitrogen, `NCl_(3)` is possible but not `NCl_(5)` while in case of phosphorous, `PCl_(5)` as well as `PCl_(5)` are possible. It is due to

Description : In case of nitrogen, `NCl_(3)` is possible but not `NCl_(5)` while in case of phosphorous, `PCl_(5)` as well as `PCl_(5)` are possible. It is due to

Last Answer : In case of nitrogen, `NCl_(3)` is possible but not `NCl_(5)` while in case of phosphorous, ... P in solid while N in gaseous state at room temperature

In case of nitrogen, `NCl_(3)` is possible but not `NCl_(5)` while in case of phosphorous, `PCl_(5)` are possible. It is due to

Description : In case of nitrogen, `NCl_(3)` is possible but not `NCl_(5)` while in case of phosphorous, `PCl_(5)` are possible. It is due to

Last Answer : In case of nitrogen, `NCl_(3)` is possible but not `NCl_(5)` while in case of phosphorous, ... In solid while N in gaseous state at room temperature.

Nitrogen (atomic number 7) and Phosphorous (atomic number 15) belong to group 15 of the periodic table. Which of these will be more electro negative? Why?

Description : Nitrogen (atomic number 7) and Phosphorous (atomic number 15) belong to group 15 of the periodic table. Which of these will be more electro negative? Why?

Last Answer : Nitrogen will be more electro negative as it decreases down the group.

Which of the following does not come under the category of ‘primary nutrient' for plant growth? (A) Potassium (B) Nitrogen (C) Phosphorous (D) Sulphur

Description : Which of the following does not come under the category of ‘primary nutrient' for plant growth? (A) Potassium (B) Nitrogen (C) Phosphorous (D) Sulphur

Last Answer : (D) Sulphur

Which nutrient in fertiliser makes the plant stems stronger and increases branching? (A) Nitrogen (B) Phosphorous (C) Potassium (D) Calcium

Description : Which nutrient in fertiliser makes the plant stems stronger and increases branching? (A) Nitrogen (B) Phosphorous (C) Potassium (D) Calcium

Last Answer : (B) Phosphorous

__________ is required more for leafy crops. (A) Nitrogen (B) Phosphorous (C) Potassium (D) Carbon

Description : __________ is required more for leafy crops. (A) Nitrogen (B) Phosphorous (C) Potassium (D) Carbon

Last Answer : (A) Nitrogen

Pick out the wrong statement. (A) Yellow phosphorous which is the most reactive allotropic form of phosphorous is transported under water (B) Apatite is the principal material present in phosphate rock which is chemically Ca10 (PO4 )6 (F, Cl, OH) (C) Urea is more hygroscopic than ammonium nitrate (D) Nitrogen fixation means the process of bringing atmospheric nitrogen into combination i.e. into nitrogen compound fo

Description : Pick out the wrong statement. (A) Yellow phosphorous which is the most reactive allotropic form of phosphorous is transported under water (B) Apatite is the principal material present in ... fixation means the process of bringing atmospheric nitrogen into combination i.e. into nitrogen compound fo

Last Answer : (C) Urea is more hygroscopic than ammonium nitrate

Which of the following is not a measure component necessarily to be present in fertilisers? (A) Nitrogen (B) Potassium (C) Phosphorous (D) Sulphur

Description : Which of the following is not a measure component necessarily to be present in fertilisers? (A) Nitrogen (B) Potassium (C) Phosphorous (D) Sulphur

Last Answer : (D) Sulphur

Presence of nitrogen and phosphorous in waste water discharged into lakes and ponds causes (A) Foaming(B) Odour nuisances(C) Undesirable plant growth(D) Turbidity

Description : Presence of nitrogen and phosphorous in waste water discharged into lakes and ponds causes (A) Foaming (B) Odour nuisances (C) Undesirable plant growth (D) Turbidity

Last Answer : (C) Undesirable plant growth

The three numbers on fertilizer represents the value of the three macro-nutrients used by plants represented as NPK for short. What are they? a. Neon, Phosphorous, Krypton b. Nitrogen, Phosphorus, Potassium c. Neon, Potassium, Krypton d. Neon, Potassium, Phosphorous

Description : The three numbers on fertilizer represents the value of the three macro-nutrients used by plants represented as NPK for short. What are they? a. Neon, Phosphorous, Krypton b. Nitrogen, Phosphorus, Potassium c. Neon, Potassium, Krypton d. Neon, Potassium, Phosphorous

Last Answer : b. Nitrogen, Phosphorus, Potassium

The three numbers on fertilizer represents the value of the three macro-nutrients used by plants represented as NPK for short. What are they? a. Neon, Phosphorous, Krypton b. Nitrogen, Phosphorus, Potassium c. Neon, Potassium, Krypton d. Neon, Potassium, Phosphorous

Description : The three numbers on fertilizer represents the value of the three macro-nutrients used by plants represented as NPK for short. What are they? a. Neon, Phosphorous, Krypton b. Nitrogen, Phosphorus, Potassium c. Neon, Potassium, Krypton d. Neon, Potassium, Phosphorous

Last Answer : b. Nitrogen, Phosphorus, Potassium

6. __________ is a special constituent of chlorophyll without which photosynthesis is not possible. (A) Calcium (B) Nitrogen (C) Phosphorous (D) Hydrogen

Description : 6. __________ is a special constituent of chlorophyll without which photosynthesis is not possible. (A) Calcium (B) Nitrogen (C) Phosphorous (D) Hydrogen

Last Answer : Option B

Silicon crystal can be converted to p-type semi-conductor by doping with (A) Phosphorous (B) Nitrogen (C) Carbon (D) Boron

Description : Silicon crystal can be converted to p-type semi-conductor by doping with (A) Phosphorous (B) Nitrogen (C) Carbon (D) Boron

Last Answer : Option D

The non-metal used in batteries is a) phosphorous b)nitrogen c) carbon d)sulphur

Description : The non-metal used in batteries is a) phosphorous b)nitrogen c) carbon d)sulphur

Last Answer : c) carbon

Which of the following non-metal reacts and catches fire on exposure to air? a) phosphorous b)nitrogen c)sulphur d)hydrogen

Description : Which of the following non-metal reacts and catches fire on exposure to air? a) phosphorous b)nitrogen c)sulphur d)hydrogen

Last Answer : a) phosphorous

Urea is a source of a) Phosphorous b) Nitrogen c) Potassium d) All of the above

Description : Urea is a source of a) Phosphorous b) Nitrogen c) Potassium d) All of the above

Last Answer : b) Nitrogen

Dry ice is the solid form of what gas? w) nitrogen x) oxygen y) helium z) carbon dioxide

Description : Dry ice is the solid form of what gas? w) nitrogen x) oxygen y) helium z) carbon dioxide

Last Answer : ANSWER: Z -- CARBON DIOXIDE

Is nitrogen gas liquid or solid?

Description : Is nitrogen gas liquid or solid?

Last Answer : Nitrogen is a gas at room temperature.

What is dry ice? (1) Solid Carbon dioxide (2) Solid Nitrogen dioxide (3) Solid Sulphur dioxide (4) Solid Water

Description : What is dry ice? (1) Solid Carbon dioxide (2) Solid Nitrogen dioxide (3) Solid Sulphur dioxide (4) Solid Water

Last Answer : (1) Solid Carbon dioxide Explanation: Dry ice, sometimes referred to as "cardice," is the solid form of carbon dioxide. Its advantages include lower temperature than that of water ice and not leaving any residue (other than incidental frost from moisture in the atmosphere).

Dry ice is the solid form of : (1) Air 7 (2) Carbon dioxide (3) Nitrogen (4) Water

Description : Dry ice is the solid form of : (1) Air 7 (2) Carbon dioxide (3) Nitrogen (4) Water

Last Answer : (2) Carbon dioxide Explanation: Dry ice, sometimes referred to as "cardice," is the solid form of carbon dioxide. It is used primarily as a cooling agent. Its advantages include lower tem- ... . It is useful for preserving frozen foods, ice cream, etc., where mechanical cooling is unavailable.