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

Write shape of following molecules: a) Ammonia b) Phosphorous Pentachloride
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Ans: a) Pyramidal b) Trigonal bipyramidal
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Give reasons: a) Phosphorous pentachloride is unstable. b) Phosphorous trichloride fumes in moisture.

Description : Give reasons: a) Phosphorous pentachloride is unstable. b) Phosphorous trichloride fumes in moisture.

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

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

Why Nitrogen is a gas whereas Phosphorous is a solid?

Description : Why Nitrogen is a gas whereas Phosphorous is a solid?

Last Answer : Ans: Nitrogen molecules have less Vander Waal’s forces of attraction whereas molecular phosphorous has more Vander Waal’s forces of attraction.

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.

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. 

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

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

Last Answer : Ans: i) sp3d, Linear ii) sp3, Pyramidal iii) sp3d2 , Square planar

Write the formula of tear gas .

Description : Write the formula of tear gas . 

Last Answer : Ans : CCl3 NO2 

Which aerosol deplete ozone layer ?

Description : Which aerosol deplete ozone layer ?

Last Answer : Ans C.F.C  

Why is helium used in diving apparatus ?

Description : Why is helium used in diving apparatus ?

Last Answer : Ans: Because heliun is very low solubility in blood  

Why H3 PO3 is dibasic and H3PO4 is tribasic ?

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

Last Answer : Ans In H3PO3 only two replacable hydrogen but inH3PO4 , three hydrogens are replacable .  

Are all the five bonds in PCl5 molecule equivalent ?

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. 

How is the presence of SO2 detected ?

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-

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

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 ?

Last Answer : Ans : In Vapour State sulphurPartly exists as S2 molecule which has two unpaired electrons in the * Orbitals hence exhibit paramagnetic 

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.

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.

Why is Nitrogen relatively inert?

Description : Why is Nitrogen relatively inert?

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

What is produced when phosphorus pentachloride is heated ?

Description : What is produced when phosphorus pentachloride is heated ?

Last Answer : When phosphorus pentachloride is heated, phosphorus trichloride and chlorine are produced.

What are the chemical signals of phosphorus pentachloride ?

Last Answer : : Chemical signal of phosphorus pentachloride PCl5

Which of the following molecules or ions involved in the Nitrogen Cycle do not contain oxygen atom? (1) Nitrite (2) Ammonia (3) Nitrate (4) Laughing gas

Description : Which of the following molecules or ions involved in the Nitrogen Cycle do not contain oxygen atom? (1) Nitrite (2) Ammonia (3) Nitrate (4) Laughing gas

Last Answer : (2) Ammonia

Which of the following molecules would have the smallest molar enthalpy of vaporization? w) Water x) Formaldehyde y) Methane z) Ammonia

Description : Which of the following molecules would have the smallest molar enthalpy of vaporization? w) Water x) Formaldehyde y) Methane z) Ammonia

Last Answer : ANSWER: Y -- METHANE

Suggest the expected shape of the following molecules with reasons a.SO2 b.NH3

Description : Suggest the expected shape of the following molecules with reasons a.SO2 b.NH3

Last Answer : Ans.(a) In SO2 molecule there are three electron pairs .the three electron pairs should acquire trigonal planar arrangement with bond angle 120 ° .Since one of the position is occupied by lone pair the geometry ... to 107 ^0 from 109.5^ 0 and hence the geometry of ammonia is regarded as pryamidal.

A complex of platinum, ammonia and chloride produces four ions per molecules in the solution. The structure consistent with the observation is :

Description : A complex of platinum, ammonia and chloride produces four ions per molecules in the solution. The structure consistent with the observation is :

Last Answer : A complex of platinum, ammonia and chloride produces four ions per molecules in the solution. The structure consistent ... [Pt(NH_(3))_(4)Cl_(2)]Cl`

Write the name of a liquid in which phosphorous dissolves:?

Description : Write the name of a liquid in which phosphorous dissolves:?

Last Answer : Carbondisulphide

Assertion :- Zeolite is shape selective catalyst. Reason :- Size of the pores of the catalyst are such that they can trap only selective molecules.

Description : Assertion :- Zeolite is shape selective catalyst. Reason :- Size of the pores of the catalyst are such that they can trap only selective molecules.

Last Answer : Assertion :- Zeolite is shape selective catalyst. Reason :- Size of the pores of the catalyst are such ... . D. If both Assertion & Reason are False.

What molecules or ions have a linear shape?

Description : What molecules or ions have a linear shape?

Last Answer : For example nitric oxide (NO) and beryllium hydride (BeH2) have linear molecules.

What is the shape of the molecules?

Description : What is the shape of the molecules?

Last Answer : Using a VSEPR theory, the electron bond pairs and lone pairs onthe center atom will help scientists predict the shape of amolecule.

What is true of saturated fatty acids They have the maximum number of hydrogen atoms. They are liquids at room temperature. They have longer molecules with a bent shape. They make up most vegetable fa?

Description : What is true of saturated fatty acids They have the maximum number of hydrogen atoms. They are liquids at room temperature. They have longer molecules with a bent shape. They make up most vegetable fa?

Last Answer : What is the answer ?

The sorting out of molecules according to size and shape may be adapted to protein purification in this technique: (A) Adsorption chromatography (B) Gel filtration chromatography (C) Paper chromatography (D) None of these

Description : The sorting out of molecules according to size and shape may be adapted to protein purification in this technique: (A) Adsorption chromatography (B) Gel filtration chromatography (C) Paper chromatography (D) None of these

Last Answer : Answer : B

What is the shape of molecules SF6 and IF7 ?

Description : What is the shape of molecules SF6 and IF7 ?

Last Answer : SF6 is Octahedral IF7 is pentagonal Bipyramidal

Honey contain glucose and fructose along with some other ingredients, it has greater viscosity due to------? A. hydrogen bonding B. irregular shape of the molecules C. irregular shape of the molecules and strong inter-molecular forces (Answer) D. greater molecular size

Description : Honey contain glucose and fructose along with some other ingredients, it has greater viscosity due to------? A. hydrogen bonding B. irregular shape of the molecules C. irregular shape of the molecules and strong inter-molecular forces (Answer) D. greater molecular size

Last Answer : C. irregular shape of the molecules and strong inter-molecular forces (Answer)

What is Ammonia ? Write the use of ammonia ?

Description : What is Ammonia ? Write the use of ammonia ?

Last Answer : Ammonia is a chemical compound composed mainly of nitrogen and hydrogen. Whose chemical signal is NH3 . It is a gas with a pungent odor. Use of ammonia 1. In the preservation of perishable goods , II. Soda , medicine and rayon industry , 3. As explosives , 4. Used as a reagent in the laboratory.

(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 chemical is used to ripen mangoes artificially? (1) Sulphur Dioxide (2) Nitrous Oxide (3) Calcium Carbide (4) Phosphorous

Description : Which chemical is used to ripen mangoes artificially? (1) Sulphur Dioxide (2) Nitrous Oxide (3) Calcium Carbide (4) Phosphorous

Last Answer : (3) Calcium Carbide Explanation: The chemical widely used for artificially ripening fruits is calcium carbide (CaC2). It is used to ripen about 80 per cent of mangoes in India.

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 nonmetals shows allotropy in the liguid state? (1) Carbon (2) Sulphur (3) Phosphorous (4) Bromine

Description : Which one of the following nonmetals shows allotropy in the liguid state? (1) Carbon (2) Sulphur (3) Phosphorous (4) Bromine

Last Answer : (2) Sulphur Explanation: Sulphur is a non-metal that shows allotropy in the liquid state. If sulphur is heated slowly the changes between the different forms can be observed. These changes are in the ... of cold water, plastic sulphur is formed. This is an elastic, rubber-like form of sulphur.

An example of semiconductor is - (1) German silver (2) Germanium (3) Phosphorous (4) Arsenic

Description : An example of semiconductor is - (1) German silver (2) Germanium (3) Phosphorous (4) Arsenic

Last Answer : (2) Germanium Explanation: Purified germanium is a semiconductor, with appearance most similar to elemental silicon. Like silicon, germanium naturally reacts and forms complexes with oxygen in nature. Unlike silicon, it is too reactive to be found naturally on Earth in the free (native) state.

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}.

The element used in the manufacture of safety matches is – (1) Phosphorous (2) Magnesium (3) Silicon (4) Sulphur

Description : The element used in the manufacture of safety matches is – (1) Phosphorous (2) Magnesium (3) Silicon (4) Sulphur

Last Answer : (1) Phosphorous Explanation: One end of a match is coated with a material that can be ignited by frictional heat generated by striking the match against a suitable surface. The coated end ... ," contains either phosphorus or phosphorus sesquisulfide as the active ingredient and gelatin as a binder.

Which of the following statements is not valid for oxoacids of phosphorus? (1) All oxoacids contain atleast one P = O unit and one P – OH group (2) Orthophosphoric acid is used in the manufacture of triple superphosphate. (3) Hypophosphorous acid is a diprotic acid. (4) All oxoacids contain tetrahedral four coordinated phosphorous

Description : Which of the following statements is not valid for oxoacids of phosphorus? (1) All oxoacids contain atleast one P = O unit and one P – OH group (2) . (3) Hypophosphorous acid is a diprotic acid. (4) All oxoacids contain tetrahedral four coordinated phosphorous

Last Answer : Orthophosphoric acid is used in the manufacture of triple superphosphate.

Which one of the following nonmetals shows allotropy in the liquid state? (1) Carbon (2) Sulphur (3) Phosphorous (4) Bromine

Description : Which one of the following nonmetals shows allotropy in the liquid state? (1) Carbon (2) Sulphur (3) Phosphorous (4) Bromine

Last Answer : Sulphur

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 : 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 element used in the manufacture of safety matches is (1) Phosphorous (2) Magnesium (3) Silicon (4) Sulphur

Description : The element used in the manufacture of safety matches is (1) Phosphorous (2) Magnesium (3) Silicon (4) Sulphur

Last Answer : Phosphorous

An example of semiconductor is (1) German silver (2) Germanium (3) Phosphorous (4) Arsenic

Description : An example of semiconductor is (1) German silver (2) Germanium (3) Phosphorous (4) Arsenic

Last Answer : Germanium

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

Description : 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

Last Answer : Nitrogen, Potassium and Phosphorous