Description : Why is Ammonia a good complexing agent?
Last Answer : Ans: Because of lone pair of electrons on N.
Description : Which aerosol deplete ozone layer ?
Last Answer : Ans C.F.C
Description : Write the formula of tear gas .
Last Answer : Ans : CCl3 NO2
Description : Why is helium used in diving apparatus ?
Last Answer : Ans: Because heliun is very low solubility in blood
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 .
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.
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
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
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
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.
Description : Find hybridization and shape i) XeF2 ii) XeO3 iii) XeF4
Last Answer : Ans: i) sp3d, Linear ii) sp3, Pyramidal iii) sp3d2 , Square planar
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
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.
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.
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.
Description : Write shape of following molecules: a) Ammonia b) Phosphorous Pentachloride
Last Answer : Ans: a) Pyramidal b) Trigonal bipyramidal
Description : Ammonia is water soluble. Why?
Last Answer : Ans: It forms hydrogen bond with water.
Description : Why is Nitrogen relatively inert?
Last Answer : Ans: Because of a triple bond with high bond energy.
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.
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.
Description : Potassium Permanganate is used for purifying drinking water, because ________. (1) It is a reducing agent (2) It is an oxidising agent (3) It is a sterilising agent (4) It dissolves the impurities of water
Last Answer : (2) It is an oxidising agent Explanation: Potassium permanganate is a point-of-entry water treatment method that oxidizes dissolved iron, mancianese, and hydrogen sulfide into solid particles that are filtered ... to control iron bacteria growth in wells. It is an oxidant, but a poor disinfectant.
Description : Carbon dioxide is – (1) a reducing agent (2) an oxidising agent (3) a dehydrating agent (4) a bleaching agent
Last Answer : (1) a reducing agent Explanation: A good reducing agent must be able to donate electrons readily. This means that it must not have very much attraction for electrons. Carbon dioxide is just like any other oxide and can be reduced to its respective elements by applied energy.
Description : Potassium Permanganate is used for purifying drinking water, because - (1) it dissolves the impurities of water (2) It is a sterilizing agent (3) It is an oxidising agent (4) It is a reducing agent
Last Answer : (3) It is an oxidising agent Explanation: Potassium permanganate is a point-of-entry treatment method that oxidizes dissolved iron, manganese, and hydrogen sulfide into solid particles that are filtered out of the water.
Description : Potassium Permanganate is used for purifying drinking water, because_________ (1) It is a reducing agent (2) It is an oxidising agent (3) It is a sterilising agent (4) It dissolves the impurities of water
Last Answer : It is an oxidising agent
Description : Carbon dioxide is (1) a reducing agent (2) an oxidising agent (3) a dehydrating agent (4) a bleaching agent
Last Answer : a reducing agent
Description : The strongest oxidizing agent among the following is: (1) Chlorine (2) Iodine (3) Fluorine (4) Oxygen
Last Answer : (3) Fluorine Explanation: An oxidizing agent is a chemical species that removes an electron from another species. Fluorine, having the largest positive value of electrode potential, is the strongest ... all halogens have a tendency to take up electrons and thus act as strong oxidizing agents.
Last Answer : Fluorine
Description : Assertion :- `Cr^(+2)` is a reducing agent and `Mn^(+3)` is oxidising agent. Reason :- `Mn^(+3)` has `d^(5)` configuration.
Last Answer : Assertion :- `Cr^(+2)` is a reducing agent and `Mn^(+3)` is oxidising agent. Reason :- `Mn ... is False. D. If both Assertion & Reason are False.
Description : Assertion :- Nitrous acid `(HNO_(2))` may act as an oxidising agent as well as a reducing agent. Reason :- The oxidation number of Nitrogen remains sa
Last Answer : Assertion :- Nitrous acid `(HNO_(2))` may act as an oxidising agent as well as a reducing agent. ... False. D. If both Assertion & Reason are False.
Description : Assertion :- In the reaction `Zn(s)+cu^(+2)(aq)rarrZn^(+2)(aq)+Cu(s)` `Cu^(+2)` ions act as oxidising agent and Zn atoms act as a reducing agent. Reas
Last Answer : Assertion :- In the reaction `Zn(s)+cu^(+2)(aq)rarrZn^(+2)(aq)+Cu(s)` `Cu^(+2)` ions ... the Reason is False. D. If both Assertion & Reason are False.
Description : In which of the following reaction hydrogen hydrogen is acting as an oxidising agent :-
Last Answer : In which of the following reaction hydrogen hydrogen is acting as an oxidising agent :- A. With ... ammonia D. With sulphur to give hydrogen sulphide
Description : Which one is the oxidising agent in the reaction given below `2CrO_(4)^(2-)+2H^(+)rarrCr_(2)O_(7)^(-2)+H_(2)O`
Last Answer : Which one is the oxidising agent in the reaction given below `2CrO_(4)^(2-)+2H^(+)rarrCr_(2)O_(7)^(-2)+H_(2)O` ... 2)O_(7)^(-2)` C. `Cr^(++)` D. None
Description : The compound that can work both as an oxidising as well as reducing agent is :
Last Answer : The compound that can work both as an oxidising as well as reducing agent is : A. `KMnO_(4)` B. `H_(2)O_(2)` C ... (SO_(4))_(3)` D. `K_(2)Cr_(2)O_(7)`
Description : Which of the following cannot act as an oxidising agent ?
Last Answer : Which of the following cannot act as an oxidising agent ? A. `S^(2-)` B. `Br_(2)` C. `HSO_(4)^(-)` D. `SO_(3)^(2-)`
Description : Hydrogen peroxide acts both as an oxidising and as a reducing agent depending upon the nature of the reacting species. In which of the following cases
Last Answer : Hydrogen peroxide acts both as an oxidising and as a reducing agent depending upon the nature of the reacting species. In ... C. `SO_(3)^(2-)` D. `KI`
Description : Which of the following is the most powerful oxidising agent:
Last Answer : Which of the following is the most powerful oxidising agent: A. `H_(2)SO_(4)` B. `HPO_(3)` C. `H_(3)BO_(3)` D. `H_(3)PO_(4)`
Last Answer : Hydrogen peroxide acts both as an oxidising and as a reducing agent depending upon the nature of the reacting species. In ... ` C. `SO_(3)^(2-)` D. Kl
Description : Assertion: `SO_(3)` acts as an oxidising agent as well as a reducing agent Reason: `SO_(2)` acts as an oxidising as well as a reducing agent
Last Answer : Assertion: `SO_(3)` acts as an oxidising agent as well as a reducing agent Reason: `SO_(2)` acts as an oxidising as well as a reducing agent
Description : Statement -1 : Ozone is a powerful oxidising agent in comparison to `O_(2)`. Statement -1 : `O_(3)` molecules is diamagnetic but `O_(3)^(-)` is parama
Last Answer : Statement -1 : Ozone is a powerful oxidising agent in comparison to `O_(2)`. Statement -1 : `O_(3 ... is diamagnetic but `O_(3)^(-)` is paramagnetic.
Description : `SO_(2)` is a strong reducing agent however it also act as an oxidising agent Which of the following reactions shows its oxidising nature ?
Last Answer : `SO_(2)` is a strong reducing agent however it also act as an oxidising agent Which ... colloidal sulphur D. Turning acidified dichromate paper green
Description : In which of the following reactions, `SO_(2)` acts as an oxidising agent?
Last Answer : In which of the following reactions, `SO_(2)` acts as an oxidising agent? A. `I_(2)+SO_(2)+2H_(2)OrarrSO_(4)^(2 ... 2)(SO_(4))_(3)+K_(2)SO_(4)+H_(2)O`
Description : Which of the following act both as an oxidising as well as reducing agent ?
Last Answer : Which of the following act both as an oxidising as well as reducing agent ? A. `HNO_(2)` B. `H_(2)O_(2)` C. `H_(2)S` D. `SO_(2)`
Description : In which of the following reaction does `SO_(2)` acts as oxidising agent?
Last Answer : In which of the following reaction does `SO_(2)` acts as oxidising agent? A. acidified `KMnO_(4)` B. acidified ... `C_(2)H_(5)OH` D. `H_(2)S`
Description : Hot conc. `H_(2)SO_(4)` acts as moderately strong oxidising agent. It oxidises both metals and non-metals. Which of the following elements is oxidised
Last Answer : Hot conc. `H_(2)SO_(4)` acts as moderately strong oxidising agent. It oxidises both metals and non-metals. Which ... products ? A. Cu B. S C. C D. Zn
Description : Give reasons : A. Ga^(3+) salts are better reducing agent while Tl^(3+) salts are better oxidising agent.
Last Answer : Give reasons : A. Ga3+ salts are better reducing agent while Tl3+ salts are better oxidising agent. B. PbCl4 is less stable than PbCl2
Description : The element used as an oxidising agent?
Last Answer : Chlorine