Sujeet Kumar

1. Choose the correct option. Question A.Identify nuclear fusion reaction Answer:Among the given options, reactions (i) and (ii) represent nuclear fusion reactions wherein lighter nuclei combine to form a heavy nucleus. Question B.The missing particle from the nuclear reaction isAnswer:(A)  Question C. decays with half-life of 5.27 years to produce . What is the decay constant for … Read more

1. Choose the correct option Question A.The equilibrium, H2O(l) ⇌ H+(aq) + OH–(aq) isa. dynamicb. staticc. physicald. mechanicalAnswer:a. dynamic Question B.For the equilibrium, A ⇌ 2B + Heat, the number of ‘A’ molecules increases ifa. volume is increasedb. temperature is increasedc. catalyst is addedd. concentration of B is decreasedAnswer:b. temperature is increased Question C.For the equilibrium Cl2(g) + 2NO(g) ⇌ … Read more

1. Choose the correct option. Question A.The size of colloidal particles lies betweena. 10-10 m and 10-9 mb. 10-9 m and 10-6 mc. 10-6 m and 10-4 md. 10-5 m and 10-2 mAnswer:b. 10-9 m and 10-6 m Question B.Gum in water is an example ofa. true solutionb. suspensionc. lyophilic sold. lyophobic solAnswer:c. lyophilic sol Question C.In Haber process of production of ammonia K2O is … Read more

1. Select and write the most appropriate alternatives from the given choices. Question A.The unit of viscosity isa. dynesb. newtonc. gramd. poiseAnswer:d. poise Question B.Which of the following is true for 2 moles of an ideal gas?a. PV = nRTb. PV = RTc. PV = 2RTd. PV = TAnswer:c. PV = 2RT Question C.Intermolecular forces … Read more

1. Choose the correct option. Question A.Which of the following is not an allotrope of carbon?a. buckyballb. diamondc. graphited. emeraldAnswer:d. emerald Question B.………… is inorganic graphite.a. boraxb. diboranec. boron nitrided. colemaniteAnswer:c. boron nitride Question C.Haber’s process is used for the preparation of ………….a. HNO3b. NH3c. NH2CONH2d. NH4OHAnswer:b. NH3 Question D.Thallium shows a different oxidation state … Read more

1. Explain the following Question A.Hydrogen shows similarity with alkali metals as well as halogens.Answer: Hence, hydrogen shows similarity with alkali metals as well as halogens. Question B.Standard reduction potential of alkali metals have high negative values.Answer: Hence, standard reduction potentials of alkali metals have high negative values. Question C.Alkaline earth metals have low values … Read more

1. Explain the following Question A.The elements Li, B, Be and N have the electronegativities 1.0, 2.0, 1.5, and 3.0, respectively on the Pauling scale.Answer: Hence, the elements Li, B, Be and N have the electronegativities 1.0, 2.0, 1.5, and 3.0, respectively on the Pauling scale. Question B.The atomic radii of Cl, I and Br … Read more

1. Choose the most correct option Question A.Oxidation numbers of Cl atoms marked as Cla and Clb in CaOCl2 (bleaching powder) are a. zero in eachb. -1 in Cla and +1 in Clbc. +1 in Cla and -1 in Clbd. 1 in eachAnswer:b. -1 in Cla and +1 in Clb Question B.Which of the following is not an example of redox … Read more

Chapter 5 Chemical Bonding 1. Select and write the most appropriate alternatives from the given choices. Question A.Which molecule is linear?a. SO3b. CO2c. H2Sd. Cl2OAnswer:b. CO2 Question B.When the following bond types are listed in decreasing order of strength (strongest first). Which is the correct order?a. covalent > hydrogen > van der waalsb. covalent > … Read more

1. Choose the correct option. Question A.The energy difference between the shells goes on ……….. when moved away from the nucleus.a. Increasingb. decreasingc. equalizingd. staticAnswer:b. decreasing Question B.The value of Plank’s constant isa. 6.626× 10-34 Jsb. 6.023× 10-24 Jsc. 1.667 × 10-28 Jsd. 6.626× 10-28 JsAnswer:a. 6.626× 10-34 Js Question C.p-orbitals are ……. in shape.a. sphericalb. dumbbellc. double dumbbelld. diagonalAnswer:b. … Read more