Here we are providing MCQ Questions for Class 11 Chemistry Chapter 4 Chemical Bonding and Molecular Structure. There questions are prepared by subject experts and are very useful for your exams. Practicing these questions will help you to score better marks in the exam. MCQ Questions for Class 11 Chapter 4 Chemical Bonding and Molecular … Read more
Q.1. Periodic classification of elements is used to examine the(a) periodic trends in physical properties of elements(b) periodic trends in chemical properties of elements(c) Both (a) and (b)(d) None of the above Answer (c) Periodic classification of elements follow a logical consequence of electronic configuration of atoms which is used to examine the physical and … Read more
Q.1. Number of protons, neutrons and electrons in the element 89X231 is(a) 89, 89, 242 (b) 89, 142, 89(c) 89, 71, 89 (d) 89, 231, 89 Answer (b) Number of p = number of e– = 89 and neutrons 231 – 89 = 142. Q.2. Atoms with same mass number but different atomic numbers are … Read more
Q.1. Which one of the following sets of compounds correctly illustrate the law of reciprocal proportions?(a) P2O3, PH3, H2O (b) P2O5, PH3, H2O(c) N2O5, NH3, H2O (d) N2O, NH3, H2O Answer (a) In law of reciprocal proportions, the two elements combining with the third element, must combine with each other in the same ratio or … Read more
Q.1. Identify the oxidizing agent and the reducing agent in the following reaction H2S + HNO3 → NO + S + H2O Answer Answer: In the reaction HNO3 is an oxidizing agent since it itself gets reduced from +5 to +2. While H2S is an reducing agent since it itself gets oxidized from –2 to … Read more
Q.1. Why is 2-ethylanthraquinone preferred in the commercial production of H2O2? Answer Answer: It gets regenerated during the reaction by hydrogenation of 2–ethylanthrahydroquinone. Q.2. Which would have higher electrical conductivity H2O or D2O? Answer Answer: Water due its greater degree of dissociation (pKH2O = 13.997 pKD2O = 14.869) . Q.3. Give an example to show … Read more
Q.1. Why does a piece of burning magnesium ribbon continues to burn in sulphur dioxide ? Answer Answer: This is because magnesium has high affinity to combine with oxygen of SO2 to form MgO and S. 2Mg + SO2 → 2MgO + S Q.2. What is the function of adding gypsum to clinker cement ? … Read more
Q.1. Name the element of group 13 which forms only covalent compounds. Answer Answer: B forms only covalent compounds. Q.2. Explain why silicon shows a higher covalency than carbon? Answer Answer: Si because of the presence of vacant d–orbitals can show a covalency upto six while C because of the absence of d– orbitals cannot … Read more
Q.1. What type of isomerism is shown by butane and isobutane? Answer Answer: Chain or nuclear isomerism. Q.2. Write the metamer of diethyl ether. What is its IUPAC name ? Answer Answer: 1-Methoxypropane, CH3OCH2CH2CH3 or 2-methoxypropane, CH3-OCH(CH3)2. Q.3. What is the functional group of (i) an aldehyde and (ii) a nitro compound? Answer Answer: (i) … Read more
Q.1. What is halogen carrier? Give one example. Answer Answer: A halogen compound used during halogenation of benzene is called halogen carrier e.g. FeCl3. Q.2. Arrange the following in the increasing order of C–C bond length C2H6, C2H4, C2H2 Answer Answer: C2H2 < C2H4 < C2H6 Q.3. Name the products formed when an ethereal solution … Read more
Q.1. Name the different regions of the atmosphere alongwith their altitudes. Answer Answer: Troposphere (0-10 km, stratosphere (10-50 km), mesosphere (50-85 km), thermosphere (85 – 500 km). Q.2. In what regions of the atmosphere, the temperature increases with altitude and in which regions it decreases? Answer Answer: Temperature increases with altitude in stratosphere and thermosphere … Read more
Here you can freely download NCERT Solutions for Class 11 , We have listed all the chapters PDF’s. All the Solutions available here are latest. There is no Login, nor Sign Up, neither Redirects, just click the downloading link, you can view your PDF and download accordingly. Latest NCERT Solutions Class 11 Physics Free PDF Download … Read more
Bohr developed a model for hydrogen atom and hydrogen like one–electron species (hydrogenic species). He applied quantum theory in considering the energy of an electron bound to the nucleus. Important postulates An atom consists of a dense nucleus situated at the centre with the electron revolving around it in circular orbits without emitting any energy. The force … Read more
When a black body is heated, it emits thermal radiations of different wavelengths or frequency. To explain these radiations, Max Planck put forward a theory known as Planck’s quantum theory. The main points of quantum theory are i) Substances radiate or absorb energy discontinuously in the form of small packets or bundles of energy. ii) … Read more
If the atom gains energy the electron passes from a lower energy level to a higher energy level, energy is absorbed that means a specific wave length is absorbed. Consequently, a dark line will appear in the spectrum. This dark line constitutes the absorption spectrum. If the atom loses energy, the electron passes from higher … Read more
A wave is a sort of disturbance which originates from some vibrating source and travels outward as a continuous sequence of alternating crests and troughs. Every wave has five important characteristics, namely, wavelength , frequency , velocity (c), wave number and amplitude (a). Ordinary light rays, X–rays, α–rays, etc. are called electromagnetic radiations because similar … Read more
We know the fundamental particles of the atom. Now let us see, how these particles are arranged in an atom to suggest a model of the atom. Thomson’s Model: J.J. Thomson, in 1904, proposed that there was an equal and opposite positive charge enveloping the electrons in a matrix. This model is called the plum … Read more
Topics to be covered: Atomic structure; Rutherford Model; Spectrum of hydrogen atom; Bohr model; de Broglie relations, Uncertainty principle, Quantum model; Electronic configuration of elements ( upto to atomic number 36); Aufbau principle, Pauli’s exclusion principle and Hund’s rule, shapes of s,p, and d orbitals. Content: Dalton’s Atomic Theory Atomic Models Some Important Characteristics of … Read more
