Maharashtra State Board
- b) How are Brazil and India different from each other in terms of location? (i) India is located in the northern and eastern hemispheres of the Earth. It is located in the southern part of the Asian continent. ii) Th... 2
- a) What problems did Brazil and India face after independence? Q2 There were many common problems that Brazil and India faced after independence. Some of them are: management – The resources of both the cou... 1
- Q 1) Are the sentences right or wrong. ? Rewrite the wrong ones (a) Brazil is mainly located in the Southern Hemisphere. Answer: Right (b) Tropic of Capricorn passes through the middle of India. Answer: W... 1
- Identify from the following the isoelectronic species: Ne, O2-, Na+ OR Ar, Cl2-, K⊕ Atoms and ions having the same number of electrons are isoelectronic Species and No. of electrons Ne =10 O²⁻ 8 + 2 = 10 Na⁺ 11 − 1 = 10 Ar 1... 1
- Give the names of quantum numbers. The four quantum numbers are principal quantum number (n), azimuthal or subsidiary quantum number (l), magnetic quantum number (m_l), and el... 1
- State Heisenberg uncertainty principle. Heisenberg's uncertainty principle states that “It is impossible to determine simultaneously, the exact position and exact momentum (or velo... 1
- Name the element that shows simplest emission spectrum. Hydrogen shows the simplest emmission spectrum 2
- If an element ‘X’ has mass number 11 and it has 6 neutrons, then write its representation. The representation of the given element is ¹¹₅X 1
- 4. Match the following : Element No. of Neutron a. ⁴⁰₁₈AR iv. 22 b. ¹⁴₆C iii. 8 c. ⁴⁰₁₉K ii. 21 d. ¹⁴₇N i. 7 1
- Complete the following information about the isotopes in the chart given below : Substance Mass Number Number of Protons Neutrons Electrons Carbon-14 14 6 8 6 Lead-208 208 82 126 82 Chlorine-35 35 17 18 17 Uranium-238 238... 1
- Make the pairs: neutrons six electrons Answer:: ‘A’ ‘B’ a. Neutrons iv. Chadwick b. p-orbital i. six electrons c. charge on electron ii. -1.6×10⁻¹⁹ C d. Lyman series iii. Ultravio... 1
- Principal Quantum number describes a. shape of orbital b) size of the orbital 2
- “No two electrons in the same atoms can have identical set of four quantum numbers”. This statement is known as - a. Pauli’s exclusion principle 2
- p-orbitals are....... in shape. a. spherical b. dumb bell c. double dumbell d. diagonal b. dumb bell 2
- The value of Plank’s constant is - A) 6.626 × 10⁻³⁴Js 2
- The energy difference between the shells goes on ........... when moved away from the nucleus. b) decreasing 2
- When seen from below, the blades of a ceiling fan are seen to be revolving anticlockwise and their speed is decreasing. Correct answer is (B) Angular velocity downwards, angular acceleration upwards. 1
- O. Why do we see bands separating in column chromatography? we see bands separating in column chromatography Because , In column chromatography, the solutes get adsorbed on the stationary phase, they... 1
- N. Name the different types of Chromatography and explain the principles underlying them. There are two types of chromatography namely: Liquid chromatography ⇒ separate ions that are dissolved insolvent Gas chromatography ⇒ separa... 2
- M. List the properties of solvents which make them suitable for crystallization The properties of solvents which make them suitable for crystallization are The compound to be crystallized should be least or sparingly sol... 1
- L. Define a. Solvent extraction b. Distillation. Solvent extraction : it is ultimately a process of partitioning between two immiscible solvents, and for its optimization, it is necessary t... 2
- K. What is the difference between simple distillation and fractional distillation? Distillation Fraction distillation Simple distillation is used to separate liquids with boiling point gaps of at least 50 degrees. Fractiona... 1
- J. Define : a. Stationary phase b. Saturated solution Statioanry phase - Stationary phase and mobile phase arr terms related to chromatography. Phase on which the materials to be separated are s... 1
- I. Why should spotting of mixture be done above the level of mobile phase ? In thin-layer chromatography( TLC), the sample mixture should be spotted above the solvent level. It is because if the mixture gets in conta... 1