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We can test the law of conservation of m...

We can test the law of conservation of mass by the reaction between barium chloride and sodium sulphate.While doing the experiment, one of the precautions you have taken is

A

Reactants should be taken in solid state

B

Cork was not fitted while the reaction is taking place

C

common balance is used to weigh the substances

D

Flask was tilted and swirled for the mixing of two solutions.

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The correct Answer is:
D
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An orbital is designated by certain values of first three quantum numbers (n, l and m) and according to Pauli.s exclusion principle, no two electrons in a atom can have all the for quantum numbers equal. N, l and m denote size, shape and orientation of the orbital. The permissible values of n are 1,2,3.... prop while that of 1 are all possible integral values from 0 to n-n. Orbitals with same values of n and 1 but different values of m (where m can have any integral values from 1 to +1 including zero) are of equal energy and are called degenerate orbitals. However degeneracy is destroyed in homogeneous external magnetic field due to different extent of interaction between the applied field and internal electronic magnet of different orbitals differing in orientations. In octahedral magnetic field external magnetic field as oriented along axes while in tetrahedral field the applied field actas more in between the axes than that on the axes themselves. For 1=0, 1,2,3,...., the states (called sub-shells) are denoted by the symbol s,p,d,f.....respectively. After f, the subshells are denoted by letters alphabetically 1 determines orbital angular motion (L) of electron as L = sqrt(l(l+1))(h)/(2pi) ON the other hand, m determines Z-component of orbital angular momentum as L_(Z) = m((h)/(2pi)) Hund.s rule states that in degenerate orbitals electrons do not pair up unless and until each each orbitals has got an electron with parallesl spins Besides orbital motion,an electron also posses spin-motion. Spin may be clockwise and anticloskwise. Both these spin motions are called two spins states of electrons characterized by spin Q.N (s) : s = +(1)/(2) and = -(1)/(2) respectively The sum of spin Q.N. of all the electrons is called total spin(s) and 2s+1 is called spin multiplicity of the configuration as a whole. The spin angular momentum of an electron is written as L_(s) = sqrt(s(s+1))(h)/(2pi) According to Hund.s rule, the distribution of electron within the various orbitals of a given sub-shell is one which is associated with

A student was given the following substances and was asked to show types of chemical reactions through experiment. Write how he would have done that. Copper sulphate solution, barium chloride solution, ferrous sulphate crystals, Iron nails, calcium oxide, water.

VGS PUBLICATION-BRILLIANT-ATOMS AND MOLECULES-PREVIOUS SUMMATIVE ASSESSMENTS
  1. The correct order in the activity to observe law of conservation of ma...

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  2. Uma: mass is neither created nor destroyed during a chemical reaction ...

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  3. square : Sodium chloride :: Al2(SO4)3: Aluminium sulphate

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  4. David: By transfer of electrons atoms- can attain octet Dravid: By s...

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  5. A given chemical substance always contains the same elements combined ...

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  6. A neutral metal atom becomes dipositive ion by loosing two electrons. ...

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  7. We can test the law of conservation of mass by the reaction between ba...

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  8. The apparatus which is not required in the experiment mentioned in que...

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  9. The molecular mass of a substances is the sum of the atomic masses of ...

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  10. Some symbols of elements are based on their English names, Some other ...

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  11. IF valency of MG is '+2' and valency of Sulphate (SO4) is '-2', then t...

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  12. Homogeneous molecules from the following

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  13. The common name of hydrogen monoxide is

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  14. Valencies of nitrogen and hydrogen and 3 and 1 respectively. The form...

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  15. P: the atmoicity of Oxygen is 3 Q: The formula of ozone is O2

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  16. One of the precautions to be taken in the conduction of experiment on ...

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  17. Ornaments that we wear contains…………

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  18. The latin name of the element Tungsten is

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  19. Molecular formula of Ozone is………..

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