Chemistry-
General
Easy

Question

Soda ash is chemically:

  1. Na subscript 2 CO subscript 3 times straight H subscript 2 straight O
  2. NaOH
  3. NaHCO subscript 3
  4. Na subscript 2 CO subscript 3 text  (anhydrous)  end text

The correct answer is: Na subscript 2 CO subscript 3 text  (anhydrous)  end text

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The van der Waals' constant' a' for different gases have been given as :

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If l subscript 1 end subscript comma m subscript 1 end subscript comma n subscript 1 end subscriptand l subscript 2 end subscript comma m subscript 2 end subscript comma n subscript 2 end subscript blankare text d.c.´s end text text  of  end text stack O A with rightwards arrow on top comma stack O B with rightwards arrow on top such that  where ‘O’ is the origin, then the d.c.’s of the internal bisector of the angle  are

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The electronic configurations of the element A,B, and C are :given below.

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The electronic configurations of the element A,B, and C are :given below.

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The electronic configurations of the element A,B, and C are :given below.

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chemistry-General
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Lewis concept of covalency of an element involvesoctetrule.Lateronitwasfoundthatmanyelementsin their compounds, e.g., B e F subscript 2 end subscript comma B F subscript 3 end subscript etc. have incompleteoctetwhereasP C l subscript 5 end subscript comma S F subscript 6 end subscript et c.haveexpandedoctet. This classicaconcept also failed inpredictingthegeometryof molecules. Modem concept of covalence was pro­ posed in terms of valence bond theory. Hybridizationconcept along with valence bond theory successfullexplained the geometryofvariousmoleculesbutfailedin many molecules ThebondangleN O subscript 2 end subscript superscript plus end superscript comma N O subscript 2 end subscriptandN O subscript 2 end subscript superscript minus end superscriptare,respectively:

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Many bond angles can be explained by either electronegativity or size arguments. Molecules with larger difference in electronegativity values between central and outer atoms have smaller bond ang les. As the size of outer atom increases, the angle increases. The size of central atom can also be used to determine the bond angles in the series.

Consider the following hydrides and arrange them in increasing order of bond ang les:
I) N H subscript 3 end subscript
II) P H subscript 3 end subscript
III) A s H subscript 3 end subscript
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Many bond angles can be explained by either electronegativity or size arguments. Molecules with larger difference in electronegativity values between central and outer atoms have smaller bond ang les. As the size of outer atom increases, the angle increases. The size of central atom can also be used to determine the bond angles in the series.

Consider the following hydrides and arrange them in increasing order of bond ang les:
I) N H subscript 3 end subscript
II) P H subscript 3 end subscript
III) A s H subscript 3 end subscript
IV) S b H subscript 3 end subscript

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