Question

guy's tell me these questions are from which sample paper....
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Answer 1

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Q. ❶ Ans.

1. The chemical equation in which the number of atoms of the different elements are equal in the reactant side ( L.H.S ) and product side ( R.H.S. ) is called as the balanced chemical equation .
2. We need to balance a chemical equation because of the law of conservation of mass which states that " In any reaction the total mass of the elements in the reactants is the same as that of the total mass of each of the respective elements in the products " .

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Q. ❷ Ans. The ' x ' element is ' Sulphur ' ( 16 ) .

1. The electronic configuration of Sulphur is ' 2 , 8 , 6 ' so the valency will be ' 2 ' .
2. When Sulphur reacts with Hydrogen ➙ H₂S . Dot structure is in the attachment.
3. Nature ↦Sulphur is a multivalent non-metal, abundant, tasteless and and odorless. In its native form sulphur is a yellow crystalline solid. In nature it occurs as the pure element or as sulfide and sulfate minerals.

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Q. ❸ Ans.

1. Modern periodic law states that ' The elements are the periodic function to their atomic number ' .

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Q. ❹ Ans.

1. No , because the star light coming from the star bends towards the normal as it travels from rarer medium to denser medium .
2. Due to this the apparent position of the star is slightly higher than the actual position of the star .

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