Which of the following halogens does always show oxidation state -1 ?
a. F
b. Cl
c. Br
d. I
1 Answers
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Assertion: A convex mirror always make a virtual image. Reason: The ray always diverge after reflection from the convex mirror.
Correct Answer - A convex mirror always from virtual image becomes ray diverge after reflection.
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`H_3PO_3+HNO_3+(NH_4)_2MoO_4to` Oxidation number of Mo in product is x. `Cr_2O_7^(2-)+H^(+)+NaCl to` Oxidation state of Cr in product is y. `SCN^(-)+M
Correct Answer - 16 x=+6`(NH_4)_3 PMo_12 O_40` y=+6 `CrO_2Cl_2` z=4 `ZtoN^(@)C-S-S-C^(@)N`
2 Answers 1 views
Assertion : The force of tension on a body always act away from the body. Reason: Friction force always opposes the motion of a body.
Correct Answer - C Friction opposes relative motion.
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Among the halogens the one which is oxidised by nitric acid is :
Correct Answer - A `I_(2) - 10HNO_(3) to 2HIO_(3) + 10NO_(2) + 4H_(2)O`
2 Answers 1 views
Which of the following show non-zero multiple oxidation state?
Correct Answer - A::B::D `Zn` have only `2+` or zero oxidation state.
2 Answers 1 views
Comment on the following statements: (a) An exothermic reaction is always thermodynamically spontaneous. Reaction with `DeltaG lt O` always have an eq
Correct Answer - (a) When `DeltaH=-ve "and" TDeltaS`=- ve also `T DeltaS gt DeltaH` then `DeltaG`=+ ve in such case, the reaction will not be spontaneous. (b) `-DeltaG^(@) =2.303 RT...
2 Answers 1 views
In which chemical reaction does carbon exibit variation of oxidation state from -4 to +4 ? Write balanced chemical reaction.
In combustion of methane, Carbon exhibits variation from -4 to +4. The reaction is as follows : CH4 + 2O2 → CO2 + 2H2O In CH4, The oxidation state of carbon is -4 while in...
2 Answers 1 views
(a) Why do transition elements show variable oxidation states? (i) Name the element showing maximum number of oxidation states among the first series
(a) The transition metals have there valence electrons in (n - 1) d and n s orbitals. Since, there is very little energy difference between these orbitals, both energy levels...
2 Answers 2 views
(a) Account for the following : (i) Mn shows the highest oxidation state of +7 with oxygen but with fluorine it shows the highest oxidation state of +
(a) (i) Manganese (Mn) shows highest oxidalion state of +7 with oxygen but with fluorin, it shows the highest of +4 because oxygen has the ability to form multiple bonds...
2 Answers 2 views
(a) Account for the following : (i) Helium is used in diving apparatus. (ii) Fluorine does not exhibit positive oxidation state. (iii) Oxygen shows ca
Correct Answer - (a)(i)Due to small size of fluorine atom, there are strong interelectronic repulsions in the relatively small 2p-orbitals of fluorine and thus, the incoming electron does not experience...
2 Answers 1 views