HSC Science (General) ११ वीं कक्षा - Maharashtra State Board Question Bank Solutions for Chemistry

Choose the correct option.

Oxidation number of oxygen in superoxide is

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Which of the following halogens does always show oxidation state -1?

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The process \[\ce{SO2->S2Cl2}\] is

In which chemical reaction does carbon exhibit variation of oxidation state from - 4 to + 4? Write a balanced chemical reaction.

Give an example of mirror nuclei.

Name the most stable nuclide known.

In which reaction does nitrogen exhibit variation of oxidation state from –3 to +5?

Calculate the oxidation number of the underlined atom.

H₂SO₄

Calculate the oxidation number of the underlined atom.

HNO₃

Calculate the oxidation number of the underlined atom.

H₃PO₃

Calculate the oxidation number of the underlined atom.

K₂C₂O₄

Write pairs of isotones and one pair of mirror nuclei from the following:

\[\ce{^10_5B, ^12_6C, ^27_13Al, ^11_6C, ^28_14S}\]

Calculate the oxidation number of the underlined atom.

H₂S₄O₆

Represent graphically log₁₀ (activity/dps) versus t/s. What is its slope?

Calculate the oxidation number of the underlined atom.

Cr₂O₇²⁻

Calculate the oxidation number of the underlined atom.

NaH₂PO₄

Justify that the following reaction is redox reaction; identify the species oxidized/reduced, which acts as an oxidant and which acts as a reductant.

\[\ce{I2_{(aq)} + 2S2O^{2-}_{3(aq)}->S4O^{2-}_{6(aq)} + 2I^-_{ (aq)}}\]

The atomic mass of \[\ce{^32_16S}\] is 31.97 u. If masses of neutron and H atom are 1.0087 u and 1.0078 u respectively. What is the mass defect?

Justify that the following reaction is redox reaction; identify the species oxidized/reduced, which acts as an oxidant and which acts as a reductant.

\[\ce{HF_{(aq)} + {OH}^-_{ (aq)}->H2O_{(l)} + {F}^ -_{ (aq)}}\]

Find the number of α and β-particles emitted in the process \[\ce{^222_86Rn -> ^214_84Po}\].