HSC Science (Computer Science) 12th Standard Board Exam - Maharashtra State Board Question Bank Solutions

Give two reactions showing oxidising property of concentrated H₂SO_4. Write the structures of HClO₃ and HClO₄.

A gas is allowed to expand in a well insulated container against a constant external pressure of 2.5 Bar from an initial volume of 2.5L to a final volume of 4.5L The change in internal energy, ΔU of the gas will be ______.

The coordination number of cobalt in the complex [Co(en)₂Br₂]Cl₂ is ______.

Observe the following and answer the questions given below:

Name the type of halogen derivative.

Observe the following and answer the question given below:

Comment on the bond length of C-X bond in it.

Observe the following and answer the question given below:

Can react by S_N1 mechanism? Justify your answer.

Arrange the halogen acids in the decreasing order of acidic strength.

Explain reactivity of halogens towards oxygen.

What are the allotropes of oxygen?

Name the nanoparticles used a catalyst in hydrogenation reaction.

Rewrite the following reaction by filling the blanks:

\[\ce{CH3 - CH - CH2 + HBr -> \underset{(major)}{\underline{}\underline{}\underline{}\underline{}} + \underset{(minor)}{\underline{}\underline{}\underline{}\underline{}}}\]

Rewrite the following reaction by filling the blanks:

\[\ce{CH3 - CH = CH2 + HBr ->[peroxide] \underset{(major)}{\underline{}\underline{}\underline{}\underline{}} + \underset{(minor)}{\underline{}\underline{}\underline{}\underline{}}}\]

Rewrite the following reaction by filling the blanks:

\[\ce{(CH3)2C = CHCH3 + HBr ->[peroxide] \underset{(major)}{\underline{}\underline{}\underline{}\underline{}} + \underset{(minor)}{\underline{}\underline{}\underline{}\underline{}}}\]

The number of octahedral sites per sphere in ccp structure is ______.

Formulate the galvanic cell in which the following reaction occurs.

2Al(S) + 3Cu²⁺(aq) → 2Al³⁺(aq) + 3Cu(S)

Derive integrated rate law for zero order reaction.

What is the effect of denaturation on the structure of proteins?

Calculate the pH of a buffer solution containing 0.1 M CH₃COOH and 0.05 M CH₃COONa. Dissociation constant of CH₃COOH is 1.8 × 10^-5 at 25°C.

Give two reactions in which acidified K₂Cr₂O₇ is used as an oxidizing agent.

A voltaic cell consisting of Fe²⁺(aq)| Fe(s) and Bi³⁺(aq)| Bi(s) electrodes is constructed. When the circuit is closed, mass of Fe electrode decreases and that of Bi electrode increases.

1. Write cell formula .
2. Which electrode is cathode and which electrode is anode?
3. Write electrode reactions and overall cell reaction.