HSC Science (Computer Science) 11th Standard - Maharashtra State Board Question Bank Solutions

Answer in one sentence:

Name the element that shows the simplest emission spectrum.

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Which of the following methods can be used to separate two compounds with different solubilities in the same solvent?

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Which of the following techniques is used for the separation of glycerol from soap in the soap industry?

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A mixture of acetone and benzene can be separated by the following method:

Why is a condenser used in distillation process?

What will happen if the upper outlet of the condenser is connected to the tap instead of the lower outlet?

What is the difference between simple distillation and fractional distillation?

Define Distillation

Explain inadequacies octet rule with respect to

1. Incomplete octet
2. Expanded octet

Answer in one sentence:

Write an equation for Freundlich adsorption isotherm.

Explain graphically Freundlich adsorption isotherm.

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\[\ce{^60_27CO}\] decays with a half-life of 5.27 years to produce \[\ce{^60_28Ni}\]. What is the decay constant for such radioactive disintegration?

Write relation between decay constant of a radioelement and its half-life.

Derive the relationship between half-life and decay constant of a radioelement.

Decay constant of ¹⁹⁷Hg is 0.017 h^-1. What is its half-life?

The half-life of ¹⁸F is 110 minutes. What fraction of ¹⁸F sample decays in 20 minutes?

The half-life of ³⁵S is 87.8 d. What percentage of ³⁵S sample remains after 180 d?

The half-life of ⁶⁷Ga is 78 h. How long will it take to decay 12% of the sample of Ga?

0.5 g sample of ²⁰¹Tl decays to 0.0788 g in 8 days. What is its half-life?

65% of ¹¹¹In sample decays in 4.2 d. What is its half-life?