One peaceful use of atomic energy is nuclear power generation.

OR

Electromagnetic wave.

2.11.1 → c

2.11.2 → a

2.11.3 → d

2.11.4 → b

True

In the refining of impure copper metal by the process of electrolysis, the mass of the cathode increases.

OR

In the electroplating of gold over silver, potassium gold cyanide (KAu(CN)₂) is commonly used as the electrolyte.

During electrolysis, electricity is carried through the electrolyte by ions.

One reason for the relative chemical inertness of N₂ (nitrogen gas) is its triple bond.

OR

Ammonia (NH₃)

The compound formed by the reaction of atmospheric nitrogen and oxygen as a result of lightning is nitrogen monoxide (NO).

The IUPAC name for CH₃CH=CH₂ is prop-1-ene.

OR

In methane (CH₄), the four valencies of carbon are disposed in a tetrahedral geometry.

It is often used to dissolve oils, resins, and other substances.

Two possible future effects of global warming on the environment are:

• Increased Sea Level Rise: Melting ice caps will lead to coastal flooding and erosion.
• Extreme Weather Events: Global warming will cause more frequent and intense hurricanes, droughts, and heatwaves.

V₁ ​ = 580 cm³ (initial volume)

T₁ ​ = 17°C = 17 + 273.15 = 290.15 K

T₂ ​ = 47°C = 47+273.15 = 320.15K

V₂ ​ = ? (final volume)

Charles's Law: V_1\over T_1 = V_2\over T_2

⇒ V₂ = V_1\over T_1 × T₂

⇒ V₂ = 580\over 290.15 × 320.15 = 638.16cm³

OR

Volume of Gas 1 (V₁) = 4480 mL

Volume of Gas 2 (V₂) = 5600 mL

For Gas 1: n₁ = 4480/22400 = 0.2 moles

For Gas 2: n₂ = 5600/22400 = 0.25 moles

From relation: M_1\over M_2 = n_2\over n_1

⇒ M_1\over M_2 = 0.25\over 0.2  = 5\over 4

The ratio of the molar masses of the two gases is 5:4.

Snell's law

The ratio of the sine of the angle of incidence to the sine of the angle of refraction is a constant, for the light of a given colour and for the given pair of media.

Mathematical form: μ = sin i / sin r

OR

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