Explanation

• Sublimation is the transition of a substance from the solid to the gas phase without going through the liquid phase.
• This means that a solid changes directly into a gas, without first melting into a liquid.

Explanation

• Distillation is a process that involves boiling a liquid and then collecting the condensed steam.
• Which is free from many impurities, resulting in a purified liquid.
• This process is commonly used to purify water, alcohol, and other liquids.

Explanation

The incorrect statement about non-metals is: Non-metals are solid at room temperature.

Non-metals are typically:

• Non-metal are gases
• Non-metals have low melting and boiling point
• Non-metal are poor conductor of heat and electricity
• Non-metal are dull and soft

Explanation

• Liquids can be converted into solids by cooling, a process known as freezing or solidification.
• As the temperature decreases, the particles of the liquid slow down and come together, forming a solid.

Explanation

• Carbonic anhydrase is a enzyme that catalyzes the conversion of carbon dioxide and water into carbonic acid, and it is considered one of the most efficient enzymes known, with a rate enhancement of up to 10^6 (1 million) times compared to the uncatalyzed reaction.
• Carbonic anhydrase is an excellent example of an enzyme that has evolved to optimize its catalytic activity, and its active site is specifically designed to bind substrates and facilitate the reaction.

Explanation

The d-block elements are located in the periodic table between the s-block and p-block elements and are characterized by the filling of the d subshell. These elements are known as transition elements or transition metals.

Explanation

When water freezes, it forms an open hexagonal structure due to hydrogen bonding.

This structure makes ice less dense than liquid water, which is why ice floats on water.

Explanation

Calcium (Ca) typically has an oxidation number of +2.

Oxygen (O) typically has an oxidation number of -2.

In the chlorite ion (ClO2-), let the oxidation number of Cl be 'x'.

The total charge of the chlorite ion is -1.

So, the equation becomes: x + 2*(-2) = -1

Solving for x: x - 4 = -1, therefore x = +3

Since there are two chlorite ions in the compound, the overall oxidation number of Cl in Ca(ClO2)2 is +3.

Explanation

Acetic acid can be prepared by the hydrolysis of: Methyl cyanide
(Methyl cyanide, also known as acetonitrile, upon hydrolysis yields acetic acid.)

Explanation

The decomposition reaction is: 

ZnCO 3(s)→ZnO(s)+CO 2(g) One mole of ZnCO₃ produces one mole of CO₂, so 10 moles will produce 10 moles of CO₂.

The molar mass of CO₂ is: 

CO₂=12+(16×2)=44g/mol Therefore, 

10 moles of CO₂=10×44=440g.