Explanation: In carbon family stability +2 oxidation state increases on moving down the group in the periodic table with an increase in atomic number due to screening effect.

Which of the following statements is correct with respect to the effect of temperature on rate of respiration?

Rate of respiration doubles for every 10o rise in temperature, thus temperature co-efficient (Q10) for respiration is 2.

Which of the following statements is false with respect to group 14 elements?

Statement is wrong because, due to inert pair effect, the stability of lower oxidation state (+2) increases down the group while stability of higher oxidation state (+4) decreases donw the group.

Which of the following is correct with reference to the rise in temperature?

The correct answer is The temperature rises with increasing depth. Temperature Variation: The temperature inside the earth increases with increase in depth.

Which is the correct statement for group 14 elements?

(i) For carbon atoms, bonding is strong due to their small size. Thus maximum catenation From carbon to tin in group 14 elements, the atom size increases, thus result in low bonding and decreased catention.

Which property is correct for carbon?

Hint: We know that carbon is the chemical element with the symbol C and atomic number 6. It belongs to group 14 on the periodic table, it is nonmetallic and tetravalent. The most common isotope of carbon contains 6 protons and 6 neutrons, and has an atomic mass of 12.0107 amu.

What is the optimal temperature for enzymes functioning in the human body?

Optimum Temperature Each enzyme has a temperature range in which a maximal rate of reaction is achieved. This maximum is known as the temperature optimum of the enzyme. The optimum temperature for most enzymes is about 98.6 degrees Fahrenheit (37 degrees Celsius).

Which of the following is a characteristic of the group 14 elements?

Group 14 is the carbon family. The five members are carbon, silicon, germanium, tin, and lead. All of these elements have four electrons in their outermost energy level. Of the Group 14 elements, only carbon and silicon form bonds as nonmetals (sharing electrons covalently).

Which of the following causes the temperature of a substance to remain constant?

latent heat
It is due to the latent heat as the heat supplied to increase the temperature of the substance is used up to transform the state of matter of the substance hence the temperature stays constant. Hence the temperature remains constant as all the heat is used up and no external heat is released or absorbed.

What is the most electronegative element in group 14?

carbon
All the given elements are present in group 14. On moving down a group from top to bottom, the electronegativity decreases (as the atomic radii increases). Therefore, carbon is most electronegative.

Which of the following is not correct about group 14 elements?

Carbon and silicon are non-metals, germanium is a metalloid, whereas tin and lead are soft metals. Melting points and boiling points of group 14 elements are much higher than those of corresponding elements of group 13.

What are two carbon properties?

(i) Catenation – The property of carbon element due to which its atoms can join one another to form long carbon chains is called catenation. It means carbon atoms have the tendency to link with one another through covalent bonds to form chains and rings. (ii) Tetravalency – Carbon has a valency of four.

What are 3 characteristics of carbon that make it a unique element?

Carbon’s characteristics include its ability to bond with oxygen, hydrogen, nitrogen, phosphorus and sulfur. Carbon biochemical compounds are essential to all life on the planet.

What are the optimal conditions for enzymes?

There is a certain temperature at which an enzyme’s catalytic activity is at its greatest (see graph). This optimal temperature is usually around human body temperature (37.5 oC) for the enzymes in human cells.

Which temperature range would the enzyme not be effective?

While higher temperatures do increase the activity of enzymes and the rate of reactions, enzymes are still proteins, and as with all proteins, temperatures above 104 degrees Fahrenheit, 40 degrees Celsius, will start to break them down.

What are 5 physical properties of carbon?

The Physical properties of Carbon are the characteristics that can be observed without changing the substance into another substance. Physical properties are usually those that can be observed using our senses such as color, luster, freezing point, boiling point, melting point, density, hardness and odor.

Is Group 14 metal or nonmetal?

carbon group
Group 14 is called the carbon group. This group contains two metalloids: silicon and germanium. Carbon is a nonmetal, and the remaining elements in this group are metals.

Why does the temperature remain constant during melting and boiling?

Answer: The temperature of a substance remains constant at its melting and boiling points until all the substance melts or boils because, the heat supplied is continuously used up in changing the state of the substance by overcoming the forces of attraction between the particles.

What is the transition from a solid to a gas called?

Key Points. Sublimation is an endothermic phase transition in which a solid evaporates to a gas.

Which of the following is most electropositive element?

Cesium
Cesium is the most electropositive element.