2026 MOCK Questions that I can remember is: 1. Aqua regia is a mixture of concentrated hydrochloric acid and concentrated trioxonitrate v acid in the ratio of 2. Which of the following is the vector of cholera A)housefly B) mosquito C) cockroach 3. Product of decarboxylation of phenylmethanoic acid is 4. Soft solder alloy is lead and 5. Excretory product of earthworm 6. The concentration of salt in brackish water is a)high b)low c) moderate 7. Secondary succession can be caused by a) afforestation b) 8. The apex predator in an aquatic habitat is 9. The middle ear consists of 10. The Sahel savannah is located in which state in Nigeria a) Kaduna b)Kwara c) 11. Which of the following has only one body opening a) euglena b)amoeba c) paramecium d)hydra 12. The non volatile residue from destructive distillation of coal is 13. A substance with lesser permeability than free space is a) ferromagnetic b) 14. Detergents are manufactured with long hydrocarbon chains so as to make them 15. The alkaline derivative used as disinfectant is 16. Secondary growth in older dicot roots occurs in 17. How is silicon iv oxide removed from haematite. > Excellence Academy ⚜️⚜️

Aqua regia is a mixture of concentrated hydrochloric acid ($\text{HCl}$) and concentrated trioxonitrate(V) acid ($\text{HNO}_3$) in the ratio of $\boxed{3:1}$ (HCl:HNO$_3$).

The vector of cholera is primarily contaminated water and food. Among the given options, a housefly (A) can mechanically transmit the bacteria by landing on contaminated feces and then on food.

• A) housefly

Phenylmethanoic acid is also known as benzoic acid ($\text{C}_6\text{H}_5\text{COOH}$). The product of decarboxylation of phenylmethanoic acid is $\boxed{\text{benzene}}$ ($\text{C}_6\text{H}_6$).

Soft solder alloy is lead and $\boxed{\text{tin}}$.

The excretory product of earthworm includes nitrogenous waste (such as urea and ammonia), water, and salts.

The concentration of salt in brackish water is $\boxed{\text{c) moderate}}$. It is saltier than fresh water but less salty than seawater.

Secondary succession can be caused by natural disturbances such as $\boxed{\text{wildfires}}$, $\boxed{\text{floods}}$, $\boxed{\text{logging}}$, or $\boxed{\text{abandoned agricultural fields}}$.

The apex predator in an aquatic habitat varies depending on the specific ecosystem, but examples include $\boxed{\text{sharks}}$, $\boxed{\text{killer whales}}$, or $\boxed{\text{large tuna}}$.

The middle ear consists of the $\boxed{\text{ossicles}}$ (malleus, incus, stapes), the $\boxed{\text{tympanic membrane}}$ (eardrum), and the $\boxed{\text{Eustachian tube}}$.

The Sahel savannah is located in states in northern Nigeria. Among the options, $\boxed{\text{a) Kaduna}}$ is a state that borders the Sahel region. Other states include Borno, Yobe, Jigawa, Kano, Katsina, Sokoto, and Zamfara.

$\boxed{\text{d) Hydra}}$ has only one body opening, which serves as both mouth and anus.

The non-volatile residue from destructive distillation of coal is $\boxed{\text{coke}}$.

A substance with lesser permeability than free space is $\boxed{\text{diamagnetic}}$.

Detergents are manufactured with long hydrocarbon chains so as to make them $\boxed{\text{hydrophobic}}$ (water-repelling) at one end, allowing them to dissolve grease and oil.

The alkaline derivative used as disinfectant is $\boxed{\text{sodium hypochlorite}}$ (bleach).

Secondary growth in older dicot roots occurs in the $\boxed{\text{vascular cambium}}$ and $\boxed{\text{cork cambium}}$.

Silicon(IV) oxide ($\text{SiO}_2$) is removed from haematite (iron ore) during the smelting process in a blast furnace. It reacts with $\boxed{\text{calcium oxide}}$ (lime, $\text{CaO}$), which is added as a flux, to form $\boxed{\text{calcium silicate}}$ ($\text{CaSiO}_3$), which is a molten slag that floats on top of the molten iron and can be tapped off.