Question 1 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b19cbf273b230584979b38.JPG' /> Name the reaction involved for the above reacting compounds.

Question 2 :
The name of the compound $CH_3 — CH_2 — CHO$ is

Question 4 :
An electric heater of resistance 8 Ω draws 15 A from the service mains 2 hours. Calculate the rate at which heat is developed in the heater.

Question 5 :
A copper wire has diameter 0.5 mm and resistivity of $1.6×10^{-8}Ω$m. What will be the length of this wire to make its resistance 10 Ω?

Question 6 :
Prenatal sex determination has been prohibited by law. Is it TRUE or FALSE?

Question 8 :
The developing embryo will also generate waste substances which can be removed by transferring them through:-

Question 9 :
Name the element which shows maximum valency among the elements with atomic number 3 to 9, based on the following trends of the periodic table: (a) Electropositive nature of the element(s) increases down the group and decreases across the period. (b) Electronegativity of the element decreases down the group and increases across the period. (c) Atomic size increases down the group and decreases across a period (left to right). (d) Metallic character increases down the group and decreases across a period.

Question 10 :
Identify the period number of the element whose atomic number is 10.