CBSE Class X – Science Chemistry + Biology + Physics Exam (Full Syllabus)

When hydrogen sulphide gas is passed through a blue solution of copper sulphate, a black precipitate of copper sulphide is obtained and the sulphuric acid. So formed remains in the solution.

Baking powder is a mixture of sodium hydrogen carbonate and tartaric acid NaHCO₃ + H+ → CO₂ + H₂O + Sodium salt (from tartaric acid) of acid Carbon dioxide (CO₂) produced during reaction can cause bread or cake to rise and makes Baking powder, tartaric acid neutralises the salt and cake does not taste bitter.

Due to the weaker bond of gallium atoms their melting point is also low.

The major constituent of the liquefied petroleum gas is butane.

The element with electronic confguration 2, 8 has octet confguration, so it must be an inert gas, i.e., neon, which is placed in group 18.

The process of digestion begins in the mouth. The mouth contains a digestive enzyme, salivary amylase. This enzyme breaks the starch molecules in the food, into maltose. The absence of amylase in the saliva thus afects the breakdown of starch into simpler sugar molecules.

Budding in which a bud arises from a particular region on a parent body. And after detaching from the parent body the bud grows into a new independent individual

Menopause is a natural process at the age of 40s or 50s in case of human females. Menopause occurs when a women has not have her menstrual cycle for 12 consecutive months and can no longer become pregnant naturally.

Vegetative propagation is a method of asexual reproduction in some higher plants in which a new plant develops from the vegetative parts of a plant such as a root, stem or leaf.

During sexual reproduction, both mother and father pass their genes to their children, thus determining their traits; or Attribute features

The wings of an insect and a bird have distinct structures but they carry out the same function of fying. Therefore, they are analogous organs

Ammeter is a device used for measuring electric current in amperes

one horse power is determined as almost 746 Watt in standard calculations. It derived its name from the following context: One horsepower is the amount of power used by a horse to lift a 550 pounds heavy object from a depth of 1 foot in one second. This power when converted to SI system gives 746 Watts.

Flemings Right hand rule gives the direction of the induced current. Stretch the thumb, forefinger and middle finger of right hand so that they are perpendicular to each other.

Soft iron inside the current carrying solenoid act as an electromagnet.