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

Calcium phosphate Ca₃(PO₄)₂  is a basic salt, as it is formed by the combination of a weak acid (phosphoric acid) and a slightly stronger base (calcium hydroxide)

Atomic number of X is 10, so this must be Ne (Neon), a noble or inert gas. This gas has complete octane configuration.

Only 0.03% of atmospheric air contains carbon in the form of carbon dioxide. The natural concentration of  carbon monoxide  in  the air  is around 0.2 parts per million (ppm).

Catenation is the property of self-linking of an element by which an atom combines with the other atoms of the same element to form long chains

Na and Mg belong to the sameperiod, whereas Na and K are in the same group.In a group from top to bottom, the atomic radius increases, whereas it decreases in a period from left to right. Hence, the order would be K ɳ Na ɳ Mg and K ɳ Ca ɳ Mg

Atomic number 14 (electronic confguration of 2,8,4) is for silicon element, which is a metalloid and exhibit properties of both metal and non-metal

The blood leaving the tissues becomes richer in carbon dioxide. When the oxygenated blood passes through the capillaries of the tissue.

The maleness of a child is determined by the presence of the Y chromo-some in the zygote inherited from the father.

The two versions of a trait which are brought in by the male and female gametes are situated on copies of the same chromosome. Each parent contributes one copy of the gene for a particular trait.

Less scattering leads to the Sun appearing white as only a little of the blue and violet colour is scattered

Current is inversely proportional to the resistance for the same potential. So higher resistance would allow less current to pass through its which is shown by R3 as I3 < I2 < I1∴ R3 >R2 > R1

With the help of magnetic field, one can find the presence of magnetic field in a region by observing its deflection.