CBSE Class X – Science Chemistry Exam (Full Syllabus)

Mention whether it is physical or chemical changes : Heating of an iron rod to red hot

Sate the reactions exothermic or endothermic in nature: Dissolution of sodium hydroxide in water

Dilute hydrochloric acid is added to granulated zinc taken in a test tube. The following observations are recorded. Designate the accurate observation:

Which of the subsequent does show an oxidation reaction

Barium chloride on reacting with ammonium sulphate forms barium sulphate and ammonium chloride. Which of the following correctly represents the type of reaction involved?

1. Displacement reaction
2. Precipitation reaction
3. Combination reaction
4. Double displacement reaction

Baking soda is a blend of:

What will take place when the solution of an acid is blend with the solution of a base in a test tube?

1. The temperature of the solution increases
2. The temperature of the solution decreases
3. The temperature of the solution remains the same
4. Salt formation takes place

Which of the subsequent is/are true when HCl(g) is passed through water?

1. It does not ionise in the solution as it is a covalent compound
2. It ionises in the solution
3. It gives both hydrogen and hydroxyl ions in the solution.
4. It forms hydronium ion in the solution due to the combination of hydrogen ion with water molecule

Antacid are

The pH of pure water is

Which of the following gives the accurate increasing order of the atomic radii of O, F and N?

Which is not true about the noble gases?

Which among the following has larger size of atoms?

The atomic number of an element is 20, its valency is

Arrange the following elements in the order of their increasing non-metallic character Li, O, C, Be and F

Which of the following statements about graphite and diamond is true?

The formula of cyclopentane

The compounds formed by the sharing of electron pairs between two atoms.

The molecular formula of the fourth member of alkane series.

The next homologue of C₄H₆

An aluminium strip is retained immersed in freshly prepared ferrous sulphate solution taken in a test tube, the change state is that:

Generally, metals react with acids to give salt and hydrogen gas. Which of the following acids does not give hydrogen gas on reacting with metals (except Mn and Mg)?

An element A is mushy and can be cut with a knife. This is very reactive to air and cannot be kept in open air. It reacts vigorously with water. Identify the element from the following:

Why should we not throw small pieces of sodium into a sink in the laboratory? Because of

The Most malleable and ductile metal