CBSE Class X – Science Chemistry Exam (Full Syllabus)

When hydrogen sulphide gas is passed through a blue solution of copper sulphate, the colour of the solution fades and a black precipitate is obtained.Write the chemical name of the black precipitate formed.

Which of the following is not a physical change?

Strong heating of ferrous sulphate leads to the formation of a brown solid and two gases. This reaction can be designated as:

You are given the solution of lead nitrate. In order to obtain a yellow precipitate you should blend with it a solution of:

Three beakers labelled as A, B and C, each containing 25 ml of water, were taken. A small amount of NaOH, anhydrous CuSO4 and NaCl were added to the beakers A, B and C respectively. It was observed that there was an increase in the temperature of the solutions contained in beakers A and B, whereas in the case of beaker C, the temperature of the solution fell. Which one of the following statement(s) is (are) correct?

1. In beakers A and B, exothermic process has occurred.
2. In beakers A and B, endothermic process has occurred
3. In beaker C, exothermic process has occurred
4. In beaker C, endothermic process has occurred.

Which of the following gives the exact increasing order of acid strength?

Which among the following is not a base?

Common salt other than being used in kitchen can also be used as the raw material for  making:

1. Washing soda
2. Bleaching powder
3. Baking soda
4. Slaked lime

Sodium hydrogen carbonate when added to acetic acid evolves a gas. Which of the following declaration are true about the gas evolved?

1. It turns lime water milky
2. It extinguishes a burning splinter.
3. It dissolves in a solution of sodium hydroxide.
4. It has a pungent odour

The source of lactic acid is

Where would you establish the element with electronic confguration 2, ǫ in the modern periodic table?

An element which is a crucial constituent of all organic compounds belongs to:

The electronic confgurations of three elements X, Y and Z are: X : 2 Y : 2, 8, 7 Z : 2, 8, 2 Which of the following is true regarding these elements?

What type of oxide would Eka-aluminium form?

Arrange these elements in decreasing order of their atomic radii

The electronic configuration of an element is found to be 2, 4. How many bonds can one carbon atom form in a compound?

The ability of an atom to form bonds with other atoms of the same element.

The strong electrostatic interactions between ions formed by the transfer of electrons

The name of the fourth member of alkane series.

The next homologue of C₂H₄

Which among the following Declaration is incorrect for magnesium metal?

Shwetha took three beakers A, B and C containing zinc sulphate, silver sulphate and iron (II) sulphate solutions respectively. Copper pieces were added to each beaker. The solution will Become visible blue in the case of:

In the given reaction, Al₂O₃ + NaOH → …X… + H₂O. What is element X?

2 ml each of conc. HCl, HNO₃, and a mixture of conc. HCl and conc. HNO3 in the ratio of 3:1 were taken in test tubes labelled as : A, B and C. A small piece of metal was put in each test tube. No change occurred in test tubes A and B but the metal got dissolved in test tube C. The metal could be:

1. AI
2. Au
3. Cu
4. Pt

The Lustrous non-metal