CBSE Class X – Science Chemistry Exam (Full Syllabus)

State the reactions are exothermic or endothermic in nature: Decomposition of ferrous sulphate

Solid calcium oxide reacts vigorously with water to form calcium hydroxide, accompanied by liberation of heat. This process is called slaking of lime. Calcium hydroxide dissolves in water to form a solution called lime water. Which among the following is (are) true about slaking of lime and the solution formed?

1. It is an endothermic reaction
2. It is an exothermic reaction.
3. The pH of the resulting solution will be more than seven.
4. The pH of the resulting solution will be less than seven

Which of the following is not a physical change?

Which of the following gases can be used for the storage of fresh sample of an oil for a long duration?

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

Which of the following substances will not give carbon dioxide on treatment with dilute acid?

Which among the following is not a base?

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

Antacid are

On strong heating, blue coloured copper sulphate crystals turns

Which of the specified elements A, B, C, D and E with atomic number 2, 3, 7, 10 and 30 respectively affiliated to the same period?

Which of the following are the characteristics of isotopes of an element?

1. Isotopes of an element have the same atomic masses.
2. Isotopes of an element have the same atomic number
3. Isotopes of an element show the same physical properties.
4. Isotopes of an element show the same chemical properties.

Three elements B, Si and Ge are:

Arrange these elements in increasing order of their atomic radii

Arrange these elements in increasing 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?

What is denatured alcohol?

Which of the following is the molecular formula of cyclobutane?

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

The molecular formula of the fourth member of alkane series.

Metals are solid in nature. Which one of the Subsequent metals is found in liquid condition at room temperature?

Non-metals are not lustrous. Which of the following non-metals is lustrous?

Although metals form basic oxides, which of the subsequent metals form an amphoteric oxide?

When calcium metal is added to water, the gas evolved does not catch fire but the same gas evolved on adding potassium metal to water catches fire.

Metal that can be cut by knife