Carbon and its Compounds — Science STD 10 — Question

An alkyne has seventy five carbon atoms in its molecule. The number of hydrogen atoms in its molecule will be:

1. 150
2. 148
3. 152
4. 146

ZnCO3 → ZnO + CO2 What type of reaction is this?

A salt is dissolved in water and the pH of this salt solution is measured with a universal indicator paper. If the pH of solution is less than 7, the salt is most likely to be:

How many Mn atoms are found in the following compound?
2MnO₄

Substances that prevent oxidation are called as:

IUPAC name of first member of homologous series of ketones is:

An element X forms an oxide X₂O₃. In which group of Mendeleev's periodic table is this element placed?

1. Group II.
2. Group III.
3. Group V.
4. Group VIII.

What is the Law of Conservation of Mass?

Which of the following element does not lose an electron easily?

1. Na.
2. F.
3. Mg.
4. Al.

Plaster of Paris is prepared by heating one of the following to a temperature of 100°C. This is:

1. CaSO₃.2H₂O
2. CaCl₂.2H₂O
3. CaCO₃.2H₂O
4. CaSO₄.2H₂O