Acids, Bases and Salts — Science STD 10 — Question

In extraction of copper, the flux used is:

The molecular formulae of some organic compounds are given below. Which of these compounds contains an aldehyde group?

1. C₃H₈O
   
2. C₃H₆O₂
   
3. C₃H₆O
   
4. C₃H₇Cl
   

The number of molecules of water of crystallisation present in washing soda crystals is:

1. Five.
2. Two.
3. Ten.
4. Seven.

A substance added to food containing fats and oils is called:

Which of the following is a combination reaction?

Alloys are homogeneous mixtures of a metal with a metal or nonmetal. Which among the following alloys contain non-metal as one of its constituents?

The atomic number of an element Y is 17. The number of electrons in its ion Y⁻ will be:

Oils on treating with hydrogen in the presence of palladium or nickel catalyst form fats. This is an example of_________.

Which of the following non-metals is a liquid?

1. Carbon.
2. Bromine.
3. Phosphorus.
4. Sulphur.

Which of the following statements about the Modern Periodic Table is correct:

1. It has 18 horizontal rows known as Periods.
2. It has 7 vertical columns known as Periods.
3. It has 18 vertical columns known as Groups.
4. It has 7 horizontal rows known as Groups.