Carbon and its Compounds — Science STD 10 — Question

Calamine ore can be converted into zinc oxide by the process of:

1. Dehydration.
2. Roasting.
3. Calcination.
4. Sulphonation.

One of the following contains a double bond as well as single bonds. This is:

A solution reacts with zinc granules to give a gas which burns with a 'pop' sound. The solution contains:

1. Mg(OH)₂
2. Na₂CO₃
3. NaCl
4. HCl

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

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

Which one of the following is non-crystalline or amorphous?

Element X reacts with element Y to form a compound Z. During the formation of compound Z, atoms of X lose one electron each whereas atoms of Y gain one electron each. Which of the following property is not shown by compound Z?

1. High melting point.
2. Low melting point.
3. Occurrence as solid.
4. Conduction of electricity in molten state.

One of the following molecular formulae represents a ketone. This formula is:

1. C₅H₁₂O
   
2. C₆H₁₂O₂
   
3. C₆H₁₄O
   
4. C₆H₁₂O
   

Soap doesn't work well with woollen garments because :
A. It is basic in nature and woollen garments have acidic dyes.
B. It is acidic in nature and woollen garments have basic dyes.

Which of the following metals exist in their native state in nature?

1. Cu
2. Au
3. Zn
4. Ag

1. 1 and 2
2. 2 and 3
3. 2 and 4
4. 3 and 4

In which of the following chemical reaction takes place?