Chemical Reactions and Equations — Science STD 10 — Question

Which of the following cannot exhibit isomerism?

1. C₄H₁₀
2. C₅H₁₂
3. C₃H₈
4. C₆H₁₄

Galvanisation is a method of protecting iron from rusting by coating with a thin layer of:

1. Gallium.
2. Aluminium.
3. Zinc.
4. Silver.

A metal less reactive and another metal more reactive than hydrogen are:

1. Aaluminium and lead.
2. Iron and magnesium.
3. Copper and tin.
4. Copper and mercury.

When sodium hydrogen carbonate is added to ethanoic acid a gas evolves.
Consider the following statements about the gas evolved?
A. It turns lime water milky.
B. It is evolved with a brisk effervescence.
C. It has a smell of burning sulphur.
D. It is also a by-product of respiration.
The correct statements are:

Match the following with the correct response:

Column A	Column B
(i) Copper is used in electrical appliances	(a) Hydrogen sulphide
(ii) Sodium is very reactive	(b) Good conductor
(iii) Silver is tamished	(c) Graphite
(iv) A non-metal and a good conductor	(d) Stored in kerosene

Washing soda is a

The element which can from an acidic oxide should be the one whose atomic number is:

1. 6.
2. 16.
3. 12.
4. 19.

The elements whose oxides can turn litmus solution red are:

1. Lithium and sodium.
2. Copper and potassium.
3. Carbon and hydrogen.
4. Phosphorus and sulphur.

The firSt member of the alkyne homologous series is: