Acids, Bases and Salts — Science STD 10 — Question

What type of oxide would Eka-aluminium form?

1. EO₃
2. E₃O2
3. E₂O₃
4. EO

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

Carbon compounds:
i. are good conductors of electricity.
ii. are bad conductors of electricity.
iii. have strong forces of attraction between their molecules.
iv. have weak forces of attraction between their molecules.
The correct statements are:

Match the following with the correct response:

Column A	Column B
(i) Welding	(a) Ethyl alcohol
(ii) Fuel in a spirit lamp	(b) Ester
(iii) Lime water turns milky	(c) Carbon dioxide
(iv) Fruity smell	(d) Ethyne and oxygen

Which of the following is known as the Black lead?

Which of the following salts does not contain water of crystallisation?

1. Blue vitriol.
2. Baking soda.
3. Washing soda.
4. Gypsum.

Unlike non-metals, most metals tend to —

2ml each of concentrated HCl, HNO₃​ and a mixture of concentrated HCl and concentrated HNO_3​ in the ratio of 3 : 1 were taken in test tubes labelled as A, B and C. A small piece of metal was put in each test tube. No change occurred in test tubes A and B but the metal got dissolved in test tube C respectively. The metal could be :

Which element is getting oxidised in the following reaction: ZnO + C → Zn + CO