A substance which gives brick red flame and breaks down on heating to give oxygen and a brown gas is
1. Magnesium nitrate
2. Calcium nitrate
3. Barium nitrate
4. Strontium nitrate
Which of the following statements is true about ?
1. It is used in the preparation of bleaching powder
2. It is a light blue solid
3. It does not possess a disinfectant property
4. It is used in the manufacture of cement
Chemical A is used for the preparation of washing soda to recover ammonia. When CO2 is bubbled through an aqueous solution of A, the solution turns milky. It is used in whitewashing due to its disinfectant nature. The chemical formula of A is-
1.
2.
3.
4.
Dehydration of hydrates of halides of calcium, barium and strontium i.e., , , , can be achieved by heating.
These become wet on keeping in air. Which of the following statements is correct about these halides?
1. | Act as dehydrating agent |
2. | Can adsorb moisture from air |
3. | Tendency to form hydrate decreases from calcium to barium |
4. | All of the above |
Metallic elements are described by their standard electrode potential, fusion enthalpy, atomic size, etc. The alkali metals are characterized by which of the following properties?
a. High boiling point
b. High negative standard electrode potential
c. High-density
d. Large atomic size
1. (a, b)
2. (b, c)
3. (c, d)
4. (b, d)
Several sodium compounds find use in industries. Which of the following compounds are used in the textile industry?
a.
b.
c.
d.
Choose the correct option
1. (a, c)
2. (b, c)
3. (c, d)
4. (a, d)
Which of the following compounds are readily soluble in water?
a.
b.
c.
d.
Choose the correct option
1. (a, b)
2. (b, c)
3. (c, d)
4. (a, d)
When zeolite, which is hydrated sodium aluminium silicate is treated with hard water, the sodium ions are exchanged with which of the following ion(s)?
a. ions
b. ions
c. ions
d. ions
Choose the correct option
1. (a, b)
2. (b, c)
3. (c, d)
4. (a, d)
Identify the correct formula of halides of alkaline earth metals from the following.
1.
2.
3.
4.
Choose the correct option
1. (a, b)
2. (b, c)
3. (c, d)
4. (a, c)
Choose the correct statements from the following.
a | Beryllium is not readily attacked by acids because of the presence of an oxide film on the surface of the metal |
b. | Beryllium sulphate is readily soluble in water as the greater hydration enthalpy of Be2+ overcomes the lattice enthalpy factor |
c | Beryllium exhibits coordination number more than four |
d | Beryllium oxide is purely acidic in nature |
1. (a, b)
2. (b, c)
3. (c, d)
4. (a, d)