Alkali Metals

Q. Question 5.3
Translate the following statement into chemical equation and then balance it:

Barium chloride reacts with aluminium sulphate to give aluminium chloride and a precipitate of barium sulphate.

Q.

Question 35
Balance the following chemical equations and identify the type of chemical reaction.
(a) Mg(s)+Cl2(g)→MgCl2(s)
(b) HgO(s)Heat−−→Hg(l)+O2(g)
(c) Na(s)+S(s)Fuse−−→Na2S(s)
(d) TiCl4(l)+Mg(s)→Ti(s)+MgCl2(s)
(e) CaO(s)+SiO2(s)→CaSiO3(s)
(f) H2O2(l)UV−−→H2O(l)+O2(g)

Q. Question 8.1
Write the balanced chemical equation for the following and identify the type of reaction:

Potassium bromide (aq) + Barium iodide (aq) $\to$ Potassium iodide (aq) + Barium bromide(s)

Q.

Why are alkali metals considered to be powerful reducing agents?

Q.

Which is the most reactive and least reactive non metal?

Q.

What are halogens

Q.

The elements of group 1 are called alkali metals because:

1. their oxides form acidic solutions on treating with water

2. Their peroxides form alkalies solution on treating with water

3. Their oxides and hydroxides form alkalies solutions on treating with water.

4. Their hydroxides form an acidic solution on treating with water.

Q. What is a test for hydrogen gas?

1. It turns blue litmus red
2. It burns with a pop sound
3. It turns reddish brown on reaction with oxygen
4. It turns lime water milky

Q.

Why Alkali metals are soft and have low melting point?

Q.

Write the formulae and then balance the following chemical equations.

Magnesium + Silver nitrate $\to$ Magnesium nitrate + Silver

Q.

(a) What are the following groups known as ?

(i) Group 1 (ii) Group 17 (iii) Group 18

(b) Name two elements of each group.

Q. The chloride of a metal contains 71% of chlorine by weight and its vapour density is 50.What will be the atomic weight of the metal?

Q. Question 4 (a)
Lithium, sodium, potassium are all metals that react with water to liberate hydrogen gas. Is there any similarity in the atoms of these elements?

Q.

Among the statements (a)-(d), the correct ones are:

a) Lithium has the highest hydration enthalpy among the alkali metals.

b) Lithium chloride is insoluble in pyridine.

c) Lithium cannot form ethynide upon its reaction with ethyne.

d) Both lithium and magnesium react slowly with${\mathrm{H}}_2\mathrm{O}$.

1. $\left(\mathrm{a}\right),\left(\mathrm{b}\right)$ and $\left(\mathrm{d}\right)$ only

2. $\left(\mathrm{b}\right)$ and $\left(\mathrm{c}\right)$ only

3. $\left(\mathrm{a}\right),\left(\mathrm{c}\right)$ and $\left(\mathrm{d}\right)$ only

4. $\left(\mathrm{a}\right)$ and $\left(\mathrm{d}\right)$ only

Q.

Why do alkali metals float on water?

Q.

Which is chemically most active non metal?

1. F₂

2. N₂

3. O₂

4. He

Q.

What is the metallic radius?

Q.

Is sodium and potassium a soft metal

Q. Question 1
Which of the following correctly represent the electronic distribution in the Mg atom?

(a) 3, 8, 1
(b) 2, 8, 2
(c) 1, 8, 3
(d) 8, 2, 2

Q. The Carbonate of a metal is isomorphous with MgCo3 and contains 6.091 percentage of carbon atomic weight of metal is

Q. Which amongst these elements has the least metallic character?

1. Potassium
2. Sodium
3. Magnesium
4. Calcium

Q.

Write the Bohr Bury scheme to fill the electrons in various energy levels of an atom.Using these rules, write the electron arrangement of the elements having atomic numbers 6, 11, 15 and 18.

Q.

Write the balanced chemical equation for the reaction Magnesium sulphate solution is mixed with barium chloride solution.?

Q.

Is hydrogen an alkali metal?

Q.

Which one of the following is a metal?

1. Carbon

2. Nitrogen

3. Sodium

4. Oxygen

Q.

In the periodic table, the basic character of oxides

1. Increases from left to right and decreases from top to bottom

2. Decreases from right to left and increases from top to bottom

3. Decreases from left to right and increases from top to bottom

4. Decreases from left to right and increases from bottom to top

Q.

Which among the following compounds are formed when an alkali metal reacts with hydrogen and halogen respectively?

1. Metal hydride and metal halide

2. Metal hydrate and metal halide

3. Metal hydrate and metal halide

4. Metal hydrate and metal hydrate

Q.

Find the atomic number of an element whose atom has the electronic configuration 2, 8, 4.

Q. Hydrogen is similar to alkali metals in that it has a ionisation enthalpy.

1. high
2. low
3. moderate

Q.

Imagine that the electron in a hydrogen atom is replaced by a muon $\left(\mu \right)$. The mass of a muon particle is $207times$ that of an electron and the charge is equal to the charge of an electron. The ionization potential of this hydrogen atom will be:

1. $27.2eV$

2. $331.2eV$

3. $13.6eV$

4. $2815.2eV$