Question

Choose the correct option


1. Which of the following pairs of elements will react to give a gas that dissolves in water to form an
acid?

(a) Hydrogen and oxygen
(b) Hydrogen and chlorine
(c) Hydrogen and nitrogen
(d) None of these


2. With which of the following elements will hydrogen react to give a gas that smells like rotten eggs?

(a) Oxygen
(b) Chlorine
(c) Nitrogen
(d) Sulphur


3. Which among the following metals reacts with water most vigorously?

(a) Sodium
(b) Magnesium
(c) Zinc
(d) Iron


4. Which of the following metals will not displace hydrogen from water?
(b) Potassium

(a) Sodium
(c) Calcium
(d) Copper​

Answer 1

Answer:

1, Hydrogen And oxygen

2,hydrogen sulphide

3,The alkali metals (Li, Na, K, Rb, Cs, and Fr) are the most reactive metals in the periodic table - they all react vigorously or even explosively with cold water, resulting in the displacement of hydrogen.

4,Magnesium and zinc metals displace hydrogen from dilute acids. Copper and silver do not displace hydrogen from dilute acids.

Answer 2

Answer:

1.

$\longrightarrow$ b. Hydrogen and chlorine.

Reaction: 2H2 + Cl2 $\longrightarrow$ H2 + 2HCl

2.

$\longrightarrow$ d. Sulphur

${\red{\bigstar}}$ Hydrogen reacts with sulphur to form hydrogen sulphide (H2S) which smells like rotten egg.

3.

$\longrightarrow$ a. Sodium

${\red{\bigstar}}$ Sodium reacts with water vigorously.

4.

$\longrightarrow$ a. Copper

$\pink{Hope \: it \: helps}$