Explanation

The standard 52-card deck[citation needed] of French-suited playing cards is the most common pack of playing cards used today. 

Explanation

Chloroform, or trichloromethane, is an organic compound with the formula CHCl₃.

It is a colorless, sweet-smelling, dense liquid that is produced on a large scale as a precursor to PTFE.

Explanation

The chemical formula CaO represents calcium oxide

Composition:

It consists of one calcium (Ca) cation and one oxygen (O) anion. 

Properties:

It is an alkaline, ionic compound. 

Common Names:

Known as quicklime, lime, or calcia. 

Formation:

It is produced by heating calcium carbonate (limestone) in a kiln. 

Uses:

Found in construction materials, agriculture (as a fertilizer), and the paper industry. 

Explanation

An alkaline substance has a pH greater than 7.

The pH scale ranges from 0 to 14, where 7 is neutral, and values above 7 indicate increasing alkalinity.

Common examples of alkaline substances include seawater and soapy water,

Bleach is a strongly alkaline substance with a pH of around 13.  

Explanation

Water reaches its maximum density at approximately 4° Celsius (39.2° Fahrenheit).

This unusual behavior is due to the hydrogen bonds in water, which cause molecules to pack more closely together, increasing density.

Below this temperature, the hydrogen bonds weaken,
And the molecules begin to spread out, decreasing the density as water expands and forms ice. 

Explanation

- Nitrogen (N) = 14  

- Hydrogen (H) = 1 × 3 = 3  

- Total = 14 + 3 = 17

Explanation

Multiply the numerators: 1 × 1 = 1  

Multiply the denominators: 3 × 2 = 6  

So, 1/3 × 1/2 = 1/6 

Explanation

The SI unit of radioactivity is becquerel (Bq).

Curie is a non-SI unit, with 1 curie equal to 37 billion Bq.

Radioactive decay (also known as nuclear decay, radioactivity, radioactive disintegration, or nuclear disintegration)

It is the process by which an unstable atomic nucleus loses energy by radiation.

Three of the most common types of decay are:

• Alpha
• Beta
• Gamma decay

Explanation

Uzbekistan Capital is Tashkent.

Uzbekistan Currency is Uzbekistan Som.

Uzbekistan official language is Uzbek; Russian.

Uzbekistan located is in Continent Asia.

Uzbekistan Primary Religion is Islam.

Uzbekistan Head of Govt. is Prime Minister – Abdulla Aripov.

Uzbekistan Parliament called Oliy Majlis.

Tricks for Remember

RK13-12-2022

Explanation

Given numbers:  

13, 14, 13, 17, 19, 17.5, 13

Now count the frequency:

- 13 → 3 times

- 14 → 1 time  

- 17 → 1 time  

- 17.5 → 1 time  

- 19 → 1 time  

Most frequent = 13