## What is the general trend for ionization enthalpies of alkali metals as we move down the group?

A. it increases
B. it decreases
C. it is the same for all
D. None of these

Correct Answer: B. it decreases

### Detailed About MCQs

The ionization enthalpies of the alkali metals are considerably low and decrease down the group from Li to Cs.

## What is the general trend for atomic radii of alkali metals as we move down the group?

A. it increases
B. it decreases
C. it remains constant
D. None of these

Correct Answer: A. it increases

### Detailed About MCQs

The atomic and ionic radii of alkali metals increase on moving down the group i.e., they increase in size while going from Li to Cs.

## Which chemical is also known as “Chinese snow”?

A. Silver iodide
B. Potassium nitrate
C. Ammonium chloride
D. Sodium phosphate

Correct Answer: B. Potassium nitrate

### Detailed About MCQs

Potassium nitrate is one of several nitrogen-containing compounds collectively referred to as saltpeter. It is also known as “Chinese snow”. Major uses of potassium nitrate are in fertilizers, rocket propellants, and fireworks.

## “Atoms can neither be created nor destroyed.” This principle was given by:

B. Dalton
C. Rutherford
D. Niels Bohr

Correct Answer: B. Dalton

### Detailed About MCQs

The given principle is one of the postulates of Dalton’s atomic theory given in 1803 by John Dalton. The postulates of Dalton’s atomic theory are as follows:
1. Elements consist of indivisible small particles (atoms).
2. All atoms of the same element are identical; different elements have different types of atom.
3. Atoms can neither be created nor destroyed.

## White Phosphorous is represented by which symbol?

A. P1
B. P2
C. P3
D. P4

Correct Answer: D. P4

### Detailed About MCQs

The most important form of elemental phosphorus from the perspective of applications and chemical literature is white phosphorus. It consists of tetrahedral P4 molecules, in which each atom is bound to the other three atoms by a single bond.

## Which is also known as wood alcohol?

A. Methanol
B. Ethanol
C. Propanal
D. Butanol

Correct Answer: A. Methanol

### Detailed About MCQs

Methanol (CH3OH) is also known as Wood Alcohol. It’s a solvent in many chemical processes and is a component of automobile antifreeze.

## The term “white coal” sometimes referred to which of the following?

A. Geothermal Electricity
B. Wind Energy
C. Hydroelectricity
D. Biomass Energy

Correct Answer: C. Hydroelectricity

### Detailed About MCQs

The term white coal was used for Hydroelectricity, particularly in Europe, because of its capability to produce more energy than any other source except coal. The term was coined by a French Engineer Aristide Bèrges.

## A Gold Ring which is 50% pure. Its purity can be alternatively shown as:

A. 18 Carat
B. 18 Karat
C. 12 Carat
D. 12 Karat

Correct Answer: D. 12 Karat

### Detailed About MCQs

The carat is the common unit used to describe the mass of a gem. A 1-carat diamond, for example, has a mass of 0.20 g. The karat is the common unit used to describe the purity of precious metals, such as gold. A 24-karat gold ring is as pure as can be. A gold ring that is 50 % pure is 12 karat.

## What is the stress known as when there is a relative displacement between various layers of solid?

A. Tangential
B. Linear
C. Lateral
D. Longitudinal

Correct Answer: A. Tangential

### Detailed About MCQs

When successive layers of solid move on each other i.e. when there is a relative displacement between various layers of solid, the stress produced is called as Tangential stress.

A. 2 times
B. 3 times
C. √2 times
D. √3 times