General Science Jkssb Chemistry Set 1 Mcqs (504 MCQs) | JKSSB & SSC Quiz

General Science

jkssb chemistry set 1 mcqs

Download PDF

Topics

jkssb physics set 1 mcqs jkssb chemistry set 1 mcqs jkssb biology set 1 mcqs

Practice Questions

504 Total
Question 91 Discuss
Ask a Friend

What is the product of the following chemical reaction? NaCl +H2O+CO2 +NH3

A
Gypsum
B
Baking soda
C
Washing soda
D
Bleaching powder

Answer & Explanation

Correct Option: B

This represents the first step of the Solvay process, historically developed by Ernest Solvay in the 1860s. The reaction produces ammonium chloride and sodium bicarbonate, which is commonly known as baking soda.
Question 92 Discuss
Ask a Friend

The condition when the amount of dissolved oxygen in a water body is alarmingly decreased is called:

A
anoxia
B
hypothermia
C
acidification
D
hypoxia

Answer & Explanation

Correct Option: D

Hypoxia refers to a condition where dissolved oxygen concentrations in a water body fall to levels that are detrimental to aquatic organisms. Historically, nutrient runoff from human agriculture has increasingly caused these dead zones.
Question 93 Discuss
Ask a Friend

Which of the following is an example of a physical change? In this example, there is no change in chemical composition of matter. A: Coal changing into coal ash on burning B: Preparing a sweet drink by mixing sugar in water C: White washing walls using a solution of lime and water D: Mixing salt and lemon juice in a beaker

A
Only D
B
Only A
C
Only C
D
Only B

Answer & Explanation

Correct Option: D

Preparing a sweet drink by dissolving sugar in water is a reversible physical change because the chemical composition of the sugar and water remains unchanged. The other options involve chemical reactions that form distinctly new chemical substances.
Question 94 Discuss
Ask a Friend

In which year did John Dalton present his atomic theory, the second part of which states that all atoms of a particular element are equal?

A
1825
B
1808
C
1811
D
1800

Answer & Explanation

Correct Option: B

John Dalton first introduced his scientific atomic theory in 1803 and officially published it in his 1808 work, 'A New System of Chemical Philosophy'. This theory was a major historical milestone because it scientifically proposed that all matter is composed of indivisible atoms.
Question 95 Discuss
Ask a Friend

In the periodic table, what is the trend for atomic radius as you move from left to right across a period (horizontal row)?

A
Atomic radius remains constant
B
Atomic radius decreases
C
Atomic radius exhibits irregular behaviour
D
Atomic radius increases

Answer & Explanation

Correct Option: B

As you move from left to right across a period, the atomic number increases, adding more protons to the nucleus. This creates a stronger effective nuclear charge that pulls the electron cloud closer, thereby decreasing the atomic radius.
Question 96 Discuss
Ask a Friend

At 10 ×104 Pa pressure and 300 K temperature, the volume of 0.09 mol CO 2 gas is 22.4 × 10−3 m3. What will be the volume of the gas if the pressure is decreased to 2 × 104 Pa ?

A
112.0 ×10−3 m3
B
37.4 × 10−3 m3
C
56.3 × 10−3 m3
D
28.1 × 10−3 m3

Answer & Explanation

Correct Option: A

According to Boyle's Law, formulated by Robert Boyle in 1662, the pressure and volume of a gas have an inverse relationship at a constant temperature. Using the formula P1V1 = P2V2, decreasing the pressure by a factor of five mathematically increases the volume to 112.0 × 10−3 m3.
Question 97 Discuss
Ask a Friend

The space-filling model emphasises the relative size of each atom based on its .

A
van der Waals radius
B
fixed radius for all atoms
C
ionic radius
D
covalent radius

Answer & Explanation

Correct Option: A

In physical chemistry, a space-filling model uses spheres to represent atoms, with the radius of each sphere strictly proportional to the atom's van der Waals radius. This accurately depicts the effective volume occupied by an atom as it relates to intermolecular collision distances.
Question 98 Discuss
Ask a Friend

Which type of molecules show dipole dipole interaction?

A
Non-polar molecules
B
Molecules possessing permanent dipole
C
Molecules possessing transient dipole
D
Ionic molecules

Answer & Explanation

Correct Option: B

Dipole-dipole interactions exclusively occur between molecules that have a permanent dipole moment, meaning there is an unequal sharing of electrons leading to distinct positive and negative partial charges. These cohesive forces are significantly stronger than the transient London dispersion forces found in non-polar molecules.
Question 99 Discuss
Ask a Friend

Which of the following is a natural indicator for acid and base?

A
Phenolphthalein
B
Turmeric
C
Methyl orange
D
Universal indicator

Answer & Explanation

Correct Option: B

Turmeric is a naturally occurring acid-base indicator that famously changes from yellow in acidic and neutral solutions to bright red in basic solutions. Other common natural indicators utilized historically before synthetic chemicals include litmus (extracted from lichens) and red cabbage juice.
Question 100 Discuss
Ask a Friend

Which of the following is a molecular compound?

A
Sodium chloride
B
Calcium oxide
C
Water
D
Magnesium sulfate

Answer & Explanation

Correct Option: C

A molecular compound consists of discrete molecules formed by covalently bonded non-metal atoms, such as water (H2O). The other options provided are ionic compounds, which are formed instead by the electrostatic attraction between metal cations and non-metal anions.
Previous Next