Comprehensive collection of questions from General Science asked in recent state service examinations. Each question is verified with official answer keys and step-by-step bilingual solutions.
Which of the following metals is in liquid state at normal temperature?
Monazite is an ore of:
The chemical name of limestone is-
Doctors, artists and sculptors use calcium sulphate, which is popularly known as—
UNESCO celebrated 2019 as the International Year of the Periodic Table of Chemical Elements to mark how many years of its completion?
Consider the following statements regarding the periodic table of chemical elements: 1. Along a period, ionization potential gradually decreases. 2. In a group of elements, as atomic weight increases, electron affinity decreases. 3. In a given period, as atomic number increases, electronegativity decreases. Which of the statement(s) is/are correct?
Which one of the following is found in the highest quantity as percentage by mass in the Earth's crust?
What is the general property of the oxides of groups 3 and 4?
Which of the following is NOT an element?
Next to oxygen, which is the most abundant element in the Earth's crust?
Assertion (A): In the periodic table of chemical elements, electron affinity always increases from top to bottom in a group. Reason (R): In a group, atomic radii generally increase from top to bottom. Code:
What is the mineralogical composition of diamond?
The most abundant element in the Earth's crust is-
Which of the following is the most abundant element in the Universe?
Approximately how many types of chemical elements are found on Earth?
Which of the following is a pure chemical element?
Match List-I (Oxidation State) with List-II (Element) and select the correct answer using the code given below the lists: List-I (Oxidation Number) List-II (Element) A. 2 1. Oxidation state of $\text{Mn}$ in $\text{MnO}_2$ B. 3 2. Oxidation state of $\text{S}$ in $\text{H}_2\text{SO}_4$ C. 4 3. Oxidation state of $\text{Ca}$ in $\text{CaO}$ D. 6 4. Oxidation state of $\text{Al}$ in $\text{NaAlH}_4$ Code:
The process of converting solid camphor directly into camphor vapour is called-
Which one of the following statements is NOT correct?
Which of the following processes is NOT useful for the purification of solid impurities?
Which of the following is/are example/examples of chemical change? 1. Crystallization of sodium chloride 2. Melting of ice 3. Souring/curdling of milk Select the correct answer using the code given below:
Assertion (A): Chemical reactions become faster at higher temperatures. Reason (R): Molecular motion becomes more rapid at higher temperatures. Code:
Which colloidal system is represented by 'fog'?
Consider the following statements: 1. In the process of osmosis, the solvent moves from concentrated solution towards dilute solution. 2. In reverse osmosis, external pressure is applied on the dilute solution. Which of the statements given above is/are correct?
Examples of corrosion are-