Every question from this NCERT chapter, with a detailed explanation.
What is the correct symbol for the SI unit ‘mole’?
Who is credited with proposing the Law of Conservation of Mass?
Which of the following are considered chemical properties of matter? 1. Melting point 2. Boiling point 3. Acidity 4. Reactivity with acids Select the correct answer using the code given below.
Which international body and treaty are responsible for the maintenance of the SI unit system?
Who is credited with proposing the Law of Definite Proportions?
Who proposed the Law of Gaseous Volumes?
According to Avogadro’s law, equal volumes of all gases at the same temperature and pressure contain equal numbers of:
Which of the following values represents the Avogadro number?
What is the SI derived unit of pressure?
With reference to early Indian philosophical thought on matter, consider the following statements: 1. Acharya Kanada proposed that matter is continuous and not made of discrete particles. 2. He postulated the formation of pairs or triplets from minute particles. 3. He considered these particles to be eternal and indivisible. Which of the statements given above is/are correct?
Which symbol represents the SI prefix for the factor 10^-6?
Which of the following is an example of a homogeneous mixture?
Which of the following is classified as a pure substance?
Which agents were historically used to impart colour to glass and glazes?
What is the chemical formula of ‘saltpetre’ used in fireworks?
Which equation correctly represents the relationship between the Kelvin (K) and Celsius (°C) temperature scales?
What is the boiling point of water on the Fahrenheit scale at standard pressure?
The states of matter can be interconverted primarily by changing which conditions?
Match List-I with List-II and select the correct answer using the code given below: List-I (Ancient Text) | List-II (Content) A. Rasarnavam | 1. Preparation of gunpowder mixture B. Rasopanishada | 2. Formulation of mercury compounds C. Rasratnakar | 3. Uses of furnaces, ovens and crucibles D. Charaka Samhita | 4. Use of bhasma of metals
Assertion (A): The use of soap is a strictly modern invention introduced to India by Europeans in the 19th century. Reason (R): Ancient texts describe the use of mustard oil and alkalies as ingredients for making soap-like substances.
Which of the following statements about mixtures and pure substances is/are correct? 1. The components of a homogeneous mixture are uniformly distributed throughout. 2. The constituents of a compound can be easily separated by physical methods. 3. A mixture always has a fixed composition. Select the correct answer using the code given below.
Which of the following statements about elements and compounds is/are correct? 1. Some elements exist as diatomic molecules under ordinary conditions. 2. The properties of a compound are identical to those of its constituent elements. 3. An element consists of only one type of atom. Select the correct answer using the code given below.
Which of the following correctly pairs an SI prefix with its corresponding power of ten?
Consider the following statements regarding mass and weight: 1. The mass of a substance varies with its location due to gravity. 2. Weight is the force exerted by gravity on an object. 3. Mass is accurately measured using an analytical balance in laboratories. Which of the statements given above is/are correct?
Which of the following correctly expresses the definition and SI unit of density?
Which of the following statements regarding Avogadro’s proposal is/are correct? 1. Equal volumes of all gases at the same temperature and pressure contain equal masses. 2. Considering hydrogen and oxygen as diatomic molecules explains the volume relations in water formation. Select the correct answer using the code given below.
Which of the following are correct regarding the mole and Avogadro constant? 1. The Avogadro constant is a dimensionless quantity. 2. One mole contains exactly 6.02214076 × 1023 elementary entities. 3. The amount of substance is symbolised as 'A'. Select the correct answer using the code given below.
Which power of ten corresponds to the SI prefix ‘nano’?
What is the exact fixed numerical value of the Avogadro constant as per the current SI definition?
Which of the following statements about states of matter is/are correct? 1. In solids, particles are held close together in an orderly fashion. 2. In liquids, particles are far apart and move very fast. 3. In gases, particles are far apart compared to those in solids and liquids. Select the correct answer using the code given below.
Which of the following statements about the Law of Definite Proportions is/are correct? 1. It implies that the composition of a compound depends on the method of its preparation. 2. A given compound always contains the same proportion of elements by weight. Select the correct answer using the code given below.