CBSE Class 11 Chemistry VBQs States Of Matter

                                                                  UNIT – 5(STATES OF MATTER)

Question. Which of the following properties is different for solids, liquids and gases ?
(A) movement of molecules
(B) particle size of the substance
(C) mass of the substance
(D) energy exchange
Answer: A

Question. The chemical formula of a compound does not represent
(A) the total number of atoms in one molecule of the compound
(B) the number of the molecules of the compound
(C) the state of the molecules of the compound
(D) the composition of a molecule of the compound
Answer: A

Question. The change of state of substance from gas to liquid is called-
(A) melting
(B) boiling
(C) condensation
(D) vaporization
Answer: C

Question. Which of the following is not a chemical change ?
(A) rusting of iron
(B) converting water into steam
(C) making curd from milk
(D) heating coal
Answer: B

Question. A chemical equation is a means
(A) of representing chemical and physical properties of reactant molecules
(B) of acquiring instructions for the preparation of a compound
(C) or representing a chemical change by means of symbol and formulas
(D) of showing the kind of elements present in a mixture
Answer: C

Question. Which of the following is an example of a mixture ?
(A) Sugar
(B) Brass
(C) CO₂
(D) NO₃
Answer: B

Question. In a balanced chemical equation, the reactant side and the product side have the same number of
(A) atoms
(B) molecules
(C) ions
(D) electrons
Answer: A

Question. In the chemical equation,
Mg + O₂ → 2MgO, O₂ represents
(A) atoms of oxygen joined together in a molecule
(B) molecules of oxygen
(C) grams of oxygen
(D) mole of oxygen
Answer: A

Question. An atom is
(A) the smallest particle of matter known
(B) the smallest particle of a gas
(C) thesmallest indivisible particle of an element that can take part in a chemical reaction
(D) radioactive emission
Answer: A

Question. Which of the following statements about a balanced chemical equation is true ?
(A) mass is conserved
(B) atoms are conserved
(C) mass as well as atoms are conserved
(D) molecules are conserved
Answer: C

Question. Boiling point of 10% aqueous solution of common salt at atmospheric pressure is
(A) 100°C
(B) > 100°C
(C) < 100°C
(D) not possible to predict
Answer: B

Question. Air is regarded as a mixture because
(A) it pressure may vary
(B) its temperature may change
(C) its volume changes under different conditions
(D) its composition may vary
Answer: D

Question. Chemistry teacher was teaching the three variables Pressure (p), Temperature (T) and Volume (V) to XIthclass students. He taught to students that there are three laws which deals with the properties of gases at various variables keeping one of them constant.Suddenly one of them asked teacher, how can we draw the graph between two variables keeping third one constant.

(i) Name the gas law with the properties of the gases at constant pressure.

(ii) Which law deals the properties of the gases at constant temperature?

(iii) What is the Amontons’ law?

(iv) What value is associated with this concept?

Question. Sejal asked Saloni that why people are undergoing medical check-up before going on AMARNATH YATRA. Saloni explained the reason to Sejal and she got satisfied meanwhile Rishabh told that liquid boils at lower temperature at a Hilly station than in a plane area.

(i) What reason was explained by Saloni to satisfy Sejal?

(ii) Why does liquid boil at lower temperature at Hilly station?

(iii) What value is associated with Saloni?

(iv) Mention the value Associated with concept of Rishabh?

Question. One day Seema and Smriti decided to cook the food at a hill station.Seema takes a pan to cook food while Smriti started cooking the food in a pressure cooker at the same place.

(i) Who will cook rice faster?

(ii) What is the effect of pressure on boiling point?

(iii) Pressure is lower or higher at hill station?

(iv) What value is associated with the pressure of cooking food in different vessels?

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