Question 1(a) (i) ( 1.0 marks)
Select the correct answer from the choices A, B, C, D, which are given. Write down the letter corresponding to the correct answer.
(i) To which group of the periodic table does sodium belong?
(A) Alkaline earth metals
(B) Alkali metals
(C) Halogen group
(D) Noble gases
(B) Sodium belongs to alkali metal group.
Question 1(a) (ii) ( 1.0 marks)
Which of the following statements is not true for covalent compounds?
(A) Non-polar covalent bond is formed in CH4.
(B) Polar covalent bond is formed in H-S-H.
(C) The formation of covalent bond between two neutral atoms depends on their ability to form cations and anions.
(D) No actual transfer of ...view middle of the document...
Question 1(a) (vii) ( 1.0 marks)
Which of the following statements is not correct about isomers?
(A) They have same chemical formula.
(B) They have same chemical properties.
(C) They have different structural formulae.
(D) They have different physical properties.
Isomers have different chemical properties.
Question 1(a) (viii) ( 1.0 marks)
An organic compound P has molecular formula C2H6O. On oxidation in air in the presence of alkaline KMnO4, it oxidises to form CH3COOH. What is the organic compound P?
(D) Ethanoic acid
The organic compound is an alcohol satisfying the general formula CnH2n+2O. It can be oxidised to carboxylic acid.
Question 1(a) (ix) ( 1.0 marks)
Which of the following is not an alloy of aluminium?
Brass is an alloy of copper and zinc.
Question 1(a) (x) ( 1.0 marks)
The gas law which relates the volume of a gas to the number of molecules of the gas is
(A) Avogadro’s law
(B) Gay Lussac’s law
(C) Boyle’s law
(D) Charles’ law
Question 1(b) ( 5.0 marks)
(i) Write balanced chemical equations for the following reactions.
(A) Hydrogen sulphide gas is passed through silver nitrate solution in acidic medium.
(B) Iron pyrites is roasted.
(C) Ammonium hydroxide is dissolved in nitric acid.
(D) Magnesium nitride is dissolved in water.
(E) Potassium carbonate is treated with dilute hydrochloric acid.
Question 1(c) ( 5.0 marks)
From the list given below, select the appropriate word (s) to correctly complete blanks (i) to (v) in the following passage:
Strong electrolyte cation, weak electrolyte, non-electrolyte anion, electrolyte, electrolysis, cathode, anode
A chemical compound in the fused state or in aqueous solution, which conducts electric current, is called _____(i)______. The process due to which a chemical compound in fused state or in aqueous state conducts direct current, resulting in the discharge of ions at the respective electrodes is called _____(ii)______. Benzene is a ______(iii)______. Cations are always discharged at ______(iv)______and anions are always discharged at _____(v)______.
Question 1(d) (i) ( 3.0 marks)
(i) Three elements X, Y, and Z have atomic numbers 12, 16, and 20 respectively.
(a) Which element has the highest number of valence electrons?
(b) Which two elements have similar physical and chemical properties?
(c) Which element has a total of three shells with two electrons in the outermost shell?
(a) Electronic configuration of X is 2, 8, and 2.
Electronic configuration of Y is 2, 8, and 6.
Electronic configuration of Z is 2, 8, 8, and 2.
Thus, element Y has the highest number of valence electrons i.e., 6.
(b) Elements having the same number of...