CBSE Class 10 Science Acids bases and salts Sure Shot Questions Set 03

Question. Which of the following is a strong acid ?
(a) Lactic acid
(b) Ascorbic acid
(c) Sulphuric acid
(d) Formic acid
Answer: (c) Sulphuric acid

Question. Which of the following is a strong acid ?
(a) \( H_2CO_3 \)
(b) \( CH_3COOH \)
(c) \( HCl \)
(d) \( HCOOH \)
Answer: (c) \( HCl \)

Question. Which of the following is a dibasic acid ?
(a) \( HCl \)
(b) \( H_3PO_4 \)
(c) \( HNO_3 \)
(d) \( H_2SO_4 \)
Answer: (d) \( H_2SO_4 \)

Question. Acetic acid is a weak acid because
(a) its aqueous solution is acidic
(b) it is highly ionized
(c) it is weakly ionized
(d) it contains –COOH group
Answer: (c) it is weakly ionized

Question. The incorrect statement about acids is
(a) they give \( H^+ \) ion in water
(b) they are sour in taste
(c) they turn blue litmus red
(d) they give pink colour with phenolphthalein
Answer: (d) they give pink colour with phenolphthalein

Question. Choose an example of inorganic acid (mineral acid) from the following
(a) Oxalic acid
(b) Acetic acid
(c) Nitric acid
(d) Formic acid
Answer: (c) Nitric acid

Question. Slaked lime is prepared by adding water to
(a) bleaching powder
(b) lime water
(c) milk of lime
(d) quicklime
Answer: (d) quicklime

Question. Which of the following is not basic in nature ?
(a) KOH
(b) ZnO
(c) \( Al(OH)_3 \)
(d) NaCl
Answer: (d) NaCl

Question. Which of the following is not basic in nature ?
(a) KOH
(b) \( Ca(OH)_2 \)
(c) \( K_2SO_4 \)
(d) ZnO
Answer: (c) \( K_2SO_4 \)

Question. Mark the correct statement.
(a) Both bases and alkalies are soluble in water.
(b) Alkalies are soluble in water but all bases are not.
(c) \( C_2H_5OH \) is a base because it has OH group.
(d) Bases are soluble in water but alkalies are not.
Answer: (b) Alkalies are soluble in water but all bases are not.

Question. Acidity of ammonium hydroxide is
(a) 1
(b) 2
(c) 4
(d) 3
Answer: (a) 1

Question. Which of the following is the weakest base ?
(a) NaOH
(b) \( Ca(OH)_2 \)
(c) \( NH_4OH \)
(d) KOH
Answer: (c) \( NH_4OH \)

Question. Which one of the following will turn red litmus blue?
(a) Vinegar
(b) Baking soda solution
(c) Lemon juice
(d) Soft drinks
Answer: (b) Baking soda solution

Question. Which of the following statements is true regarding acids and bases ?
(a) Acid and bases don't react with each other
(b) Acids mixed with bases neutralise each other
(c) Acids mixed with bases make stronger acids
(d) Acids mixed with bases make stronger bases
Answer: (b) Acids mixed with bases neutralise each other

Question. A blue litmus paper was first dipped in dil. HCl and then in dil. NaOH solution. It was observed that the colour of the litmus paper
(a) changed to red
(b) changed first to red and then to blue
(c) changed blue to colourless
(d) remained blue in both the solutions
Answer: (b) changed first to red and then to blue

Question. Phenolphthalein is
(a) yellow in acidic medium, pink in basic medium
(b) pink in acidic medium, colourless in basic medium
(c) colourless in acidic medium, pink in basic medium
(d) pink in acidic medium, yellow in basic medium
Answer: (c) colourless in acidic medium, pink in basic medium

Question. When dilute hydrochloric acid is added to granulated zinc placed in a test tube, the observation made is that
(a) the surface of the metal turns shining
(b) the reaction mixture turns milky
(c) odour of chlorine is observed
(d) a colourless and odourless gas is evolved with bubbles
Answer: (d) a colourless and odourless gas is evolved with bubbles

Question. The reaction of metal with acid results in the formation of
(a) only hydrogen gas
(b) only salt
(c) both salt and hydrogen gas
(d) None of the options
Answer: (c) both salt and hydrogen gas

Question. When zinc reacts with sodium hydroxide, the products formed are
(a) zinc hydroxide and sodium
(b) sodium zincate and water
(c) sodium zincate and hydrogen gas
(d) sodium zincate and oxygen
Answer: (c) sodium zincate and hydrogen gas

Question. Which of the following metals can displace hydrogen from the aqueous solution of sodium hydroxide ?
(a) Mg
(b) Cu
(c) Al
(d) Ag
Answer: (c) Al

Question. When metal Z is added to dilute HCl solution, there is no evolution of gas. Metal is
(a) K
(b) Na
(c) Ag
(d) Zn
Answer: (c) Ag

Question. An alloy of zinc and copper is dissolved in dilute hydrochloric acid. Hydrogen gas is evolved. In this evolution of gas
(a) only zinc reacts with dilute hydrochloric acid
(b) only copper reacts with dilute hydrochloric acid
(c) both zinc and copper react with dilute hydrochloric acid
(d) only copper reacts with water
Answer: (a) only zinc reacts with dilute hydrochloric acid

Question. Cu + HCl \( \to \)
(a) react vigorously
(b) no reaction
(c) react moderately
(d) react slowly
Answer: (b) no reaction

Question. Copper sulphate solution can be safely kept in a container made of
(a) Aluminium
(b) Lead
(c) Silver
(d) Zinc
Answer: (c) Silver

Question. Beakers A, B and C contain zinc sulphate, silver sulphate and iron (II) sulphate solutions respectively. Copper pieces are added to each beaker. Blue colour will appear in case of
(a) beaker A
(b) beaker B
(c) beaker C
(d) All the beakers
Answer: (b) beaker B

Question. Which of the following reactions cannot occur?
(a) \( 2AgNO_3(aq) + Fe(s) \to Fe(NO_3)_2(aq) + 2Ag(s) \)
(b) \( CuSO_4(aq) + Zn(s) \to ZnSO_4(aq) + Cu(s) \)
(c) \( CuSO_4(aq) + 2Ag(s) \to Cu(s) + Ag_2SO_4(aq) \)
(d) \( 2AgNO_3(aq) + Zn(s) \to Zn(NO_3)_2(aq) + 2Ag(s) \)
Answer: (c) \( CuSO_4(aq) + 2Ag(s) \to Cu(s) + Ag_2SO_4(aq) \)

Question. A student puts one big iron nail each in four test tubes containing solutions of zinc sulphate, aluminium sulphate, copper sulphate and iron sulphate. A reddish-brown coating was observed only on the surface of iron nail which was put in the solution of
(a) Zinc sulphate
(b) Iron sulphate
(c) Copper sulphate
(d) Aluminium sulphate
Answer: (c) Copper sulphate

Question. The reaction \( Cu^{2+}(aq) + Zn(s) \to Zn^{2+}(aq) + Cu(s) \), indicates that the metal which appears lower in the reactivity series is
(a) Zn
(b) Cu
(c) \( Zn^{2+} \)
(d) \( Cu^{2+} \)
Answer: (b) Cu

Question. Which of the following acids are highly corrosive in nature?
(a) Acetic acid and oxalic acid
(b) Acetic acid and sulphuric acid
(c) Sulphuric acid and nitric acid
(d) Carbonic acid and acetic acid
Answer: (c) Sulphuric acid and nitric acid

Question. Which of the following does not give \( H^+ \) ions in aqueous solution?
(a) \( H_2CO_3 \)
(b) \( C_2H_5OH \)
(c) \( CH_3COOH \)
(d) \( H_3PO_4 \)
Answer: (b) \( C_2H_5OH \)

Question. Which one of the following is a strong electrolyte?
(a) Carbon disulphide
(b) Ammonium hydroxide
(c) Sodium chloride
(d) Water
Answer: (c) Sodium chloride