10 - Science - 11. Chemistry – Chemical Reactions
10 Questions
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Prepared By Mr. S. Ravikumar, B. T. Asst. , GHS, Arangaldhurgam, Vellore District. ; &nbs p; & www. Padasalai. Net
Questions and Answers
- 1.Zn + 2HCl → ZnCl2 + H2 ↑ The above reaction is an example of _________
- A.
Combination reaction
- B.
Double displacement reaction
- C.
Displacement reaction
- D.
Decomposition reaction
- 2.A reddish brown coloured element ‘X’ on heating in air becomes black coloured compound ‘Y’. X and Y are______ and ________
- A.
Cu, CuO
- B.
Pb, PbO
- 3.A student tested the pH of pure water using a pH paper. It showed green colour. If a pH paper is used after adding lemon juice into water, what color will he observe?
- A.
Green
- B.
Red
- C.
Yellow
- 4.Chemical volcano is an example of _____________
- A.
Combination reaction
- B.
Decomposition reaction
- 5.When crystals of lead nitrate on heating strongly produces a ____ (NO2 / CO2) gas and the colour of the gas is _________ (reddish brown/ white)
- A.
NO2, reddish brown
- B.
CO2, reddish brown
- C.
NO2, white
- D.
CO2, white
- 6.When aqueous solution of silver nitrate and sodium chloride are mixed _______ precipitate is immediately formed. (white / yellow / red)
- A.
White
- B.
Yellow
- C.
Red
- 7.Zinc can displace aluminium metal from aqueous solution of aluminium sulphate.
- A.
Zinc is more reactive than aluminium
- B.
Aluminium is more reactive than zinc
- 8.To protect tooth decay, we are advised to brush our teeth regularly. The nature of the tooth paste commonly used is ______ in nature.
- A.
Acidic
- B.
Basic
- 9.Vinegar is present in acetic acid. Curd contains _____ acid.
- A.
Lactic acid
- B.
Tartaric acid
- 10.PH = - log10 [H+]. The pH of a solution containing hydrogen ion concentration of 0.001M solution is _____
- A.
3
- B.
11
- C.
14
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