10 - Science - 11. Chemistry – Chemical Reactions

10 Questions | By Padasalai10S | Last updated: Mar 21, 2022 | Total Attempts: 1851

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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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