Question

Class : VII Subject : Chemistry for zoom classes Topic : Acids and Bases (Indicators and source of Acids and Bases) and Basics in chemistry 1. The substance which turns blue to red litmus. What is that substance ? [ ] [ ] [ ] [ ] [ ] [ ] [ ] [ ] [ ] d)C+O2  CO a) Base b) Acid 2. The source of acetic acid is a) Oxalic acid b) Vinegar 3. Which of the following is an organic acid ? a) Acetic acid b) Tartaric acid 4. Which of the following contains oxalic acid a) Lemon b) Vinegar c) Salt c) Tartaric acid c) Oxalic acid c) Spinach 5. Which of the following is used to glass cleaners. a) Calcium hydroxide c) Magnesium hydroxide 6. Valency of Nitrogen in NH3 is a) 1 b) 2 c) 3 d) 4 d)+4 d) Al2(SO4)2 7. The common oxidation number exhibited by the IIIA group elements is a)+1 b)+2 c)+3 8. The chemical formula of Aluminium sulphate a) Al3(SO4)2 b) AlSO4 9. Identify the balanced chemical equation a)H2 +O2  H2O b)N2 +H2  NH3 10. Elements exhibits variable valencies are a) Copper b) Iron c) Al2(SO4)3 c)H2 +Cl2  2HCl c) Tin [ ] d) None d) All d) All d) All b) Ammonium hydroxide d) Sodium hydroxide 1 d) All

Answer 1

Answer:

The Moon is an astronomical body orbiting Earth as its only natural satellite. It is the fifth-largest satellite in the Solar System, and by far[13] the largest among planetary satellites relative to the size of the planet that it orbits (its primary). The Moon is, after Jupiter's satellite Io, the second-densest satellite in the Solar System among those whose densities are known.