CTET/ UPTET 2019 Exam | Important Chemistry Questions | 26th November 2019




CTET/ UPTET 2019 Exam Important Science Questions:


Today, we are providing you the Science Questions, which help you to command over this subjects.Taught many interesting science information and add some fun in a science teaching-learning process.This section is not only important for CTET 2019 Exam i.e UPTETREETHTET etc. So, we will provide you the questions which will help you in preparing for Exam.



Q1. The following atomic diagram represents

(a) Nitrogen atom
(b) Helium atom
(c) Hydrogen atom
(d) Sodium atom

Q2. Which one of the following is an ionic compound?
(a) H₂O
(b) NH₃
(c) CO₂
(d) NaCl

Q3. The relative atomic masses of many elements are not whole number because 
(a) Elements are mixtures of isotopes
(b) Elements are mixtures of isobars
(c) Elements have fractional absolute masses
(d) all elements are not in gaseous state

Q4. A solution ‘x’ reacts with crushed egg-shells to give a gas that turns  lime water milky. The solution ‘x’ contains
(a) KCI (aq)
(b) NaCl (aq)
(c) HCI (aq)
(d) LiCl (aq)

Q5. In which of the following cases you expect can a displacement reaction be expected?
(a) Zinc sulphate solution + Copper turnings
(b) Copper sulphate solution + Granulated zinc
(c) Zinc sulphate solution + Iron fillings
(d) Ferrous sulphate solution + Copper turnings

Q6. A magnesium ribbon was burnt in air, its ash was dissolved in water. The resulting solution was tested with blue litmus paper and phenolphthalein solution. Which of the following would be the expected outcome?
(a) Blue litmus changes to red 
(b) Red litmus remains unchanged
(c) Phenolphthalein solution remains colour less
(d) Color of phenolphthalein solution changes to pink

Q7. Some of the observations are given below.
I. Copper sulphate solution gets decolourised by zinc metal.
II. Copper sulphate solution gets decolourised by iron metal.
III. Iron does not affect zinc sulphate solution.
In the context of the above statement which of the following is the correct the sequence
(a) Cu
(b) Cu
(c) Fe
(d) Fe

Q8. Which of the following is a neutralization reaction?
(a) 2Cu+H₂O+CO₂+O₂        Cu(OH)₂ + CuCO₃
(b) SO₂+H₂O      H₂SO₃
(c) HCl+NaOH         NaCl +H₂O
(d) Zn + H₂SO₄        ZnSO₄ + H₂ 

Q9. An inorganic compound ‘x’ on strongly heating gave oxygen, an oxide of nitrogen and a residue. Compound ‘x’ does not dissolve in nitric acid but dissolves in ammonium hydroxide. On being treated with tap water it gave a white turbidity. The compound ‘x’ is 
(a) Ag NO₃
(b) KNO₃
(c) NaNO₃
(d) NH₄NO₃

Q10. Organic manure as a better option to the use than Chemical fertilizers because
(a) it improves soil texture
(b) It helps to increase eco-friendly microbes in soil
(c) It decreases the water holding capacity of soil 
(d) It increases the porosity of soil


Solutions:

S1. Ans.(c)
Sol. Atomic diagram represents hydrogen atom 
Atomic number of H=1
It has one electron in its K shell and number of Proton in H atom=1





S9. Ans.(a)
Sol. The compound x is AgNO₃
AgNO₃ (Silver nirate) on being treated with tap water gives a white turbidity. And it does not dissolve in nitric acid but dissolves in ammonium hydroxide solution.

S10. Ans.(b)
Sol. Organic manure is preferred over chemical fertilizers because it contributes to the fertility of the soil by adding organic matter and nutrients, such as nitrogen, that are trapped by bacteria in the soil. Thus, it helps to increase eco-friendly microbes in soil.


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