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The colour of an aqueous solution of zinc sulphate as observed in the laboratory is:
(1) Green
(2) Yellow
(3) Blue
(4) Colourless
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To show that zinc is a more active metal than copper, the correct procedure is to:
(1) add dilute nitric acid on strips of both the metals.
(2) observe transmission of heat through strips of zinc and copper.
(3) prepare solution of zinc sulphate and hang strip of copper into it.
(4) prepare solution of copper sulphate and hang strip of zinc into it.
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What is observed after about 1 hour of adding the strips of copper and aluminium separately to the ferrous sulphate solution filled in two beakers? Name the reaction if any change in colour is noticed. Also, write a chemical equation for the reaction.
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Identify the type of reaction taking place in the following case and write the balanced chemical equation for the reaction.
Zinc reacts with silver nitrate to produce zinc nitrate and silver.
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Classify the following reaction into different type:
AgNO3(aq) + NaCl(aq) →AgCl(s) + NaNO3(aq)
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Classify the following reaction into different type:
Zn + CuSO4 → ZnSO4 + Cu
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Give reasons for the following:
The reaction of iron (III) oxide [Fe2O3] with heated aluminum is used to join cracked machine parts.
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Which of the following is a displacement reaction?
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\[\ce{Pb + CuCl2 -> PbCl2 + Cu}\]
The above reaction is an example of:
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The defect of vision in which the person is able to see a distant object distinctly but cannot see nearby objects clearly is called:
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Assertion: The near point of a hypermetropia eye is more than 25 cm away.
Reason: Hypermetropia is corrected using spectacles containing concave lenses.
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A positive charge is moving towards a person. The direction of magnetic field lines will be in ____________.
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A current through a horizontal power line flows from south to north direction. The direction of magnetic field line 0.5m above it is ____________.
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The strength of each magnet reduces to half when it is cut along its length into the equal parts magnetic field strength of a solenoid. The polarity of the solenoid can be determined by ____________.
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Which of the two sets belong to the same trophic level?
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A positive charge is moving upwards in a magnetic field directed towards the north. The particle will be deflected towards ____________.
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In a food chain the second trophic level is occupied by ______.
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Who has stated the Right-hand Thumb Rule?
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Food chains are very important for the survival of most species.
If Ravi is consuming curd/yogurt for lunch, which trophic level in a food chain he should be considered as occupying?
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Food chains are very important for the survival of most species.
The decomposers are not included in the food chain. The correct reason for the same is because decomposers:
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