Subject :NSO Class : Class 6
Subject :NSO Class : Class 8
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Subject :NSO Class : Class 5
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Subject :NSO Class : Class 5
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Subject :NSO Class : Class 5
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Subject :NSO Class : Class 7
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Subject :NSO Class : Class 7
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Subject :NSO Class : Class 6
The properties of three substances are given below.
| Substance | Solubility in water | Nature |
| I | II | III |
| Soluble | Insoluble | Insoluble |
| Non-magnetic | Magnetic | Non-magnetic |
Which of the following sequence of steps should be carried out to separate I from a mixture of I, II and III?
AMagnetic separation, addition of water and sedimentation-decantation.
BEvaporation, magnetic separation, filtration and addition of water.
CEvaporation, magnetic separation, filtration and addition of water.
DFiltration, magnetic separation, addition of water and evaporation.
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Subject :NSO Class : Class 7
Consider the following statements (I-IV) and fill in the blanks by choosing the appropriate option.
I. An antacid such as P is used to cure indigestion.
II. Lime water contains Q , which turns milky with carbon dioxide.
III. Soap solution is basic due to presence of R . It turns turmeric stain of shirt to red.
IV. Baking soda is S which reacts with vinegar to evolve carbon dioxide gas.
| P | Q | R | S | |
| A | Milk of magnesia | Calcium hydroxide | Sodium hydroxide | Sodium hydrogen carbonate |
| B | Calcium hydroxide | Milk of magnesia | Sodium hydroxide | Sodium hydrogen carbonate |
| C | Sodium hydroxide | Sodium hydrogen carbonate | Calcium hydroxide | Milk of magnesia |
| D | Sodium hydrogen carbonate | Calcium hydroxide | Milk of magnesia | Sodium hydrogen carbonate |
i dont understand