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अधोलिखितविषयानधिकृत्य पञ्चवाक्यात्मकमनुच्छेदं लिखत-
ग्राम्यजीवनम्।
Concept: undefined >> undefined
अधोलिखितविषयानधिकृत्य पञ्चवाक्यात्मकमनुच्छेदं लिखत-
जलसंरक्षणस्य उपाया:।
Concept: undefined >> undefined
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अधोलिखितविषयानधिकृत्य पञ्चवाक्यात्मकमनुच्छेदं लिखत-
विद्यालयस्य उन्नत्यै छात्राणां सहयोगः।
Concept: undefined >> undefined
अधोलिखितविषयानधिकृत्य पञ्चवाक्यात्मकमनुच्छेदं लिखत-
क्रीडाप्रतियोगिता ।
Concept: undefined >> undefined
मञ्जूषाप्रदत्तशब्दानां साहाय्येन निम्नलिखितं विषयम् अधिकृत्य न्यूनातिन्यूनं पञ्चभिः संस्कृतवाक्यैः एकम् अनुच्छेद लिखत -
“वायुप्रदूषणम्”
| मञ्जूषा - स्वास्थ्यम्, पर्यावरणस्य, रक्षकाः उद्योगानाम्, प्राणवायुम्, वृक्षारोपणम्, उपायाः, निर्माणकार्यम्, सहायकाः, वाहनानां धूम्रः, श्वासरोगाः। |
Concept: undefined >> undefined
निम्नलिखितं विषयमधिकृत्य मञ्जूषाप्रदत्तशब्दानां साहाय्येन न्यूनातिन्यूनं पञ्चभि: संस्कृतवाक्यै: एकम् अनुच्छेदं लिखत।
'मम प्रियं पुस्तकम्'
| मञ्जूषा - मम, पठेन, महती, ज्ञानस्य, साधनम्, भगवद्गीता, पुस्तकम्, प्रियम्, रुचिः, गीतायाम्, भण्डार:, कर्मयोगः, भक्तियोगः, अर्जुनम् प्रति, उपदेश:। |
Concept: undefined >> undefined
Why is sodium kept immersed in kerosene oil?
Concept: undefined >> undefined
Write equations for the reactions of iron with steam.
Concept: undefined >> undefined
Write equations for the reactions of calcium and potassium with water.
Concept: undefined >> undefined
Samples of four metals A, B, C and D were taken and added to the following solution one by one. The results obtained have been tabulated as follows.
| Metal | Iron (II) sulphate | Cooper (II) sulphate | Zinc sulphate | Silver nitrate |
| A | No reaction | Displacement | ||
| B | Displacement | No reaction | ||
| C | No reaction | No reaction | No reaction | Displacement |
| D | No reaction | No reaction | No reaction | No reaction |
Use the Table above to answer the following questions about metals A, B, C and D.
- Which is the most reactive metal?
- What would you observe if B is added to a solution of copper (II) sulphate?
- Arrange the metals A, B, C and D in the order of decreasing reactivity.
Concept: undefined >> undefined
Which gas is produced when dilute hydrochloric acid is added to a reactive metal?
Concept: undefined >> undefined
Write the chemical reaction when iron reacts with dilute H2SO4.
Concept: undefined >> undefined
What would you observe when zinc is added to a solution of iron (II) sulphate? Write the chemical reaction that takes place.
Concept: undefined >> undefined
Write the electron-dot structures for sodium, oxygen and magnesium.
Concept: undefined >> undefined
Show the formation of Na2O by the transfer of electrons.
Concept: undefined >> undefined
An element reacts with oxygen to give a compound with a high melting point. This compound is also soluble in water. The element is likely to be:
Concept: undefined >> undefined
Food cans are coated with tin and not with zinc because ______.
Concept: undefined >> undefined
You must have seen tarnished copper vessels being cleaned with lemon or tamarind juice. Explain why these sour substances are effective in cleaning the vessels.
Concept: undefined >> undefined
Differentiate between metal and non-metal on the basis of their chemical properties.
Concept: undefined >> undefined
Give reasons why copper is used to make hot water tanks and not steel (an alloy of iron).
Concept: undefined >> undefined
