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30 gm of Mg and 30 gm of $ O_2 $ are reacted and the residual mixure contains

A. 60 gm of MgO only B. $ 40 gm of MgO and 20 gm of O_2 $ C. $ 45 gm of MgO and 15 gm of O_2 $ D. $ 50 gm of MgO and 10 gm of O_2 $

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Which of the following is not correct ?

A. $ 4LiNO_{3(s)} \rightarrow 2Li_2O(s) + 4NO_2(s) + O_2(g) $ B. $ 2NaNO_{3(s)} \rightarrow 2NaNO_{2(s)} + O_{2(g)} $ C. The oxides Li2O and MgO do not give super oxides by combining with more oxygen. D. Lithium hydrogen carbonate is obtained in solid form.

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Explanation

$ 2Mg + O_2 \rightarrow 2MgO $ $ 2 \times 24 32gm 2 \times 40gm $ $ 2 \times 24 gm 32gm 2 \times 40gm $ Here, $ 48 gm of Mg requires 32 gm of O_2 to form 80 gm MgO so, 30 gm of Mg requires 20 gm of O_2 to form 50 gm MgO so, 10 gm of O_2 $ is remain

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The number and type of bonds between two carbon atoms in calcium carbides are ...

A. one sigma, one pi. B. one sigma, two pi. C. two sigma, one pi. D. two sigma, two pi

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Which of the following salts are composed of isoelectronic cations and anions ?

A. NaCl B. $ MgF_2 $ C. CaS D. 2 & 3 Both

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Explanation

$ Ca^{2+} C ^ - \equiv C ^ - \rightarrow 1 \sigma and 2 \pi CaC_2 : Calcium Carbide $

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Which are correct statements for Be and Al ?

A. Both are rendered passive by $ con.HNO_3 $ B. Both have sp - hybridization in their compounds. C. Both form acidic oxides D. Both form hydrides

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Which of the following metal is used in the test of elements in organic compounds by Lassigne test ?

A. Li B. Na C. K D. Rb

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The setting time of dicalcium silicates is â€˜â€˜

A. 28 days B. 1 year C. 1 week D. 24 hour

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Assertion - Reason type Questions The questions given below contains statement - 1 (Assertion) and statement - 2 (Reason) Each question has four choices (a), (b),(c) and (d) out of which only one is correct. Choose the correct option as under. Statement-1 Alkali metals dissolve in ammonia to give blue solutions. Statement-2 Alkali metals in liquid ammonia give solvated species of the type $ [M(NH_3 )_X ]^+ $

A. Statement -1 is true, statement - 2 is true Statement - 2 is a correct explanation for statement - 1 B. Statement - 1 is true, statement - 2 is true; Statement - 2 is not a correct explanation for statement - 1 C. Statement - 1 is true, statement - 2 is false D. Statement - 1 is false, statement - 2 is true.

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Assertion - Reason type Questions The questions given below contains statement - 1 (Assertion) and statement - 2 (Reason) Each question has four choices (a), (b),(c) and (d) out of which only one is correct. Choose the correct option as under. Statement-1 Sodium metal is softer than potassium metal Statement-2 Metalic bonding in Potassium is weaker than inSodium.

A. Statement -1 is true, statement - 2 is true Statement - 2 is a correct explanation for statement - 2 B. Statement - 1 is true, statement - 2 is true; Statement - 2 is not a correct explanation for statement - 2 C. Statement - 1 is true, statement - 2 is false D. Statement - 1 is false, statement - 2 is true.

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Assertion - Reason type Questions The questions given below contains statement - 1 (Assertion) and statement - 2 (Reason) Each question has four choices (a), (b),(c) and (d) out of which only one is correct. Choose the correct option as under. Statement-1 $ Be(OH)_2 $ is solublein HCl and NaOH Statement-2 $ Be(OH)_2 $ is amphoteric in nature

A. Statement -1 is true, statement - 2 is true Statement - 2 is a correct explanation for statement - 3 B. Statement - 1 is true, statement - 2 is true; Statement - 2 is not a correct explanation for statement - 3 C. Statement - 1 is true, statement - 2 is false D. Statement - 1 is false, statement - 2 is true.

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